gatsby
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Blazing fast modern site generator for React
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JavaScript
"use strict";
var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
exports.__esModule = true;
exports.default = _default;
var _platform2 = _interopRequireDefault(require("platform"));
var _css = _interopRequireDefault(require("css.escape"));
/* eslint-disable */
// Adapted from https://github.com/medialize/ally.js
// License: MIT
// Copyright (c) 2015 Rodney Rehm
//
// Entrypoint: ally.js/maintain/tab-focus
// input may be undefined, selector-tring, Node, NodeList, HTMLCollection, array of Nodes
// yes, to some extent this is a bad replica of jQuery's constructor function
function nodeArray(input) {
if (!input) {
return [];
}
if (Array.isArray(input)) {
return input;
}
// instanceof Node - does not work with iframes
if (input.nodeType !== undefined) {
return [input];
}
if (typeof input === 'string') {
input = document.querySelectorAll(input);
}
if (input.length !== undefined) {
return [].slice.call(input, 0);
}
throw new TypeError('unexpected input ' + String(input));
}
function contextToElement(_ref) {
var context = _ref.context,
_ref$label = _ref.label,
label = _ref$label === undefined ? 'context-to-element' : _ref$label,
resolveDocument = _ref.resolveDocument,
defaultToDocument = _ref.defaultToDocument;
var element = nodeArray(context)[0];
if (resolveDocument && element && element.nodeType === Node.DOCUMENT_NODE) {
element = element.documentElement;
}
if (!element && defaultToDocument) {
return document.documentElement;
}
if (!element) {
throw new TypeError(label + ' requires valid options.context');
}
if (element.nodeType !== Node.ELEMENT_NODE && element.nodeType !== Node.DOCUMENT_FRAGMENT_NODE) {
throw new TypeError(label + ' requires options.context to be an Element');
}
return element;
}
function getShadowHost() {
var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
context = _ref.context;
var element = contextToElement({
label: 'get/shadow-host',
context: context
});
// walk up to the root
var container = null;
while (element) {
container = element;
element = element.parentNode;
}
// https://developer.mozilla.org/en-US/docs/Web/API/Node.nodeType
// NOTE: Firefox 34 does not expose ShadowRoot.host (but 37 does)
if (container.nodeType === container.DOCUMENT_FRAGMENT_NODE && container.host) {
// the root is attached to a fragment node that has a host
return container.host;
}
return null;
}
function getDocument(node) {
if (!node) {
return document;
}
if (node.nodeType === Node.DOCUMENT_NODE) {
return node;
}
return node.ownerDocument || document;
}
function isActiveElement(context) {
var element = contextToElement({
label: 'is/active-element',
resolveDocument: true,
context: context
});
var _document = getDocument(element);
if (_document.activeElement === element) {
return true;
}
var shadowHost = getShadowHost({
context: element
});
if (shadowHost && shadowHost.shadowRoot.activeElement === element) {
return true;
}
return false;
}
// [elem, elem.parent, elem.parent.parent, …, html]
// will not contain the shadowRoot (DOCUMENT_FRAGMENT_NODE) and shadowHost
function getParents() {
var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
context = _ref.context;
var list = [];
var element = contextToElement({
label: 'get/parents',
context: context
});
while (element) {
list.push(element);
// IE does know support parentElement on SVGElement
element = element.parentNode;
if (element && element.nodeType !== Node.ELEMENT_NODE) {
element = null;
}
}
return list;
}
// Element.prototype.matches may be available at a different name
// https://developer.mozilla.org/en/docs/Web/API/Element/matches
var names = ['matches', 'webkitMatchesSelector', 'mozMatchesSelector', 'msMatchesSelector'];
var name = null;
function findMethodName(element) {
names.some(function (_name) {
if (!element[_name]) {
return false;
}
name = _name;
return true;
});
}
function elementMatches(element, selector) {
if (!name) {
findMethodName(element);
}
return element[name](selector);
}
// deep clone of original platform
var platform = JSON.parse(JSON.stringify(_platform2.default));
// operating system
var os = platform.os.family || '';
var ANDROID = os === 'Android';
var WINDOWS = os.slice(0, 7) === 'Windows';
var OSX = os === 'OS X';
var IOS = os === 'iOS';
// layout
var BLINK = platform.layout === 'Blink';
var GECKO = platform.layout === 'Gecko';
var TRIDENT = platform.layout === 'Trident';
var EDGE = platform.layout === 'EdgeHTML';
var WEBKIT = platform.layout === 'WebKit';
// browser version (not layout engine version!)
var version = parseFloat(platform.version);
var majorVersion = Math.floor(version);
platform.majorVersion = majorVersion;
platform.is = {
// operating system
ANDROID: ANDROID,
WINDOWS: WINDOWS,
OSX: OSX,
IOS: IOS,
// layout
BLINK: BLINK,
// "Chrome", "Chrome Mobile", "Opera"
GECKO: GECKO,
// "Firefox"
TRIDENT: TRIDENT,
// "Internet Explorer"
EDGE: EDGE,
// "Microsoft Edge"
WEBKIT: WEBKIT,
// "Safari"
// INTERNET EXPLORERS
IE9: TRIDENT && majorVersion === 9,
IE10: TRIDENT && majorVersion === 10,
IE11: TRIDENT && majorVersion === 11
};
function before() {
var data = {
// remember what had focus to restore after test
activeElement: document.activeElement,
// remember scroll positions to restore after test
windowScrollTop: window.scrollTop,
windowScrollLeft: window.scrollLeft,
bodyScrollTop: document.body.scrollTop,
bodyScrollLeft: document.body.scrollLeft
};
// wrap tests in an element hidden from screen readers to prevent them
// from announcing focus, which can be quite irritating to the user
var iframe = document.createElement('iframe');
iframe.setAttribute('style', 'position:absolute; position:fixed; top:0; left:-2px; width:1px; height:1px; overflow:hidden;');
iframe.setAttribute('aria-live', 'off');
iframe.setAttribute('aria-busy', 'true');
iframe.setAttribute('aria-hidden', 'true');
document.body.appendChild(iframe);
var _window = iframe.contentWindow;
var _document = _window.document;
_document.open();
_document.close();
var wrapper = _document.createElement('div');
_document.body.appendChild(wrapper);
data.iframe = iframe;
data.wrapper = wrapper;
data.window = _window;
data.document = _document;
return data;
}
// options.element:
// {string} element name
// {function} callback(wrapper, document) to generate an element
// options.mutate: (optional)
// {function} callback(element, wrapper, document) to manipulate element prior to focus-test.
// Can return DOMElement to define focus target (default: element)
// options.validate: (optional)
// {function} callback(element, focusTarget, document) to manipulate test-result
function test(data, options) {
// make sure we operate on a clean slate
data.wrapper.innerHTML = '';
// create dummy element to test focusability of
var element = typeof options.element === 'string' ? data.document.createElement(options.element) : options.element(data.wrapper, data.document);
// allow callback to further specify dummy element
// and optionally define element to focus
var focus = options.mutate && options.mutate(element, data.wrapper, data.document);
if (!focus && focus !== false) {
focus = element;
}
// element needs to be part of the DOM to be focusable
!element.parentNode && data.wrapper.appendChild(element);
// test if the element with invalid tabindex can be focused
focus && focus.focus && focus.focus();
// validate test's result
return options.validate ? options.validate(element, focus, data.document) : data.document.activeElement === focus;
}
function after(data) {
// restore focus to what it was before test and cleanup
if (data.activeElement === document.body) {
document.activeElement && document.activeElement.blur && document.activeElement.blur();
if (platform.is.IE10) {
// IE10 does not redirect focus to <body> when the activeElement is removed
document.body.focus();
}
} else {
data.activeElement && data.activeElement.focus && data.activeElement.focus();
}
document.body.removeChild(data.iframe);
// restore scroll position
window.scrollTop = data.windowScrollTop;
window.scrollLeft = data.windowScrollLeft;
document.body.scrollTop = data.bodyScrollTop;
document.body.scrollLeft = data.bodyScrollLeft;
}
function detectFocus(tests) {
var data = before();
var results = {};
Object.keys(tests).map(function (key) {
results[key] = test(data, tests[key]);
});
after(data);
return results;
}
// this file is overwritten by `npm run build:pre`
var version$1 = '1.4.1';
/*
Facility to cache test results in localStorage.
USAGE:
cache.get('key');
cache.set('key', 'value');
*/
function readLocalStorage(key) {
// allow reading from storage to retrieve previous support results
// even while the document does not have focus
var data = void 0;
try {
data = window.localStorage && window.localStorage.getItem(key);
data = data ? JSON.parse(data) : {};
} catch (e) {
data = {};
}
return data;
}
function writeLocalStorage(key, value) {
if (!document.hasFocus()) {
// if the document does not have focus when tests are executed, focus() may
// not be handled properly and events may not be dispatched immediately.
// This can happen when a document is reloaded while Developer Tools have focus.
try {
window.localStorage && window.localStorage.removeItem(key);
} catch (e) {
// ignore
}
return;
}
try {
window.localStorage && window.localStorage.setItem(key, JSON.stringify(value));
} catch (e) {
// ignore
}
}
var userAgent = typeof window !== 'undefined' && window.navigator.userAgent || '';
var cacheKey = 'ally-supports-cache';
var cache = readLocalStorage(cacheKey);
// update the cache if ally or the user agent changed (newer version, etc)
if (cache.userAgent !== userAgent || cache.version !== version$1) {
cache = {};
}
cache.userAgent = userAgent;
cache.version = version$1;
var cache$1 = {
get: function get() {
return cache;
},
set: function set(values) {
Object.keys(values).forEach(function (key) {
cache[key] = values[key];
});
cache.time = new Date().toISOString();
writeLocalStorage(cacheKey, cache);
}
};
function cssShadowPiercingDeepCombinator() {
var combinator = void 0;
// see https://dev.w3.org/csswg/css-scoping-1/#deep-combinator
// https://bugzilla.mozilla.org/show_bug.cgi?id=1117572
// https://code.google.com/p/chromium/issues/detail?id=446051
try {
document.querySelector('html >>> :first-child');
combinator = '>>>';
} catch (noArrowArrowArrow) {
try {
// old syntax supported at least up to Chrome 41
// https://code.google.com/p/chromium/issues/detail?id=446051
document.querySelector('html /deep/ :first-child');
combinator = '/deep/';
} catch (noDeep) {
combinator = '';
}
}
return combinator;
}
var gif = 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7';
// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#attr-usemap
var focusAreaImgTabindex = {
element: 'div',
mutate: function mutate(element) {
element.innerHTML = '<map name="image-map-tabindex-test">' + '<area shape="rect" coords="63,19,144,45"></map>' + '<img usemap="#image-map-tabindex-test" tabindex="-1" alt="" src="' + gif + '">';
return element.querySelector('area');
}
};
// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#attr-usemap
var focusAreaTabindex = {
element: 'div',
mutate: function mutate(element) {
element.innerHTML = '<map name="image-map-tabindex-test">' + '<area href="#void" tabindex="-1" shape="rect" coords="63,19,144,45"></map>' + '<img usemap="#image-map-tabindex-test" alt="" src="' + gif + '">';
return false;
},
validate: function validate(element, focusTarget, _document) {
if (platform.is.GECKO) {
// fixes https://github.com/medialize/ally.js/issues/35
// Firefox loads the DataURI asynchronously, causing a false-negative
return true;
}
var focus = element.querySelector('area');
focus.focus();
return _document.activeElement === focus;
}
};
// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#attr-usemap
var focusAreaWithoutHref = {
element: 'div',
mutate: function mutate(element) {
element.innerHTML = '<map name="image-map-area-href-test">' + '<area shape="rect" coords="63,19,144,45"></map>' + '<img usemap="#image-map-area-href-test" alt="" src="' + gif + '">';
return element.querySelector('area');
},
validate: function validate(element, focusTarget, _document) {
if (platform.is.GECKO) {
// fixes https://github.com/medialize/ally.js/issues/35
// Firefox loads the DataURI asynchronously, causing a false-negative
return true;
}
return _document.activeElement === focusTarget;
}
};
var focusAudioWithoutControls = {
name: 'can-focus-audio-without-controls',
element: 'audio',
mutate: function mutate(element) {
try {
// invalid media file can trigger warning in console, data-uri to prevent HTTP request
element.setAttribute('src', gif);
} catch (e) {
// IE9 may throw "Error: Not implemented"
}
}
};
var invalidGif = 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ';
// NOTE: https://github.com/medialize/ally.js/issues/35
// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#attr-usemap
var focusBrokenImageMap = {
element: 'div',
mutate: function mutate(element) {
element.innerHTML = '<map name="broken-image-map-test"><area href="#void" shape="rect" coords="63,19,144,45"></map>' + '<img usemap="#broken-image-map-test" alt="" src="' + invalidGif + '">';
return element.querySelector('area');
}
};
// Children of focusable elements with display:flex are focusable in IE10-11
var focusChildrenOfFocusableFlexbox = {
element: 'div',
mutate: function mutate(element) {
element.setAttribute('tabindex', '-1');
element.setAttribute('style', 'display: -webkit-flex; display: -ms-flexbox; display: flex;');
element.innerHTML = '<span style="display: block;">hello</span>';
return element.querySelector('span');
}
};
// fieldset[tabindex=0][disabled] should not be focusable, but Blink and WebKit disagree
// @specification https://www.w3.org/TR/html5/disabled-elements.html#concept-element-disabled
// @browser-issue Chromium https://crbug.com/453847
// @browser-issue WebKit https://bugs.webkit.org/show_bug.cgi?id=141086
var focusFieldsetDisabled = {
element: 'fieldset',
mutate: function mutate(element) {
element.setAttribute('tabindex', 0);
element.setAttribute('disabled', 'disabled');
}
};
var focusFieldset = {
element: 'fieldset',
mutate: function mutate(element) {
element.innerHTML = '<legend>legend</legend><p>content</p>';
}
};
// elements with display:flex are focusable in IE10-11
var focusFlexboxContainer = {
element: 'span',
mutate: function mutate(element) {
element.setAttribute('style', 'display: -webkit-flex; display: -ms-flexbox; display: flex;');
element.innerHTML = '<span style="display: block;">hello</span>';
}
};
// form[tabindex=0][disabled] should be focusable as the
// specification doesn't know the disabled attribute on the form element
// @specification https://www.w3.org/TR/html5/forms.html#the-form-element
var focusFormDisabled = {
element: 'form',
mutate: function mutate(element) {
element.setAttribute('tabindex', 0);
element.setAttribute('disabled', 'disabled');
}
};
// NOTE: https://github.com/medialize/ally.js/issues/35
// fixes https://github.com/medialize/ally.js/issues/20
// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#attr-ismap
var focusImgIsmap = {
element: 'a',
mutate: function mutate(element) {
element.href = '#void';
element.innerHTML = '<img ismap src="' + gif + '" alt="">';
return element.querySelector('img');
}
};
// NOTE: https://github.com/medialize/ally.js/issues/35
// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#attr-usemap
var focusImgUsemapTabindex = {
element: 'div',
mutate: function mutate(element) {
element.innerHTML = '<map name="image-map-tabindex-test"><area href="#void" shape="rect" coords="63,19,144,45"></map>' + '<img usemap="#image-map-tabindex-test" tabindex="-1" alt="" ' + 'src="' + gif + '">';
return element.querySelector('img');
}
};
var focusInHiddenIframe = {
element: function element(wrapper, _document) {
var iframe = _document.createElement('iframe');
// iframe must be part of the DOM before accessing the contentWindow is possible
wrapper.appendChild(iframe);
// create the iframe's default document (<html><head></head><body></body></html>)
var iframeDocument = iframe.contentWindow.document;
iframeDocument.open();
iframeDocument.close();
return iframe;
},
mutate: function mutate(iframe) {
iframe.style.visibility = 'hidden';
var iframeDocument = iframe.contentWindow.document;
var input = iframeDocument.createElement('input');
iframeDocument.body.appendChild(input);
return input;
},
validate: function validate(iframe) {
var iframeDocument = iframe.contentWindow.document;
var focus = iframeDocument.querySelector('input');
return iframeDocument.activeElement === focus;
}
};
var result = !platform.is.WEBKIT;
function focusInZeroDimensionObject() {
return result;
}
// Firefox allows *any* value and treats invalid values like tabindex="-1"
// @browser-issue Gecko https://bugzilla.mozilla.org/show_bug.cgi?id=1128054
var focusInvalidTabindex = {
element: 'div',
mutate: function mutate(element) {
element.setAttribute('tabindex', 'invalid-value');
}
};
var focusLabelTabindex = {
element: 'label',
mutate: function mutate(element) {
element.setAttribute('tabindex', '-1');
},
validate: function validate(element, focusTarget, _document) {
// force layout in Chrome 49, otherwise the element won't be focusable
/* eslint-disable no-unused-vars */
var variableToPreventDeadCodeElimination = element.offsetHeight;
/* eslint-enable no-unused-vars */
element.focus();
return _document.activeElement === element;
}
};
var svg = 'data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHhtb' + 'G5zOnhsaW5rPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hsaW5rIiBpZD0ic3ZnIj48dGV4dCB4PSIxMCIgeT0iMjAiIGlkPSJ' + 'zdmctbGluay10ZXh0Ij50ZXh0PC90ZXh0Pjwvc3ZnPg==';
// Note: IE10 on BrowserStack does not like this test
var focusObjectSvgHidden = {
element: 'object',
mutate: function mutate(element) {
element.setAttribute('type', 'image/svg+xml');
element.setAttribute('data', svg);
element.setAttribute('width', '200');
element.setAttribute('height', '50');
element.style.visibility = 'hidden';
}
};
// Note: IE10 on BrowserStack does not like this test
var focusObjectSvg = {
name: 'can-focus-object-svg',
element: 'object',
mutate: function mutate(element) {
element.setAttribute('type', 'image/svg+xml');
element.setAttribute('data', svg);
element.setAttribute('width', '200');
element.setAttribute('height', '50');
},
validate: function validate(element, focusTarget, _document) {
if (platform.is.GECKO) {
// Firefox seems to be handling the object creation asynchronously and thereby produces a false negative test result.
// Because we know Firefox is able to focus object elements referencing SVGs, we simply cheat by sniffing the user agent string
return true;
}
return _document.activeElement === element;
}
};
// Every Environment except IE9 considers SWF objects focusable
var result$1 = !platform.is.IE9;
function focusObjectSwf() {
return result$1;
}
var focusRedirectImgUsemap = {
element: 'div',
mutate: function mutate(element) {
element.innerHTML = '<map name="focus-redirect-img-usemap"><area href="#void" shape="rect" coords="63,19,144,45"></map>' + '<img usemap="#focus-redirect-img-usemap" alt="" ' + 'src="' + gif + '">';
// focus the <img>, not the <div>
return element.querySelector('img');
},
validate: function validate(element, focusTarget, _document) {
var target = element.querySelector('area');
return _document.activeElement === target;
}
};
// see https://jsbin.com/nenirisage/edit?html,js,console,output
var focusRedirectLegend = {
element: 'fieldset',
mutate: function mutate(element) {
element.innerHTML = '<legend>legend</legend><input tabindex="-1"><input tabindex="0">';
// take care of focus in validate();
return false;
},
validate: function validate(element, focusTarget, _document) {
var focusable = element.querySelector('input[tabindex="-1"]');
var tabbable = element.querySelector('input[tabindex="0"]');
// Firefox requires this test to focus the <fieldset> first, while this is not necessary in
// https://jsbin.com/nenirisage/edit?html,js,console,output
element.focus();
element.querySelector('legend').focus();
return _document.activeElement === focusable && 'focusable' || _document.activeElement === tabbable && 'tabbable' || '';
}
};
// https://github.com/medialize/ally.js/issues/21
var focusScrollBody = {
element: 'div',
mutate: function mutate(element) {
element.setAttribute('style', 'width: 100px; height: 50px; overflow: auto;');
element.innerHTML = '<div style="width: 500px; height: 40px;">scrollable content</div>';
return element.querySelector('div');
}
};
// https://github.com/medialize/ally.js/issues/21
var focusScrollContainerWithoutOverflow = {
element: 'div',
mutate: function mutate(element) {
element.setAttribute('style', 'width: 100px; height: 50px;');
element.innerHTML = '<div style="width: 500px; height: 40px;">scrollable content</div>';
}
};
// https://github.com/medialize/ally.js/issues/21
var focusScrollContainer = {
element: 'div',
mutate: function mutate(element) {
element.setAttribute('style', 'width: 100px; height: 50px; overflow: auto;');
element.innerHTML = '<div style="width: 500px; height: 40px;">scrollable content</div>';
}
};
var focusSummary = {
element: 'details',
mutate: function mutate(element) {
element.innerHTML = '<summary>foo</summary><p>content</p>';
return element.firstElementChild;
}
};
function makeFocusableForeignObject() {
var fragment = document.createElement('div');
fragment.innerHTML = '<svg><foreignObject width="30" height="30">\n <input type="text"/>\n </foreignObject></svg>';
return fragment.firstChild.firstChild;
}
function focusSvgForeignObjectHack(element) {
// Edge13, Edge14: foreignObject focus hack
// https://jsbin.com/kunehinugi/edit?html,js,output
// https://jsbin.com/fajagi/3/edit?html,js,output
var isSvgElement = element.ownerSVGElement || element.nodeName.toLowerCase() === 'svg';
if (!isSvgElement) {
return false;
}
// inject and focus an <input> element into the SVG element to receive focus
var foreignObject = makeFocusableForeignObject();
element.appendChild(foreignObject);
var input = foreignObject.querySelector('input');
input.focus();
// upon disabling the activeElement, IE and Edge
// will not shift focus to <body> like all the other
// browsers, but instead find the first focusable
// ancestor and shift focus to that
input.disabled = true;
// clean up
element.removeChild(foreignObject);
return true;
}
function generate(element) {
return '<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">' + element + '</svg>';
}
function focus(element) {
if (element.focus) {
return;
}
try {
HTMLElement.prototype.focus.call(element);
} catch (e) {
focusSvgForeignObjectHack(element);
}
}
function validate(element, focusTarget, _document) {
focus(focusTarget);
return _document.activeElement === focusTarget;
}
var focusSvgFocusableAttribute = {
element: 'div',
mutate: function mutate(element) {
element.innerHTML = generate('<text focusable="true">a</text>');
return element.querySelector('text');
},
validate: validate
};
var focusSvgTabindexAttribute = {
element: 'div',
mutate: function mutate(element) {
element.innerHTML = generate('<text tabindex="0">a</text>');
return element.querySelector('text');
},
validate: validate
};
var focusSvgNegativeTabindexAttribute = {
element: 'div',
mutate: function mutate(element) {
element.innerHTML = generate('<text tabindex="-1">a</text>');
return element.querySelector('text');
},
validate: validate
};
var focusSvgUseTabindex = {
element: 'div',
mutate: function mutate(element) {
element.innerHTML = generate(['<g id="ally-test-target"><a xlink:href="#void"><text>link</text></a></g>', '<use xlink:href="#ally-test-target" x="0" y="0" tabindex="-1" />'].join(''));
return element.querySelector('use');
},
validate: validate
};
var focusSvgForeignobjectTabindex = {
element: 'div',
mutate: function mutate(element) {
element.innerHTML = generate('<foreignObject tabindex="-1"><input type="text" /></foreignObject>');
// Safari 8's quersSelector() can't identify foreignObject, but getElementyByTagName() can
return element.querySelector('foreignObject') || element.getElementsByTagName('foreignObject')[0];
},
validate: validate
};
// Firefox seems to be handling the SVG-document-in-iframe creation asynchronously
// and thereby produces a false negative test result. Thus the test is pointless
// and we resort to UA sniffing once again.
// see http://jsbin.com/vunadohoko/1/edit?js,console,output
var result$2 = Boolean(platform.is.GECKO && typeof SVGElement !== 'undefined' && SVGElement.prototype.focus);
function focusSvgInIframe() {
return result$2;
}
var focusSvg = {
element: 'div',
mutate: function mutate(element) {
element.innerHTML = generate('');
return element.firstChild;
},
validate: validate
};
// Firefox allows *any* value and treats invalid values like tabindex="-1"
// @browser-issue Gecko https://bugzilla.mozilla.org/show_bug.cgi?id=1128054
var focusTabindexTrailingCharacters = {
element: 'div',
mutate: function mutate(element) {
element.setAttribute('tabindex', '3x');
}
};
var focusTable = {
element: 'table',
mutate: function mutate(element, wrapper, _document) {
// IE9 has a problem replacing TBODY contents with innerHTML.
// https://stackoverflow.com/a/8097055/515124
// element.innerHTML = '<tr><td>cell</td></tr>';
var fragment = _document.createDocumentFragment();
fragment.innerHTML = '<tr><td>cell</td></tr>';
element.appendChild(fragment);
}
};
var focusVideoWithoutControls = {
element: 'video',
mutate: function mutate(element) {
try {
// invalid media file can trigger warning in console, data-uri to prevent HTTP request
element.setAttribute('src', gif);
} catch (e) {
// IE9 may throw "Error: Not implemented"
}
}
};
// https://jsbin.com/vafaba/3/edit?html,js,console,output
var result$3 = platform.is.GECKO || platform.is.TRIDENT || platform.is.EDGE;
function tabsequenceAreaAtImgPosition() {
return result$3;
}
var testCallbacks = {
cssShadowPiercingDeepCombinator: cssShadowPiercingDeepCombinator,
focusInZeroDimensionObject: focusInZeroDimensionObject,
focusObjectSwf: focusObjectSwf,
focusSvgInIframe: focusSvgInIframe,
tabsequenceAreaAtImgPosition: tabsequenceAreaAtImgPosition
};
var testDescriptions = {
focusAreaImgTabindex: focusAreaImgTabindex,
focusAreaTabindex: focusAreaTabindex,
focusAreaWithoutHref: focusAreaWithoutHref,
focusAudioWithoutControls: focusAudioWithoutControls,
focusBrokenImageMap: focusBrokenImageMap,
focusChildrenOfFocusableFlexbox: focusChildrenOfFocusableFlexbox,
focusFieldsetDisabled: focusFieldsetDisabled,
focusFieldset: focusFieldset,
focusFlexboxContainer: focusFlexboxContainer,
focusFormDisabled: focusFormDisabled,
focusImgIsmap: focusImgIsmap,
focusImgUsemapTabindex: focusImgUsemapTabindex,
focusInHiddenIframe: focusInHiddenIframe,
focusInvalidTabindex: focusInvalidTabindex,
focusLabelTabindex: focusLabelTabindex,
focusObjectSvg: focusObjectSvg,
focusObjectSvgHidden: focusObjectSvgHidden,
focusRedirectImgUsemap: focusRedirectImgUsemap,
focusRedirectLegend: focusRedirectLegend,
focusScrollBody: focusScrollBody,
focusScrollContainerWithoutOverflow: focusScrollContainerWithoutOverflow,
focusScrollContainer: focusScrollContainer,
focusSummary: focusSummary,
focusSvgFocusableAttribute: focusSvgFocusableAttribute,
focusSvgTabindexAttribute: focusSvgTabindexAttribute,
focusSvgNegativeTabindexAttribute: focusSvgNegativeTabindexAttribute,
focusSvgUseTabindex: focusSvgUseTabindex,
focusSvgForeignobjectTabindex: focusSvgForeignobjectTabindex,
focusSvg: focusSvg,
focusTabindexTrailingCharacters: focusTabindexTrailingCharacters,
focusTable: focusTable,
focusVideoWithoutControls: focusVideoWithoutControls
};
function executeTests() {
var results = detectFocus(testDescriptions);
Object.keys(testCallbacks).forEach(function (key) {
results[key] = testCallbacks[key]();
});
return results;
}
var supportsCache = null;
function _supports() {
if (supportsCache) {
return supportsCache;
}
supportsCache = cache$1.get();
if (!supportsCache.time) {
cache$1.set(executeTests());
supportsCache = cache$1.get();
}
return supportsCache;
}
var supports = void 0;
// https://www.w3.org/TR/html5/infrastructure.html#rules-for-parsing-integers
// NOTE: all browsers agree to allow trailing spaces as well
var validIntegerPatternNoTrailing = /^\s*(-|\+)?[0-9]+\s*$/;
var validIntegerPatternWithTrailing = /^\s*(-|\+)?[0-9]+.*$/;
function isValidTabindex(context) {
if (!supports) {
supports = _supports();
}
var validIntegerPattern = supports.focusTabindexTrailingCharacters ? validIntegerPatternWithTrailing : validIntegerPatternNoTrailing;
var element = contextToElement({
label: 'is/valid-tabindex',
resolveDocument: true,
context: context
});
// Edge 14 has a capitalization problem on SVG elements,
// see https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/9282058/
var hasTabindex = element.hasAttribute('tabindex');
var hasTabIndex = element.hasAttribute('tabIndex');
if (!hasTabindex && !hasTabIndex) {
return false;
}
// older Firefox and Internet Explorer don't support tabindex on SVG elements
var isSvgElement = element.ownerSVGElement || element.nodeName.toLowerCase() === 'svg';
if (isSvgElement && !supports.focusSvgTabindexAttribute) {
return false;
}
// @browser-issue Gecko https://bugzilla.mozilla.org/show_bug.cgi?id=1128054
if (supports.focusInvalidTabindex) {
return true;
}
// an element matches the tabindex selector even if its value is invalid
var tabindex = element.getAttribute(hasTabindex ? 'tabindex' : 'tabIndex');
// IE11 parses tabindex="" as the value "-32768"
// @browser-issue Trident https://connect.microsoft.com/IE/feedback/details/1072965
if (tabindex === '-32768') {
return false;
}
return Boolean(tabindex && validIntegerPattern.test(tabindex));
}
function tabindexValue(element) {
if (!isValidTabindex(element)) {
return null;
}
// Edge 14 has a capitalization problem on SVG elements,
// see https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/9282058/
var hasTabindex = element.hasAttribute('tabindex');
var attributeName = hasTabindex ? 'tabindex' : 'tabIndex';
// @browser-issue Gecko https://bugzilla.mozilla.org/show_bug.cgi?id=1128054
var tabindex = parseInt(element.getAttribute(attributeName), 10);
return isNaN(tabindex) ? -1 : tabindex;
}
// this is a shared utility file for focus-relevant.js and tabbable.js
// separate testing of this file's functions is not necessary,
// as they're implicitly tested by way of the consumers
function isUserModifyWritable(style) {
// https://www.w3.org/TR/1999/WD-css3-userint-19990916#user-modify
// https://github.com/medialize/ally.js/issues/17
var userModify = style.webkitUserModify || '';
return Boolean(userModify && userModify.indexOf('write') !== -1);
}
function hasCssOverflowScroll(style) {
return [style.getPropertyValue('overflow'), style.getPropertyValue('overflow-x'), style.getPropertyValue('overflow-y')].some(function (overflow) {
return overflow === 'auto' || overflow === 'scroll';
});
}
function hasCssDisplayFlex(style) {
return style.display.indexOf('flex') > -1;
}
function isScrollableContainer(element, nodeName, parentNodeName, parentStyle) {
if (nodeName !== 'div' && nodeName !== 'span') {
// Internet Explorer advances scrollable containers and bodies to focusable
// only if the scrollable container is <div> or <span> - this does *not*
// happen for <section>, <article>, …
return false;
}
if (parentNodeName && parentNodeName !== 'div' && parentNodeName !== 'span' && !hasCssOverflowScroll(parentStyle)) {
return false;
}
return element.offsetHeight < element.scrollHeight || element.offsetWidth < element.scrollWidth;
}
var supports$1 = void 0;
function isFocusRelevantRules() {
var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
context = _ref.context,
_ref$except = _ref.except,
except = _ref$except === undefined ? {
flexbox: false,
scrollable: false,
shadow: false
} : _ref$except;
if (!supports$1) {
supports$1 = _supports();
}
var element = contextToElement({
label: 'is/focus-relevant',
resolveDocument: true,
context: context
});
if (!except.shadow && element.shadowRoot) {
// a ShadowDOM host receives focus when the focus moves to its content
return true;
}
var nodeName = element.nodeName.toLowerCase();
if (nodeName === 'input' && element.type === 'hidden') {
// input[type="hidden"] supports.cannot be focused
return false;
}
if (nodeName === 'input' || nodeName === 'select' || nodeName === 'button' || nodeName === 'textarea') {
return true;
}
if (nodeName === 'legend' && supports$1.focusRedirectLegend) {
// specifics filtered in is/focusable
return true;
}
if (nodeName === 'label') {
// specifics filtered in is/focusable
return true;
}
if (nodeName === 'area') {
// specifics filtered in is/focusable
return true;
}
if (nodeName === 'a' && element.hasAttribute('href')) {
return true;
}
if (nodeName === 'object' && element.hasAttribute('usemap')) {
// object[usemap] is not focusable in any browser
return false;
}
if (nodeName === 'object') {
var svgType = element.getAttribute('type');
if (!supports$1.focusObjectSvg && svgType === 'image/svg+xml') {
// object[type="image/svg+xml"] is not focusable in Internet Explorer
return false;
} else if (!supports$1.focusObjectSwf && svgType === 'application/x-shockwave-flash') {
// object[type="application/x-shockwave-flash"] is not focusable in Internet Explorer 9
return false;
}
}
if (nodeName === 'iframe' || nodeName === 'object') {
// browsing context containers
return true;
}
if (nodeName === 'embed' || nodeName === 'keygen') {
// embed is considered focus-relevant but not focusable
// see https://github.com/medialize/ally.js/issues/82
return true;
}
if (element.hasAttribute('contenteditable')) {
// also see CSS property user-modify below
return true;
}
if (nodeName === 'audio' && (supports$1.focusAudioWithoutControls || element.hasAttribute('controls'))) {
return true;
}
if (nodeName === 'video' && (supports$1.focusVideoWithoutControls || element.hasAttribute('controls'))) {
return true;
}
if (supports$1.focusSummary && nodeName === 'summary') {
return true;
}
var validTabindex = isValidTabindex(element);
if (nodeName === 'img' && element.hasAttribute('usemap')) {
// Gecko, Trident and Edge do not allow an image with an image map and tabindex to be focused,
// it appears the tabindex is overruled so focus is still forwarded to the <map>
return validTabindex && supports$1.focusImgUsemapTabindex || supports$1.focusRedirectImgUsemap;
}
if (supports$1.focusTable && (nodeName === 'table' || nodeName === 'td')) {
// IE10-11 supports.can focus <table> and <td>
return true;
}
if (supports$1.focusFieldset && nodeName === 'fieldset') {
// IE10-11 supports.can focus <fieldset>
return true;
}
var isSvgElement = nodeName === 'svg';
var isSvgContent = element.ownerSVGElement;
var focusableAttribute = element.getAttribute('focusable');
var tabindex = tabindexValue(element);
if (nodeName === 'use' && tabindex !== null && !supports$1.focusSvgUseTabindex) {
// <use> cannot be made focusable by adding a tabindex attribute anywhere but Blink and WebKit
return false;
}
if (nodeName === 'foreignobject') {
// <use> can only be made focusable in Blink and WebKit
return tabindex !== null && supports$1.focusSvgForeignobjectTabindex;
}
if (elementMatches(element, 'svg a') && element.hasAttribute('xlink:href')) {
return true;
}
if ((isSvgElement || isSvgContent) && element.focus && !supports$1.focusSvgNegativeTabindexAttribute && tabindex < 0) {
// Firefox 51 and 52 treat any natively tabbable SVG element with
// tabindex="-1" as tabbable and everything else as inert
// see https://bugzilla.mozilla.org/show_bug.cgi?id=1302340
return false;
}
if (isSvgElement) {
return validTabindex || supports$1.focusSvg || supports$1.focusSvgInIframe ||
// Internet Explorer understands the focusable attribute introduced in SVG Tiny 1.2
Boolean(supports$1.focusSvgFocusableAttribute && focusableAttribute && focusableAttribute === 'true');
}
if (isSvgContent) {
if (supports$1.focusSvgTabindexAttribute && validTabindex) {
return true;
}
if (supports$1.focusSvgFocusableAttribute) {
// Internet Explorer understands the focusable attribute introduced in SVG Tiny 1.2
return focusableAttribute === 'true';
}
}
// https://www.w3.org/TR/html5/editing.html#sequential-focus-navigation-and-the-tabindex-attribute
if (validTabindex) {
return true;
}
var style = window.getComputedStyle(element, null);
if (isUserModifyWritable(style)) {
return true;
}
if (supports$1.focusImgIsmap && nodeName === 'img' && element.hasAttribute('ismap')) {
// IE10-11 considers the <img> in <a href><img ismap> focusable
// https://github.com/medialize/ally.js/issues/20
var hasLinkParent = getParents({
context: element
}).some(function (parent) {
return parent.nodeName.toLowerCase() === 'a' && parent.hasAttribute('href');
});
if (hasLinkParent) {
return true;
}
}
// https://github.com/medialize/ally.js/issues/21
if (!except.scrollable && supports$1.focusScrollContainer) {
if (supports$1.focusScrollContainerWithoutOverflow) {
// Internet Explorer does will consider the scrollable area focusable
// if the element is a <div> or a <span> and it is in fact scrollable,
// regardless of the CSS overflow property
if (isScrollableContainer(element, nodeName)) {
return true;
}
} else if (hasCssOverflowScroll(style)) {
// Firefox requires proper overflow setting, IE does not necessarily
// https://developer.mozilla.org/en-US/docs/Web/CSS/overflow
return true;
}
}
if (!except.flexbox && supports$1.focusFlexboxContainer && hasCssDisplayFlex(style)) {
// elements with display:flex are focusable in IE10-11
return true;
}
var parent = element.parentElement;
if (!except.scrollable && parent) {
var parentNodeName = parent.nodeName.toLowerCase();
var parentStyle = window.getComputedStyle(parent, null);
if (supports$1.focusScrollBody && isScrollableContainer(parent, nodeName, parentNodeName, parentStyle)) {
// scrollable bodies are focusable Internet Explorer
// https://github.com/medialize/ally.js/issues/21
return true;
}
// Children of focusable elements with display:flex are focusable in IE10-11
if (supports$1.focusChildrenOfFocusableFlexbox) {
if (hasCssDisplayFlex(parentStyle)) {
return true;
}
}
}
// NOTE: elements marked as inert are not focusable,
// but that property is not exposed to the DOM
// https://www.w3.org/TR/html5/editing.html#inert
return false;
}
// bind exceptions to an iterator callback
isFocusRelevantRules.except = function () {
var except = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
var isFocusRelevant = function isFocusRelevant(context) {
return isFocusRelevantRules({
context: context,
except: except
});
};
isFocusRelevant.rules = isFocusRelevantRules;
return isFocusRelevant;
};
// provide isFocusRelevant(context) as default iterator callback
var isFocusRelevant = isFocusRelevantRules.except({});
function findIndex(array, callback) {
// attempt to use native or polyfilled Array#findIndex first
if (array.findIndex) {
return array.findIndex(callback);
}
var length = array.length;
// shortcut if the array is empty
if (length === 0) {
return -1;
}
// otherwise loop over array
for (var i = 0; i < length; i++) {
if (callback(array[i], i, array)) {
return i;
}
}
return -1;
}
function getContentDocument(node) {
try {
// works on <object> and <iframe>
return node.contentDocument ||
// works on <object> and <iframe>
node.contentWindow && node.contentWindow.document ||
// works on <object> and <iframe> that contain SVG
node.getSVGDocument && node.getSVGDocument() || null;
} catch (e) {
// SecurityError: Failed to read the 'contentDocument' property from 'HTMLObjectElement'
// also IE may throw member not found exception e.g. on <object type="image/png">
return null;
}
}
function getWindow(node) {
var _document = getDocument(node);
return _document.defaultView || window;
}
var shadowPrefix = void 0;
function selectInShadows(selector) {
if (typeof shadowPrefix !== 'string') {
var operator = cssShadowPiercingDeepCombinator();
if (operator) {
shadowPrefix = ', html ' + operator + ' ';
}
}
if (!shadowPrefix) {
return selector;
}
return selector + shadowPrefix + selector.replace(/\s*,\s*/g, ',').split(',').join(shadowPrefix);
}
var selector = void 0;
function findDocumentHostElement(_window) {
if (!selector) {
selector = selectInShadows('object, iframe');
}
if (_window._frameElement !== undefined) {
return _window._frameElement;
}
_window._frameElement = null;
var potentialHosts = _window.parent.document.querySelectorAll(selector);
[].some.call(potentialHosts, function (element) {
var _document = getContentDocument(element);
if (_document !== _window.document) {
return false;
}
_window._frameElement = element;
return true;
});
return _window._frameElement;
}
function getFrameElement(element) {
var _window = getWindow(element);
if (!_window.parent || _window.parent === _window) {
// if there is no parent browsing context,
// we're not going to get a frameElement either way
return null;
}
try {
// see https://developer.mozilla.org/en-US/docs/Web/API/Window/frameElement
// does not work within <embed> anywhere, and not within in <object> in IE
return _window.frameElement || findDocumentHostElement(_window);
} catch (e) {
return null;
}
}
// https://www.w3.org/TR/html5/rendering.html#being-rendered
// <area> is not rendered, but we *consider* it visible to simplfiy this function's usage
var notRenderedElementsPattern = /^(area)$/;
function computedStyle(element, property) {
return window.getComputedStyle(element, null).getPropertyValue(property);
}
function notDisplayed(_path) {
return _path.some(function (element) {
// display:none is not visible (optimized away at layout)
return computedStyle(element, 'display') === 'none';
});
}
function notVisible(_path) {
// https://github.com/jquery/jquery-ui/blob/master/ui/core.js#L109-L114
// NOTE: a nested element can reverse visibility:hidden|collapse by explicitly setting visibility:visible
// NOTE: visibility can be ["", "visible", "hidden", "collapse"]
var hidden = findIndex(_path, function (element) {
var visibility = computedStyle(element, 'visibility');
return visibility === 'hidden' || visibility === 'collapse';
});
if (hidden === -1) {
// there is no hidden element
return false;
}
var visible = findIndex(_path, function (element) {
return computedStyle(element, 'visibility') === 'visible';
});
if (visible === -1) {
// there is no visible element (but a hidden element)
return true;
}
if (hidden < visible) {
// there is a hidden element and it's closer than the first visible element
return true;
}
// there may be a hidden element, but the closest element is visible
return false;
}
function collapsedParent(_path) {
var offset = 1;
if (_path[0].nodeName.toLowerCase() === 'summary') {
offset = 2;
}
return _path.slice(offset).some(function (element) {
// "content children" of a closed details element are not visible
return element.nodeName.toLowerCase() === 'details' && element.open === false;
});
}
function isVisibleRules() {
var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
context = _ref.context,
_ref$except = _ref.except,
except = _ref$except === undefined ? {
notRendered: false,
cssDisplay: false,
cssVisibility: false,
detailsElement: false,
browsingContext: false
} : _ref$except;
var element = contextToElement({
label: 'is/visible',
resolveDocument: true,
context: context
});
var nodeName = element.nodeName.toLowerCase();
if (!except.notRendered && notRenderedElementsPattern.test(nodeName)) {
return true;
}
var _path = getParents({
context: element
});
// in Internet Explorer <audio> has a default display: none, where others have display: inline
// but IE allows focusing <audio style="display:none">, but not <div display:none><audio>
// this is irrelevant to other browsers, as the controls attribute is required to make <audio> focusable
var isAudioWithoutControls = nodeName === 'audio' && !element.hasAttribute('controls');
if (!except.cssDisplay && notDisplayed(isAudioWithoutControls ? _path.slice(1) : _path)) {
return false;
}
if (!except.cssVisibility && notVisible(_path)) {
return false;
}
if (!except.detailsElement && collapsedParent(_path)) {
return false;
}
if (!except.browsingContext) {
// elements within a browsing context are affected by the
// browsing context host element's visibility and tabindex
var frameElement = getFrameElement(element);
var _isVisible = isVisibleRules.except(except);
if (frameElement && !_isVisible(frameElement)) {
return false;
}
}
return true;
}
// bind exceptions to an iterator callback
isVisibleRules.except = function () {
var except = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
var isVisible = function isVisible(context) {
return isVisibleRules({
context: context,
except: except
});
};
isVisible.rules = isVisibleRules;
return isVisible;
};
// provide isVisible(context) as default iterator callback
var isVisible = isVisibleRules.except({});
function getMapByName(name, _document) {
// apparently getElementsByName() also considers id attribute in IE & opera
// https://developer.mozilla.org/en-US/docs/Web/API/Document/getElementsByName
var map = _document.querySelector('map[name="' + (0, _css.default)(name) + '"]');
return map || null;
}
function getImageOfArea(element) {
var map = element.parentElement;
if (!map.name || map.nodeName.toLowerCase() !== 'map') {
return null;
}
// NOTE: image maps can also be applied to <object> with image content,
// but no browser supports this at the moment
// HTML5 specifies HTMLMapElement.images to be an HTMLCollection of all
// <img> and <object> referencing the <map> element, but no browser implements this
// https://www.w3.org/TR/html5/embedded-content-0.html#the-map-element
// https://developer.mozilla.org/en-US/docs/Web/API/HTMLMapElement
// the image must be valid and loaded for the map to take effect
var _document = getDocument(element);
return _document.querySelector('img[usemap="#' + (0, _css.default)(map.name) + '"]') || null;
}
var supports$2 = void 0;
// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/map
// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#attr-usemap
// https://github.com/jquery/jquery-ui/blob/master/ui/core.js#L88-L107
function isValidArea(context) {
if (!supports$2) {
supports$2 = _supports();
}
var element = contextToElement({
label: 'is/valid-area',
context: context
});
var nodeName = element.nodeName.toLowerCase();
if (nodeName !== 'area') {
return false;
}
var hasTabindex = element.hasAttribute('tabindex');
if (!supports$2.focusAreaTabindex && hasTabindex) {
// Blink and WebKit do not consider <area tabindex="-1" href="#void"> focusable
return false;
}
var img = getImageOfArea(element);
if (!img || !isVisible(img)) {
return false;
}
// Firefox only allows fully loaded images to reference image maps
// https://stereochro.me/ideas/detecting-broken-images-js
if (!supports$2.focusBrokenImageMap && (!img.complete || !img.naturalHeight || img.offsetWidth <= 0 || img.offsetHeight <= 0)) {
return false;
}
// Firefox supports.can focus area elements even if they don't have an href attribute
if (!supports$2.focusAreaWithoutHref && !element.href) {
// Internet explorer supports.can focus area elements without href if either
// the area element or the image element has a tabindex attribute
return supports$2.focusAreaTabindex && hasTabindex || supports$2.focusAreaImgTabindex && img.hasAttribute('tabindex');
}
// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#attr-usemap
var childOfInteractive = getParents({
context: img
}).slice(1).some(function (_element) {
var name = _element.nodeName.toLowerCase();
return name === 'button' || name === 'a';
});
if (childOfInteractive) {
return false;
}
return true;
}
var supports$3 = void 0;
// https://www.w3.org/TR/html5/disabled-elements.html#concept-element-disabled
var disabledElementsPattern = void 0;
var disabledElements = {
input: true,
select: true,
textarea: true,
button: true,
fieldset: true,
form: true
};
function isNativeDisabledSupported(context) {
if (!supports$3) {
supports$3 = _supports();
if (supports$3.focusFieldsetDisabled) {
delete disabledElements.fieldset;
}
if (supports$3.focusFormDisabled) {
delete disabledElements.form;
}
disabledElementsPattern = new RegExp('^(' + Object.keys(disabledElements).join('|') + ')$');
}
var element = contextToElement({
label: 'is/native-disabled-supported',
context: context
});
var nodeName = element.nodeName.toLowerCase();
return Boolean(disabledElementsPattern.test(nodeName));
}
var supports$4 = void 0;
function isDisabledFieldset(element) {
var nodeName = element.nodeName.toLowerCase();
return nodeName === 'fieldset' && element.disabled;
}
function isDisabledForm(element) {
var nodeName = element.nodeName.toLowerCase();
return nodeName === 'form' && element.disabled;
}
function isDisabled(context) {
if (!supports$4) {
supports$4 = _supports();
}
var element = contextToElement({
label: 'is/disabled',
context: context
});
if (element.hasAttribute('data-ally-disabled')) {
// treat ally's element/disabled like the DOM native element.disabled
return true;
}
if (!isNativeDisabledSupported(element)) {
// non-form elements do not support the disabled attribute
return false;
}
if (element.disabled) {
// the element itself is disabled
return true;
}
var parents = getParents({
context: element
});
if (parents.some(isDisabledFieldset)) {
// a parental <fieldset> is disabld and inherits the state onto this element
return true;
}
if (!supports$4.focusFormDisabled && parents.some(isDisabledForm)) {
// a parental <form> is disabld and inherits the state onto this element
return true;
}
return false;
}
function isOnlyTabbableRules() {
var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
context = _ref.context,
_ref$except = _ref.except,
except = _ref$except === undefined ? {
onlyFocusableBrowsingContext: false,
visible: false
} : _ref$except;
var element = contextToElement({
label: 'is/only-tabbable',
resolveDocument: true,
context: context
});
if (!except.visible && !isVisible(element)) {
return false;
}
if (!except.onlyFocusableBrowsingContext && (platform.is.GECKO || platform.is.TRIDENT || platform.is.EDGE)) {
var frameElement = getFrameElement(element);
if (frameElement) {
if (tabindexValue(frameElement) < 0) {
// iframe[tabindex="-1"] and object[tabindex="-1"] inherit the
// tabbable demotion onto elements of their browsing contexts
return false;
}
}
}
var nodeName = element.nodeName.toLowerCase();
var tabindex = tabindexValue(element);
if (nodeName === 'label' && platform.is.GECKO) {
// Firefox cannot focus, but tab to: label[tabindex=0]
return tabindex !== null && tabindex >= 0;
}
// SVG Elements were keyboard focusable but not script focusable before Firefox 51.
// Firefox 51 added the focus management DOM API (.focus and .blur) to SVGElement,
// see https://bugzilla.mozilla.org/show_bug.cgi?id=778654
if (platform.is.GECKO && element.ownerSVGElement && !element.focus) {
if (nodeName === 'a' && element.hasAttribute('xlink:href')) {
// any focusable child of <svg> cannot be focused, but tabbed to
if (platform.is.GECKO) {
return true;
}
}
}
return false;
}
// bind exceptions to an iterator callback
isOnlyTabbableRules.except = function () {
var except = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
var isOnlyTabbable = function isOnlyTabbable(context) {
return isOnlyTabbableRules({
context: context,
except: except
});
};
isOnlyTabbable.rules = isOnlyTabbableRules;
return isOnlyTabbable;
};
// provide isOnlyTabbable(context) as default iterator callback
var isOnlyTabbable = isOnlyTabbableRules.except({});
var supports$5 = void 0;
function isOnlyFocusRelevant(element) {
var nodeName = element.nodeName.toLowerCase();
if (nodeName === 'embed' || nodeName === 'keygen') {
// embed is considered focus-relevant but not focusable
// see https://github.com/medialize/ally.js/issues/82
return true;
}
var _tabindex = tabindexValue(element);
if (element.shadowRoot && _tabindex === null) {
// ShadowDOM host elements *may* receive focus
// even though they are not considered focuable
return true;
}
if (nodeName === 'label') {
// <label tabindex="0"> is only tabbable in Firefox, not script-focusable
// there's no way to make an element focusable other than by adding a tabindex,
// and focus behavior of the label element seems hard-wired to ignore tabindex
// in some browsers (like Gecko, Blink and WebKit)
return !supports$5.focusLabelTabindex || _tabindex === null;
}
if (nodeName === 'legend') {
return _tabindex === null;
}
if (supports$5.focusSvgFocusableAttribute && (element.ownerSVGElement || nodeName === 'svg')) {
// Internet Explorer understands the focusable attribute introduced in SVG Tiny 1.2
var focusableAttribute = element.getAttribute('focusable');
return focusableAttribute && focusableAttribute === 'false';
}
if (nodeName === 'img' && element.hasAttribute('usemap')) {
// Gecko, Trident and Edge do not allow an image with an image map and tabindex to be focused,
// it appears the tabindex is overruled so focus is still forwarded to the <map>
return _tabindex === null || !supports$5.focusImgUsemapTabindex;
}
if (nodeName === 'area') {
// all <area>s are considered relevant,
// but only the valid <area>s are focusable
return !isValidArea(element);
}
return false;
}
function isFocusableRules() {
var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
context = _ref.context,
_ref$except = _ref.except,
except = _ref$except === undefined ? {
disabled: false,
visible: false,
onlyTabbable: false
} : _ref$except;
if (!supports$5) {
supports$5 = _supports();
}
var _isOnlyTabbable = isOnlyTabbable.rules.except({
onlyFocusableBrowsingContext: true,
visible: except.visible
});
var element = contextToElement({
label: 'is/focusable',
resolveDocument: true,
context: context
});
var focusRelevant = isFocusRelevant.rules({
context: element,
except: except
});
if (!focusRelevant || isOnlyFocusRelevant(element)) {
return false;
}
if (!except.disabled && isDisabled(element)) {
return false;
}
if (!except.onlyTabbable && _isOnlyTabbable(element)) {
// some elements may be keyboard focusable, but not script focusable
return false;
}
// elements that are not rendered, cannot be focused
if (!except.visible) {
var visibilityOptions = {
context: element,
except: {}
};
if (supports$5.focusInHiddenIframe) {
// WebKit and Blink can focus content in hidden <iframe> and <object>
visibilityOptions.except.browsingContext = true;
}
if (supports$5.focusObjectSvgHidden) {
// Blink allows focusing the object element, even if it has visibility: hidden;
// @browser-issue Blink https://code.google.com/p/chromium/issues/detail?id=586191
var _nodeName2 = element.nodeName.toLowerCase();
if (_nodeName2 === 'object') {
visibilityOptions.except.cssVisibility = true;
}
}
if (!isVisible.rules(visibilityOptions)) {
return false;
}
}
var frameElement = getFrameElement(element);
if (frameElement) {
var _nodeName = frameElement.nodeName.toLowerCase();
if (_nodeName === 'object' && !supports$5.focusInZeroDimensionObject) {
if (!frameElement.offsetWidth || !frameElement.offsetHeight) {
// WebKit can not focus content in <object> if it doesn't have dimensions
return false;
}
}
}
var nodeName = element.nodeName.toLowerCase();
if (nodeName === 'svg' && supports$5.focusSvgInIframe && !frameElement && element.getAttribute('tabindex') === null) {
return false;
}
return true;
}
// bind exceptions to an iterator callback
isFocusableRules.except = function () {
var except = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
var isFocusable = function isFocusable(context) {
return isFocusableRules({
context: context,
except: except
});
};
isFocusable.rules = isFocusableRules;
return isFocusable;
};
// provide isFocusRelevant(context) as default iterator callback
var isFocusable = isFocusableRules.except({});
function createFilter(condition) {
// see https://developer.mozilla.org/en-US/docs/Web/API/NodeFilter
var filter = function filter(node) {
if (node.shadowRoot) {
// return ShadowRoot elements regardless of them being focusable,
// so they can be walked recursively later
return NodeFilter.FILTER_ACCEPT;
}
if (condition(node)) {
// finds elements that could have been found by document.querySelectorAll()
return NodeFilter.FILTER_ACCEPT;
}
return NodeFilter.FILTER_SKIP;
};
// IE requires a function, Browsers require {acceptNode: function}
// see http://www.bennadel.com/blog/2607-finding-html-comment-nodes-in-the-dom-using-treewalker.htm
filter.acceptNode = filter;
return filter;
}
var PossiblyFocusableFilter = createFilter(isFocusRelevant);
function queryFocusableStrict() {
var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
context = _ref.context,
includeContext = _ref.includeContext,
includeOnlyTabbable = _ref.includeOnlyTabbable,
strategy = _ref.strategy;
if (!context) {
context = document.documentElement;
}
var _isFocusable = isFocusable.rules.except({
onlyTabbable: includeOnlyTabbable
});
var _document = getDocument(context);
// see https://developer.mozilla.org/en-US/docs/Web/API/Document/createTreeWalker
var walker = _document.createTreeWalker(
// root element to start search in
context,
// element type filter
NodeFilter.SHOW_ELEMENT,
// custom NodeFilter filter
strategy === 'all' ? PossiblyFocusableFilter : createFilter(_isFocusable),
// deprecated, but IE requires it
false);
var list = [];
while (walker.nextNode()) {
if (walker.currentNode.shadowRoot) {
if (_isFocusable(walker.currentNode)) {
list.push(walker.currentNode);
}
list = list.concat(queryFocusableStrict({
context: walker.currentNode.shadowRoot,
includeOnlyTabbable: includeOnlyTabbable,
strategy: strategy
}));
} else {
list.push(walker.currentNode);
}
}
// add context if requested and focusable
if (includeContext) {
if (strategy === 'all') {
if (isFocusRelevant(context)) {
list.unshift(context);
}
} else if (_isFocusable(context)) {
list.unshift(context);
}
}
return list;
}
// NOTE: this selector MUST *never* be used directly,
var supports$6 = void 0;
var selector$1 = void 0;
function selector$2() {
if (!supports$6) {
supports$6 = _supports();
}
if (typeof selector$1 === 'string') {
return selector$1;
}
// https://www.w3.org/TR/html5/editing.html#sequential-focus-navigation-and-the-tabindex-attribute
selector$1 = '' + (
// IE11 supports.can focus <table> and <td>
supports$6.focusTable ? 'table, td,' : '') + (
// IE11 supports.can focus <fieldset>
supports$6.focusFieldset ? 'fieldset,' : '') +
// Namespace problems of [xlink:href] explained in https://stackoverflow.com/a/23047888/515124
// svg a[*|href] does not match in IE9, but since we're filtering
// through is/focusable we can include all <a> from SVG
'svg a,' +
// may behave as 'svg, svg *,' in chrome as *every* svg element with a focus event listener is focusable
// navigational elements
'a[href],' +
// validity determined by is/valid-area.js
'area[href],' +
// validity determined by is/disabled.js
'input, select, textarea, button,' +
// browsing context containers
'iframe, object, embed,' +
// interactive content
'keygen,' + (supports$6.focusAudioWithoutControls ? 'audio,' : 'audio[controls],') + (supports$6.focusVideoWithoutControls ? 'video,' : 'video[controls],') + (supports$6.focusSummary ? 'summary,' : '') +
// validity determined by is/valid-tabindex.js
'[tabindex],' +
// editing hosts
'[contenteditable]';
// where ShadowDOM is supported, we also want the shadowed focusable elements (via ">>>" or "/deep/")
selector$1 = selectInShadows(selector$1);
return selector$1;
}
function queryFocusableQuick() {
var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
context = _ref.context,
includeContext = _ref.includeContext,
includeOnlyTabbable = _ref.includeOnlyTabbable;
var _selector = selector$2();
var elements = context.querySelectorAll(_selector);
// the selector potentially matches more than really is focusable
var _isFocusable = isFocusable.rules.except({
onlyTabbable: includeOnlyTabbable
});
var result = [].filter.call(elements, _isFocusable);
// add context if requested and focusable
if (includeContext && _isFocusable(context)) {
result.unshift(context);
}
return result;
}
function queryFocusable() {
var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
context = _ref.context,
includeContext = _ref.includeContext,
includeOnlyTabbable = _ref.includeOnlyTabbable,
_ref$strategy = _ref.strategy,
strategy = _ref$strategy === undefined ? 'quick' : _ref$strategy;
var element = contextToElement({
label: 'query/focusable',
resolveDocument: true,
defaultToDocument: true,
context: context
});
var options = {
context: element,
includeContext: includeContext,
includeOnlyTabbable: includeOnlyTabbable,
strategy: strategy
};
if (strategy === 'quick') {
return queryFocusableQuick(options);
} else if (strategy === 'strict' || strategy === 'all') {
return queryFocusableStrict(options);
}
throw new TypeError('query/focusable requires option.strategy to be one of ["quick", "strict", "all"]');
}
var supports$7 = void 0;
// Internet Explorer 11 considers fieldset, table, td focusable, but not tabbable
// Internet Explorer 11 considers body to have [tabindex=0], but does not allow tabbing to it
var focusableElementsPattern = /^(fieldset|table|td|body)$/;
function isTabbableRules() {
var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
context = _ref.context,
_ref$except = _ref.except,
except = _ref$except === undefined ? {
flexbox: false,
scrollable: false,
shadow: false,
visible: false,
onlyTabbable: false
} : _ref$except;
if (!supports$7) {
supports$7 = _supports();
}
var element = contextToElement({
label: 'is/tabbable',
resolveDocument: true,
context: context
});
if (platform.is.BLINK && platform.is.ANDROID && platform.majorVersion > 42) {
// External keyboard support worked fine in CHrome 42, but stopped working in Chrome 45.
// The on-screen keyboard does not provide a way to focus the next input element (like iOS does).
// That leaves us with no option to advance focus by keyboard, ergo nothing is tabbable (keyboard focusable).
return false;
}
var frameElement = getFrameElement(element);
if (frameElement) {
if (platform.is.WEBKIT && platform.is.IOS) {
// iOS only does not consider anything from another browsing context keyboard focusable
return false;
}
// iframe[tabindex="-1"] and object[tabindex="-1"] inherit the
// tabbable demotion onto elements of their browsing contexts
if (tabindexValue(frameElement) < 0) {
return false;
}
if (!except.visible && (platform.is.BLINK || platform.is.WEBKIT) && !isVisible(frameElement)) {
// Blink and WebKit consider elements in hidden browsing contexts focusable, but not tabbable
return false;
}
// Webkit and Blink don't consider anything in <object> tabbable
// Blink fixed that fixed in Chrome 54, Opera 41
var frameNodeName = frameElement.nodeName.toLowerCase();
if (frameNodeName === 'object') {
var isFixedBlink = platform.name === 'Chrome' && platform.majorVersion >= 54 || platform.name === 'Opera' && platform.majorVersion >= 41;
if (platform.is.WEBKIT || platform.is.BLINK && !isFixedBlink) {
return false;
}
}
}
var nodeName = element.nodeName.toLowerCase();
var _tabindex = tabindexValue(element);
var tabindex = _tabindex === null ? null : _tabindex >= 0;
if (platform.is.EDGE && platform.majorVersion >= 14 && frameElement && element.ownerSVGElement && _tabindex < 0) {
// Edge 14+ considers <a xlink:href="…" tabindex="-1"> keyboard focusable
// if the element is in a nested browsing context
return true;
}
var hasTabbableTabindexOrNone = tabindex !== false;
var hasTabbableTabindex = _tabindex !== null && _tabindex >= 0;
// NOTE: Firefox 31 considers [contenteditable] to have [tabindex=-1], but allows tabbing to it
// fixed in Firefox 40 the latest - https://bugzilla.mozilla.org/show_bug.cgi?id=1185657
if (element.hasAttribute('contenteditable')) {
// tabbing can still be disabled by explicitly providing [tabindex="-1"]
return hasTabbableTabindexOrNone;
}
if (focusableElementsPattern.test(nodeName) && tabindex !== true) {
return false;
}
if (platform.is.WEBKIT && platform.is.IOS) {
// iOS only considers a hand full of elements tabbable (keyboard focusable)
// this holds true even with external keyboards
var potentiallyTabbable = nodeName === 'input' && element.type === 'text' || element.type === 'password' || nodeName === 'select' || nodeName === 'textarea' || element.hasAttribute('contenteditable');
if (!potentiallyTabbable) {
var style = window.getComputedStyle(element, null);
potentiallyTabbable = isUserModifyWritable(style);
}
if (!potentiallyTabbable) {
return false;
}
}
if (nodeName === 'use' && _tabindex !== null) {
if (platform.is.BLINK || platform.is.WEBKIT && platform.majorVersion === 9) {
// In Chrome and Safari 9 the <use> element is keyboard focusable even for tabindex="-1"
return true;
}
}
if (elementMatches(element, 'svg a') && element.hasAttribute('xlink:href')) {
if (hasTabbableTabindexOrNone) {
// in Trident and Gecko SVGElement does not handle the tabIndex property properly
return true;
}
if (element.focus && !supports$7.focusSvgNegativeTabindexAttribute) {
// Firefox 51 and 52 treat any natively tabbable SVG element with
// tabindex="-1" as tabbable and everything else as inert
// see https://bugzilla.mozilla.org/show_bug.cgi?id=1302340
return true;
}
}
if (nodeName === 'svg' && supports$7.focusSvgInIframe && hasTabbableTabindexOrNone) {
return true;
}
if (platform.is.TRIDENT || platform.is.EDGE) {
if (nodeName === 'svg') {
if (supports$7.focusSvg) {
// older Internet Explorers consider <svg> keyboard focusable
// unless they have focsable="false", but then they wouldn't
// be focusable and thus not even reach this filter
return true;
}
// elements that have [focusable] are automatically keyboard focusable regardless of the attribute's value
return element.hasAttribute('focusable') || hasTabbableTabindex;
}
if (element.ownerSVGElement) {
if (supports$7.focusSvgTabindexAttribute && hasTabbableTabindex) {
return true;
}
// elements that have [focusable] are automatically keyboard focusable regardless of the attribute's value
return element.hasAttribute('focusable');
}
}
if (element.tabIndex === undefined) {
return Boolean(except.onlyTabbable);
}
if (nodeName === 'audio') {
if (!element.hasAttribute('controls')) {
// In Internet Explorer the <audio> element is focusable, but not tabbable, and tabIndex property is wrong
return false;
} else if (platform.is.BLINK) {
// In Chrome <audio controls tabindex="-1"> remains keyboard focusable
return true;
}
}
if (nodeName === 'video') {
if (!element.hasAttribute('controls')) {
if (platform.is.TRIDENT || platform.is.EDGE) {
// In Internet Explorer and Edge the <video> element is focusable, but not tabbable, and tabIndex property is wrong
return false;
}
} else if (platform.is.BLINK || platform.is.GECKO) {
// In Chrome and Firefox <video controls tabindex="-1"> remains keyboard focusable
return true;
}
}
if (nodeName === 'object') {
if (platform.is.BLINK || platform.is.WEBKIT) {
// In all Blink and WebKit based browsers <embed> and <object> are never keyboard focusable, even with tabindex="0" set
return false;
}
}
if (nodeName === 'iframe') {
// In Internet Explorer all iframes are only focusable
// In WebKit, Blink and Gecko iframes may be tabbable depending on content.
// Since we can't reliably investigate iframe documents because of the
// SameOriginPolicy, we're declaring everything only focusable.
return false;
}
if (!except.scrollable && platform.is.GECKO) {
// Firefox considers scrollable containers keyboard focusable,
// even though their tabIndex property is -1
var _style = window.getComputedStyle(element, null);
if (hasCssOverflowScroll(_style)) {
return hasTabbableTabindexOrNone;
}
}
if (platform.is.TRIDENT || platform.is.EDGE) {
// IE and Edge degrade <area> to script focusable, if the image
// using the <map> has been given tabindex="-1"
if (nodeName === 'area') {
var img = getImageOfArea(element);
if (img && tabindexValue(img) < 0) {
return false;
}
}
var _style2 = window.getComputedStyle(element, null);
if (isUserModifyWritable(_style2)) {
// prevent being swallowed by the overzealous isScrollableContainer() below
return element.tabIndex >= 0;
}
if (!except.flexbox && hasCssDisplayFlex(_style2)) {
if (_tabindex !== null) {
return hasTabbableTabindex;
}
return isFocusRelevantWithoutFlexbox(element) && isTabbableWithoutFlexbox(element);
}
// IE considers scrollable containers script focusable only,
// even though their tabIndex property is 0
if (isScrollableContainer(element, nodeName)) {
return false;
}
var parent = element.parentElement;
if (parent) {
var parentNodeName = parent.nodeName.toLowerCase();
var parentStyle = window.getComputedStyle(parent, null);
// IE considers scrollable bodies script focusable only,
if (isScrollableContainer(parent, nodeName, parentNodeName, parentStyle)) {
return false;
}
// Children of focusable elements with display:flex are focusable in IE10-11,
// even though their tabIndex property suggests otherwise
if (hasCssDisplayFlex(parentStyle)) {
// value of tabindex takes precedence
return hasTabbableTabindex;
}
}
}
// https://www.w3.org/WAI/PF/aria-practices/#focus_tabindex
return element.tabIndex >= 0;
}
// bind exceptions to an iterator callback
isTabbableRules.except = function () {
var except = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
var isTabbable = function isTabbable(context) {
return isTabbableRules({
context: context,
except: except
});
};
isTabbable.rules = isTabbableRules;
return isTabbable;
};
var isFocusRelevantWithoutFlexbox = isFocusRelevant.rules.except({
flexbox: true
});
var isTabbableWithoutFlexbox = isTabbableRules.except({
flexbox: true
});
// provide isTabbable(context) as default iterator callback
var isTabbable = isTabbableRules.except({});
function queryTabbable() {
var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
context = _ref.context,
includeContext = _ref.includeContext,
includeOnlyTabbable = _ref.includeOnlyTabbable,
strategy = _ref.strategy;
var _isTabbable = isTabbable.rules.except({
onlyTabbable: includeOnlyTabbable
});
return queryFocusable({
context: context,
includeContext: includeContext,
includeOnlyTabbable: includeOnlyTabbable,
strategy: strategy
}).filter(_isTabbable);
}
// sorts a list of elements according to their order in the DOM
function compareDomPosition(a, b) {
return a.compareDocumentPosition(b) & Node.DOCUMENT_POSITION_FOLLOWING ? -1 : 1;
}
function sortDomOrder(elements) {
return elements.sort(compareDomPosition);
}
function getFirstSuccessorOffset(list, target) {
// find the first element that comes AFTER the target element
return findIndex(list, function (element) {
return target.compareDocumentPosition(element) & Node.DOCUMENT_POSITION_FOLLOWING;
});
}
function findInsertionOffsets(list, elements, resolveElement) {
// instead of mutating the elements list directly, remember position and map
// to inject later, when we can do this more efficiently
var insertions = [];
elements.forEach(function (element) {
var replace = true;
var offset = list.indexOf(element);
if (offset === -1) {
// element is not in target list
offset = getFirstSuccessorOffset(list, element);
replace = false;
}
if (offset === -1) {
// there is no successor in the tabsequence,
// meaning the image must be the last element
offset = list.length;
}
// allow the consumer to replace the injected element
var injections = nodeArray(resolveElement ? resolveElement(element) : element);
if (!injections.length) {
// we can't inject zero elements
return;
}
insertions.push({
offset: offset,
replace: replace,
elements: injections
});
});
return insertions;
}
function insertElementsAtOffsets(list, insertions) {
// remember the number of elements we have already injected
// so we account for the caused index offset
var inserted = 0;
// make sure that we insert the elements in sequence,
// otherwise the offset compensation won't work
insertions.sort(function (a, b) {
return a.offset - b.offset;
});
insertions.forEach(function (insertion) {
// array.splice has an annoying function signature :(
var remove = insertion.replace ? 1 : 0;
var args = [insertion.offset + inserted, remove].concat(insertion.elements);
list.splice.apply(list, args);
inserted += insertion.elements.length - remove;
});
}
function mergeInDomOrder() {
var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
list = _ref.list,
elements = _ref.elements,
resolveElement = _ref.resolveElement;
// operate on a copy so we don't mutate the original array
var _list = list.slice(0);
// make sure the elements we're injecting are provided in DOM order
var _elements = nodeArray(elements).slice(0);
sortDomOrder(_elements);
// find the offsets within the target array (list) at which to inject
// each individual element (from elements)
var insertions = findInsertionOffsets(_list, _elements, resolveElement);
// actually inject the elements into the target array at the identified positions
insertElementsAtOffsets(_list, insertions);
return _list;
}
var _createClass = function () {
function defineProperties(target, props) {
for (var i = 0; i < props.length; i++) {
var descriptor = props[i];
descriptor.enumerable = descriptor.enumerable || false;
descriptor.configurable = true;
if ('value' in descriptor) descriptor.writable = true;
Object.defineProperty(target, descriptor.key, descriptor);
}
}
return function (Constructor, protoProps, staticProps) {
if (protoProps) defineProperties(Constructor.prototype, protoProps);
if (staticProps) defineProperties(Constructor, staticProps);
return Constructor;
};
}();
function _classCallCheck(instance, Constructor) {
if (!(instance instanceof Constructor)) {
throw new TypeError('Cannot call a class as a function');
}
}
var Maps = function () {
function Maps(context) {
_classCallCheck(this, Maps);
this._document = getDocument(context);
this.maps = {};
}
_createClass(Maps, [{
key: 'getAreasFor',
value: function getAreasFor(name) {
if (!this.maps[name]) {
// the map is not defined within the context, so we
// have to go find it elsewhere in the document
this.addMapByName(name);
}
return this.maps[name];
}
}, {
key: 'addMapByName',
value: function addMapByName(name) {
var map = getMapByName(name, this._document);
if (!map) {
// if there is no map, the img[usemap] wasn't doing anything anyway
return;
}
this.maps[map.name] = queryTabbable({
context: map
});
}
}, {
key: 'extractAreasFromList',
value: function extractAreasFromList(elements) {
// remove all <area> elements from the elements list,
// but put them the map for later retrieval
return elements.filter(function (element) {
var nodeName = element.nodeName.toLowerCase();
if (nodeName !== 'area') {
return true;
}
var map = element.parentNode;
if (!this.maps[map.name]) {
this.maps[map.name] = [];
}
this.maps[map.name].push(element);
return false;
}, this);
}
}]);
return Maps;
}();
function sortArea(elements, context) {
// images - unless they are focusable themselves, likely not
// part of the elements list, so we'll have to find them and
// sort them into the elements list manually
var usemaps = context.querySelectorAll('img[usemap]');
var maps = new Maps(context);
// remove all <area> elements from the elements list,
// but put them the map for later retrieval
var _elements = maps.extractAreasFromList(elements);
if (!usemaps.length) {
// the context does not contain any <area>s so no need
// to replace anything, just remove any maps
return _elements;
}
return mergeInDomOrder({
list: _elements,
elements: usemaps,
resolveElement: function resolveElement(image) {
var name = image.getAttribute('usemap').slice(1);
return maps.getAreasFor(name);
}
});
}
var _createClass$1 = function () {
function defineProperties(target, props) {
for (var i = 0; i < props.length; i++) {
var descriptor = props[i];
descriptor.enumerable = descriptor.enumerable || false;
descriptor.configurable = true;
if ('value' in descriptor) descriptor.writable = true;
Object.defineProperty(target, descriptor.key, descriptor);
}
}
return function (Constructor, protoProps, staticProps) {
if (protoProps) defineProperties(Constructor.prototype, protoProps);
if (staticProps) defineProperties(Constructor, staticProps);
return Constructor;
};
}();
function _classCallCheck$1(instance, Constructor) {
if (!(instance instanceof Constructor)) {
throw new TypeError('Cannot call a class as a function');
}
}
var Shadows = function () {
function Shadows(context, sortElements) {
_classCallCheck$1(this, Shadows);
// document context we're working with
this.context = context;
// callback that sorts an array of elements
this.sortElements = sortElements;
// reference to create unique IDs for each ShadowHost
this.hostCounter = 1;
// reference map for child-ShadowHosts of a ShadowHost
this.inHost = {};
// reference map for child-ShadowHost of the document
this.inDocument = [];
// reference map for ShadowHosts
this.hosts = {};
// reference map for tabbable elements of a ShadowHost
this.elements = {};
}
// remember which hosts we have to sort within later
_createClass$1(Shadows, [{
key: '_registerHost',
value: function _registerHost(host) {
if (host._sortingId) {
return;
}
// make the ShadowHost identifiable (see cleanup() for undo)
host._sortingId = 'shadow-' + this.hostCounter++;
this.hosts[host._sortingId] = host;
// hosts may contain other hosts
var parentHost = getShadowHost({
context: host
});
if (parentHost) {
this._registerHost(parentHost);
this._registerHostParent(host, parentHost);
} else {
this.inDocument.push(host);
}
}
// remember which host is the child of which other host
}, {
key: '_registerHostParent',
value: function _registerHostParent(host, parent) {
if (!this.inHost[parent._sortingId]) {
this.inHost[parent._sortingId] = [];
}
this.inHost[parent._sortingId].push(host);
}
// remember which elements a host contains
}, {
key: '_registerElement',
value: function _registerElement(element, host) {
if (!this.elements[host._sortingId]) {
this.elements[host._sortingId] = [];
}
this.elements[host._sortingId].push(element);
}
// remove shadowed elements from the sequence and register
// the ShadowHosts they belong to so we know what to sort
// later on
}, {
key: 'extractElements',
value: function extractElements(elements) {
return elements.filter(function (element) {
var host = getShadowHost({
context: element
});
if (!host) {
return true;
}
this._registerHost(host);
this._registerElement(element, host);
return false;
}, this);
}
// inject hosts into the sequence, sort everything,
// and recoursively replace hosts by its descendants
}, {
key: 'sort',
value: function sort(elements) {
var _elements = this._injectHosts(elements);
_elements = this._replaceHosts(_elements);
this._cleanup();
return _elements;
}
// merge ShadowHosts into the element lists of other ShadowHosts
// or the document, then sort the individual lists
}, {
key: '_injectHosts',
value: function _injectHosts(elements) {
Object.keys(this.hosts).forEach(function (_sortingId) {
var _list = this.elements[_sortingId];
var _elements = this.inHost[_sortingId];
var _context = this.hosts[_sortingId].shadowRoot;
this.elements[_sortingId] = this._merge(_list, _elements, _context);
}, this);
return this._merge(elements, this.inDocument, this.context);
}
}, {
key: '_merge',
value: function _merge(list, elements, context) {
var merged = mergeInDomOrder({
list: list,
elements: elements
});
return this.sortElements(merged, context);
}
}, {
key: '_replaceHosts',
value: function _replaceHosts(elements) {
return mergeInDomOrder({
list: elements,
elements: this.inDocument,
resolveElement: this._resolveHostElement.bind(this)
});
}
}, {
key: '_resolveHostElement',
value: function _resolveHostElement(host) {
var merged = mergeInDomOrder({
list: this.elements[host._sortingId],
elements: this.inHost[host._sortingId],
resolveElement: this._resolveHostElement.bind(this)
});
var _tabindex = tabindexValue(host);
if (_tabindex !== null && _tabindex > -1) {
return [host].concat(merged);
}
return merged;
}
}, {
key: '_cleanup',
value: function _cleanup() {
// remove those identifers we put on the ShadowHost to avoid using Map()
Object.keys(this.hosts).forEach(function (key) {
delete this.hosts[key]._sortingId;
}, this);
}
}]);
return Shadows;
}();
function sortShadowed(elements, context, sortElements) {
var shadows = new Shadows(context, sortElements);
var _elements = shadows.extractElements(elements);
if (_elements.length === elements.length) {
// no shadowed content found, no need to continue
return sortElements(elements);
}
return shadows.sort(_elements);
}
function sortTabindex(elements) {
// https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement.tabIndex
// elements with tabIndex "0" (including tabbableElements without tabIndex) should be navigated in the order they appear.
// elements with a positive tabIndex:
// Elements that have identical tabIndexes should be navigated in the order they appear.
// Navigation proceeds from the lowest tabIndex to the highest tabIndex.
// NOTE: sort implementation may be unstable and thus mess up DOM order,
// that's why we build a map that's being sorted instead. If we were able to rely
// on a stable sorting algorithm, sortTabindex() could be as simple as
// elements.sort(function(a, b) { return a.tabIndex - b.tabIndex; });
// at this time Chrome does not use a stable sorting algorithm
// see http://blog.rodneyrehm.de/archives/14-Sorting-Were-Doing-It-Wrong.html#stability
// NOTE: compareDocumentPosition seemed like more overhead than just sorting this with buckets
// https://developer.mozilla.org/en-US/docs/Web/API/Node.compareDocumentPosition
var map = {};
var indexes = [];
var normal = elements.filter(function (element) {
// in Trident and Gecko SVGElement does not know about the tabIndex property
var tabIndex = element.tabIndex;
if (tabIndex === undefined) {
tabIndex = tabindexValue(element);
}
// extract elements that don't need sorting
if (tabIndex <= 0 || tabIndex === null || tabIndex === undefined) {
return true;
}
if (!map[tabIndex]) {
// create sortable bucket for dom-order-preservation of elements with the same tabIndex
map[tabIndex] = [];
// maintain a list of unique tabIndexes
indexes.push(tabIndex);
}
// sort element into the proper bucket
map[tabIndex].push(element);
// element moved to sorting map, so not "normal" anymore
return false;
});
// sort the tabindex ascending,
// then resolve them to their appropriate buckets,
// then flatten the array of arrays to an array
var _elements = indexes.sort().map(function (tabIndex) {
return map[tabIndex];
}).reduceRight(function (previous, current) {
return current.concat(previous);
}, normal);
return _elements;
}
var supports$8 = void 0;
function moveContextToBeginning(elements, context) {
var pos = elements.indexOf(context);
if (pos > 0) {
var tmp = elements.splice(pos, 1);
return tmp.concat(elements);
}
return elements;
}
function sortElements(elements, _context) {
if (supports$8.tabsequenceAreaAtImgPosition) {
// Some browsers sort <area> in DOM order, some place the <area>s
// where the <img> referecing them would've been in DOM order.
// https://github.com/medialize/ally.js/issues/5
elements = sortArea(elements, _context);
}
elements = sortTabindex(elements);
return elements;
}
function queryTabsequence() {
var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
context = _ref.context,
includeContext = _ref.includeContext,
includeOnlyTabbable = _ref.includeOnlyTabbable,
strategy = _ref.strategy;
if (!supports$8) {
supports$8 = _supports();
}
var _context = nodeArray(context)[0] || document.documentElement;
var elements = queryTabbable({
context: _context,
includeContext: includeContext,
includeOnlyTabbable: includeOnlyTabbable,
strategy: strategy
});
if (document.body.createShadowRoot && platform.is.BLINK) {
// sort tabindex localized to shadow dom
// see https://github.com/medialize/ally.js/issues/6
elements = sortShadowed(elements, _context, sortElements);
} else {
elements = sortElements(elements, _context);
}
if (includeContext) {
// if we include the context itself, it has to be the first
// element of the sequence
elements = moveContextToBeginning(elements, _context);
}
return elements;
}
// codes mostly cloned from https://github.com/keithamus/jwerty/blob/master/jwerty.js
// deliberately not exposing characters like <,.-#* because they vary *wildly*
// across keyboard layouts and may cause various problems
// (e.g. "*" is "Shift +" on a German Mac keyboard)
// (e.g. "@" is "Alt L" on a German Mac keyboard)
var keycode = {
// Element Focus
tab: 9,
// Navigation
left: 37,
up: 38,
right: 39,
down: 40,
pageUp: 33,
'page-up': 33,
pageDown: 34,
'page-down': 34,
end: 35,
home: 36,
// Action
enter: 13,
escape: 27,
space: 32,
// Modifier
shift: 16,
capsLock: 20,
'caps-lock': 20,
ctrl: 17,
alt: 18,
meta: 91,
// in firefox: 224
// on mac (chrome): meta-left=91, meta-right=93
// on win (IE11): meta-left=91, meta-right=92
pause: 19,
// Content Manipulation
insert: 45,
delete: 46,
backspace: 8,
// the same logical key may be identified through different keyCodes
_alias: {
91: [92, 93, 224]
}
};
// Function keys (112 - 137)
// NOTE: not every keyboard knows F13+
for (var n = 1; n < 26; n++) {
keycode['f' + n] = n + 111;
}
// Number keys (48-57, numpad 96-105)
// NOTE: not every keyboard knows num-0+
for (var _n = 0; _n < 10; _n++) {
var code = _n + 48;
var numCode = _n + 96;
keycode[_n] = code;
keycode['num-' + _n] = numCode;
keycode._alias[code] = [numCode];
}
// Latin characters (65 - 90)
for (var _n2 = 0; _n2 < 26; _n2++) {
var _code = _n2 + 65;
var name$1 = String.fromCharCode(_code).toLowerCase();
keycode[name$1] = _code;
}
var modifier = {
alt: 'altKey',
ctrl: 'ctrlKey',
meta: 'metaKey',
shift: 'shiftKey'
};
var modifierSequence = Object.keys(modifier).map(function (name) {
return modifier[name];
});
function createExpectedModifiers(ignoreModifiers) {
var value = ignoreModifiers ? null : false;
return {
altKey: value,
ctrlKey: value,
metaKey: value,
shiftKey: value
};
}
function resolveModifiers(modifiers) {
var ignoreModifiers = modifiers.indexOf('*') !== -1;
var expected = createExpectedModifiers(ignoreModifiers);
modifiers.forEach(function (token) {
if (token === '*') {
// we've already covered the all-in operator
return;
}
// we want the modifier pressed
var value = true;
var operator = token.slice(0, 1);
if (operator === '?') {
// we don't care if the modifier is pressed
value = null;
} else if (operator === '!') {
// we do not want the modifier pressed
value = false;
}
if (value !== true) {
// compensate for the modifier's operator
token = token.slice(1);
}
var propertyName = modifier[token];
if (!propertyName) {
throw new TypeError('Unknown modifier "' + token + '"');
}
expected[propertyName] = value;
});
return expected;
}
function resolveKey(key) {
var code = keycode[key] || parseInt(key, 10);
if (!code || typeof code !== 'number' || isNaN(code)) {
throw new TypeError('Unknown key "' + key + '"');
}
return [code].concat(keycode._alias[code] || []);
}
function matchModifiers(expected, event) {
// returns true on match
return !modifierSequence.some(function (prop) {
// returns true on mismatch
return typeof expected[prop] === 'boolean' && Boolean(event[prop]) !== expected[prop];
});
}
function keyBinding(text) {
return text.split(/\s+/).map(function (_text) {
var tokens = _text.split('+');
var _modifiers = resolveModifiers(tokens.slice(0, -1));
var _keyCodes = resolveKey(tokens.slice(-1));
return {
keyCodes: _keyCodes,
modifiers: _modifiers,
matchModifiers: matchModifiers.bind(null, _modifiers)
};
});
}
// Node.compareDocumentPosition is available since IE9
// see https://developer.mozilla.org/en-US/docs/Web/API/Node.compareDocumentPosition
// callback returns true when element is contained by parent or is the parent suited for use with Array.some()
/*
USAGE:
var isChildOf = getParentComparator({parent: someNode});
listOfElements.some(isChildOf)
*/
function getParentComparator() {
var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
parent = _ref.parent,
element = _ref.element,
includeSelf = _ref.includeSelf;
if (parent) {
return function isChildOf(node) {
return Boolean(includeSelf && node === parent || parent.compareDocumentPosition(node) & Node.DOCUMENT_POSITION_CONTAINED_BY);
};
} else if (element) {
return function isParentOf(node) {
return Boolean(includeSelf && element === node || node.compareDocumentPosition(element) & Node.DOCUMENT_POSITION_CONTAINED_BY);
};
}
throw new TypeError('util/compare-position#getParentComparator required either options.parent or options.element');
}
// Bug 286933 - Key events in the autocomplete popup should be hidden from page scripts
// @browser-issue Gecko https://bugzilla.mozilla.org/show_bug.cgi?id=286933
function whenKey() {
var map = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
var bindings = {};
var context = nodeArray(map.context)[0] || document.documentElement;
delete map.context;
var filter = nodeArray(map.filter);
delete map.filter;
var mapKeys = Object.keys(map);
if (!mapKeys.length) {
throw new TypeError('when/key requires at least one option key');
}
var registerBinding = function registerBinding(event) {
event.keyCodes.forEach(function (code) {
if (!bindings[code]) {
bindings[code] = [];
}
bindings[code].push(event);
});
};
mapKeys.forEach(function (text) {
if (typeof map[text] !== 'function') {
throw new TypeError('when/key requires option["' + text + '"] to be a function');
}
var addCallback = function addCallback(event) {
event.callback = map[text];
return event;
};
keyBinding(text).map(addCallback).forEach(registerBinding);
});
var handleKeyDown = function handleKeyDown(event) {
if (event.defaultPrevented) {
return;
}
if (filter.length) {
// ignore elements within the exempted sub-trees
var isParentOfElement = getParentComparator({
element: event.target,
includeSelf: true
});
if (filter.some(isParentOfElement)) {
return;
}
}
var key = event.keyCode || event.which;
if (!bindings[key]) {
return;
}
bindings[key].forEach(function (_event) {
if (!_event.matchModifiers(event)) {
return;
}
_event.callback.call(context, event, disengage);
});
};
context.addEventListener('keydown', handleKeyDown, false);
var disengage = function disengage() {
context.removeEventListener('keydown', handleKeyDown, false);
};
return {
disengage: disengage
};
}
function _default({
context
} = {}) {
if (!context) {
context = document.documentElement;
}
// Make sure the supports tests are run before intercepting the Tab key,
// or IE10 and IE11 will fail to process the first Tab key event. Not
// limiting this warm-up to IE because it may be a problem elsewhere, too.
queryTabsequence();
return whenKey({
// Safari on OSX may require ALT+TAB to reach links,
// see https://github.com/medialize/ally.js/issues/146
'?alt+?shift+tab': function altShiftTab(event) {
// we're completely taking over the Tab key handling
event.preventDefault();
var sequence = queryTabsequence({
context: context
});
var backward = event.shiftKey;
var first = sequence[0];
var last = sequence[sequence.length - 1];
// wrap around first to last, last to first
var source = backward ? first : last;
var target = backward ? last : first;
if (isActiveElement(source)) {
target.focus();
return;
}
// find current position in tabsequence
var currentIndex = void 0;
var found = sequence.some(function (element, index) {
if (!isActiveElement(element)) {
return false;
}
currentIndex = index;
return true;
});
if (!found) {
// redirect to first as we're not in our tabsequence
first.focus();
return;
}
// shift focus to previous/next element in the sequence
var offset = backward ? -1 : 1;
sequence[currentIndex + offset].focus();
}
});
}
//# sourceMappingURL=focus-trap.js.map