accessibility-developer-tools
Version:
This is a library of accessibility-related testing and utility code.
278 lines (227 loc) • 13.1 kB
JavaScript
// Copyright 2005 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview Trogedit constants for browser features and quirks that should
* be used by the rich text editor.
*/
goog.provide('goog.editor.BrowserFeature');
goog.require('goog.editor.defines');
goog.require('goog.labs.userAgent.browser');
goog.require('goog.userAgent');
goog.require('goog.userAgent.product');
goog.require('goog.userAgent.product.isVersion');
/**
* Maps browser quirks to boolean values, detailing what the current
* browser supports.
* @const
*/
goog.editor.BrowserFeature = {
// Whether this browser uses the IE TextRange object.
HAS_IE_RANGES: goog.userAgent.IE && !goog.userAgent.isDocumentModeOrHigher(9),
// Whether this browser uses the W3C standard Range object.
// Assumes IE higher versions will be compliance with W3C standard.
HAS_W3C_RANGES: goog.userAgent.GECKO || goog.userAgent.WEBKIT ||
goog.userAgent.OPERA || goog.userAgent.EDGE ||
(goog.userAgent.IE && goog.userAgent.isDocumentModeOrHigher(9)),
// Has the contentEditable attribute, which makes nodes editable.
//
// NOTE(nicksantos): FF3 has contentEditable, but there are 3 major reasons
// why we don't use it:
// 1) In FF3, we listen for key events on the document, and we'd have to
// filter them properly. See TR_Browser.USE_DOCUMENT_FOR_KEY_EVENTS.
// 2) In FF3, we listen for focus/blur events on the document, which
// simply doesn't make sense in contentEditable. focus/blur
// on contentEditable elements still has some quirks, which we're
// talking to Firefox-team about.
// 3) We currently use Mutation events in FF3 to detect changes,
// and these are dispatched on the document only.
// If we ever hope to support FF3/contentEditable, all 3 of these issues
// will need answers. Most just involve refactoring at our end.
HAS_CONTENT_EDITABLE: goog.userAgent.IE || goog.userAgent.WEBKIT ||
goog.userAgent.OPERA || goog.userAgent.EDGE ||
(goog.editor.defines.USE_CONTENTEDITABLE_IN_FIREFOX_3 &&
goog.userAgent.GECKO && goog.userAgent.isVersionOrHigher('1.9')),
// Whether to use mutation event types to detect changes
// in the field contents.
USE_MUTATION_EVENTS: goog.userAgent.GECKO,
// Whether the browser has a functional DOMSubtreeModified event.
// TODO(user): Enable for all FF3 once we're confident this event fires
// reliably. Currently it's only enabled if using contentEditable in FF as
// we have no other choice in that case but to use this event.
HAS_DOM_SUBTREE_MODIFIED_EVENT: goog.userAgent.WEBKIT ||
(goog.editor.defines.USE_CONTENTEDITABLE_IN_FIREFOX_3 &&
goog.userAgent.GECKO && goog.userAgent.isVersionOrHigher('1.9')),
// Whether nodes can be copied from one document to another
HAS_DOCUMENT_INDEPENDENT_NODES: goog.userAgent.GECKO,
// Whether the cursor goes before or inside the first block element on
// focus, e.g., <body><p>foo</p></body>. FF will put the cursor before the
// paragraph on focus, which is wrong.
PUTS_CURSOR_BEFORE_FIRST_BLOCK_ELEMENT_ON_FOCUS: goog.userAgent.GECKO,
// Whether the selection of one frame is cleared when another frame
// is focused.
CLEARS_SELECTION_WHEN_FOCUS_LEAVES:
goog.userAgent.IE || goog.userAgent.WEBKIT || goog.userAgent.OPERA,
// Whether "unselectable" is supported as an element style.
HAS_UNSELECTABLE_STYLE: goog.userAgent.GECKO || goog.userAgent.WEBKIT,
// Whether this browser's "FormatBlock" command does not suck.
FORMAT_BLOCK_WORKS_FOR_BLOCKQUOTES:
goog.userAgent.GECKO || goog.userAgent.WEBKIT || goog.userAgent.OPERA,
// Whether this browser's "FormatBlock" command may create multiple
// blockquotes.
CREATES_MULTIPLE_BLOCKQUOTES:
(goog.userAgent.WEBKIT && !goog.userAgent.isVersionOrHigher('534.16')) ||
goog.userAgent.OPERA,
// Whether this browser's "FormatBlock" command will wrap blockquotes
// inside of divs, instead of replacing divs with blockquotes.
WRAPS_BLOCKQUOTE_IN_DIVS: goog.userAgent.OPERA,
// Whether the readystatechange event is more reliable than load.
PREFERS_READY_STATE_CHANGE_EVENT: goog.userAgent.IE,
// Whether hitting the tab key will fire a keypress event.
// see http://www.quirksmode.org/js/keys.html
// TODO(user): This is fixed in IE8 and higher.
TAB_FIRES_KEYPRESS: !goog.userAgent.IE,
// Has a standards mode quirk where width=100% doesn't do the right thing,
// but width=99% does.
// TODO(user|user): This should be fixable by less hacky means
NEEDS_99_WIDTH_IN_STANDARDS_MODE: goog.userAgent.IE,
// Whether keyboard events only reliably fire on the document.
// On Gecko without contentEditable, keyboard events only fire reliably on the
// document element. With contentEditable, the field itself is focusable,
// which means that it will fire key events. This does not apply if
// application is using ContentEditableField or otherwise overriding Field
// not to use an iframe.
USE_DOCUMENT_FOR_KEY_EVENTS: goog.userAgent.GECKO &&
!goog.editor.defines.USE_CONTENTEDITABLE_IN_FIREFOX_3,
// Whether this browser shows non-standard attributes in innerHTML.
SHOWS_CUSTOM_ATTRS_IN_INNER_HTML: goog.userAgent.IE,
// Whether this browser shrinks empty nodes away to nothing.
// (If so, we need to insert some space characters into nodes that
// shouldn't be collapsed)
COLLAPSES_EMPTY_NODES:
goog.userAgent.GECKO || goog.userAgent.WEBKIT || goog.userAgent.OPERA,
// Whether we must convert <strong> and <em> tags to <b>, <i>.
CONVERT_TO_B_AND_I_TAGS: goog.userAgent.GECKO || goog.userAgent.OPERA,
// Whether this browser likes to tab through images in contentEditable mode,
// and we like to disable this feature.
TABS_THROUGH_IMAGES: goog.userAgent.IE,
// Whether this browser unescapes urls when you extract it from the href tag.
UNESCAPES_URLS_WITHOUT_ASKING:
goog.userAgent.IE && !goog.userAgent.isVersionOrHigher('7.0'),
// Whether this browser supports execCommand("styleWithCSS") to toggle between
// inserting html tags or inline styling for things like bold, italic, etc.
HAS_STYLE_WITH_CSS:
goog.userAgent.GECKO && goog.userAgent.isVersionOrHigher('1.8') ||
goog.userAgent.WEBKIT || goog.userAgent.OPERA,
// Whether clicking on an editable link will take you to that site.
FOLLOWS_EDITABLE_LINKS: goog.userAgent.WEBKIT ||
goog.userAgent.IE && goog.userAgent.isVersionOrHigher('9'),
// Whether this browser has document.activeElement available.
HAS_ACTIVE_ELEMENT: goog.userAgent.IE || goog.userAgent.EDGE ||
goog.userAgent.OPERA ||
goog.userAgent.GECKO && goog.userAgent.isVersionOrHigher('1.9'),
// Whether this browser supports the setCapture method on DOM elements.
HAS_SET_CAPTURE: goog.userAgent.IE,
// Whether this browser can't set background color when the selection
// is collapsed.
EATS_EMPTY_BACKGROUND_COLOR: goog.userAgent.GECKO ||
goog.userAgent.WEBKIT && !goog.userAgent.isVersionOrHigher('527'),
// Whether this browser supports the "focusin" or "DOMFocusIn" event
// consistently.
// NOTE(nicksantos): FF supports DOMFocusIn, but doesn't seem to do so
// consistently.
SUPPORTS_FOCUSIN: goog.userAgent.IE || goog.userAgent.OPERA,
// Whether clicking on an image will cause the selection to move to the image.
// Note: Gecko moves the selection, but it won't always go to the image.
// For example, if the image is wrapped in a div, and you click on the img,
// anchorNode = focusNode = div, anchorOffset = 0, focusOffset = 1, so this
// is another way of "selecting" the image, but there are too many special
// cases like this so we will do the work manually.
SELECTS_IMAGES_ON_CLICK: goog.userAgent.IE || goog.userAgent.OPERA,
// Whether this browser moves <style> tags into new <head> elements.
MOVES_STYLE_TO_HEAD: goog.userAgent.WEBKIT,
// Whether this browser collapses the selection in a contenteditable when the
// mouse is pressed in a non-editable portion of the same frame, even if
// Event.preventDefault is called. This field is deprecated and unused -- only
// old versions of Opera have this bug.
COLLAPSES_SELECTION_ONMOUSEDOWN: false,
// Whether the user can actually create a selection in this browser with the
// caret in the MIDDLE of the selection by double-clicking.
CARET_INSIDE_SELECTION: goog.userAgent.OPERA,
// Whether the browser focuses <body contenteditable> automatically when
// the user clicks on <html>. This field is deprecated and unused -- only old
// versions of Opera don't have this behavior.
FOCUSES_EDITABLE_BODY_ON_HTML_CLICK: true,
// Whether to use keydown for key listening (uses keypress otherwise). Taken
// from goog.events.KeyHandler.
USES_KEYDOWN: goog.userAgent.IE || goog.userAgent.EDGE ||
goog.userAgent.WEBKIT && goog.userAgent.isVersionOrHigher('525'),
// Whether this browser converts spaces to non-breaking spaces when calling
// execCommand's RemoveFormat.
// See: https://bugs.webkit.org/show_bug.cgi?id=14062
ADDS_NBSPS_IN_REMOVE_FORMAT:
goog.userAgent.WEBKIT && !goog.userAgent.isVersionOrHigher('531'),
// Whether the browser will get stuck inside a link. That is, if your cursor
// is after a link and you type, does your text go inside the link tag.
// Bug: http://bugs.webkit.org/show_bug.cgi?id=17697
GETS_STUCK_IN_LINKS:
goog.userAgent.WEBKIT && !goog.userAgent.isVersionOrHigher('528'),
// Whether the browser corrupts empty text nodes in Node#normalize,
// removing them from the Document instead of merging them.
NORMALIZE_CORRUPTS_EMPTY_TEXT_NODES:
goog.userAgent.GECKO && goog.userAgent.isVersionOrHigher('1.9') ||
goog.userAgent.IE || goog.userAgent.EDGE || goog.userAgent.OPERA ||
goog.userAgent.WEBKIT && goog.userAgent.isVersionOrHigher('531'),
// Whether the browser corrupts all text nodes in Node#normalize,
// removing them from the Document instead of merging them.
NORMALIZE_CORRUPTS_ALL_TEXT_NODES: goog.userAgent.IE,
// Browsers where executing subscript then superscript (or vv) will cause both
// to be applied in a nested fashion instead of the first being overwritten by
// the second.
NESTS_SUBSCRIPT_SUPERSCRIPT: goog.userAgent.IE || goog.userAgent.EDGE ||
goog.userAgent.GECKO || goog.userAgent.OPERA,
// Whether this browser can place a cursor in an empty element natively.
CAN_SELECT_EMPTY_ELEMENT: !goog.userAgent.IE && !goog.userAgent.WEBKIT,
FORGETS_FORMATTING_WHEN_LISTIFYING: goog.userAgent.GECKO ||
goog.userAgent.WEBKIT && !goog.userAgent.isVersionOrHigher('526'),
LEAVES_P_WHEN_REMOVING_LISTS: goog.userAgent.IE || goog.userAgent.OPERA,
CAN_LISTIFY_BR: !goog.userAgent.IE && !goog.userAgent.OPERA,
// See bug 1286408. When somewhere inside your selection there is an element
// with a style attribute that sets the font size, if you change the font
// size, the browser creates a font tag, but the font size in the style attr
// overrides the font tag. Only webkit removes that font size from the style
// attr.
DOESNT_OVERRIDE_FONT_SIZE_IN_STYLE_ATTR:
!goog.userAgent.WEBKIT && !goog.userAgent.EDGE,
// Implements this spec about dragging files from the filesystem to the
// browser: http://www.whatwg/org/specs/web-apps/current-work/#dnd
SUPPORTS_HTML5_FILE_DRAGGING: (goog.userAgent.product.CHROME &&
goog.userAgent.product.isVersion('4')) ||
(goog.userAgent.product.SAFARI &&
goog.userAgent.isVersionOrHigher('533')) ||
(goog.userAgent.GECKO && goog.userAgent.isVersionOrHigher('2.0')) ||
(goog.userAgent.IE && goog.userAgent.isVersionOrHigher('10')) ||
// TODO(user): Remove when b/27923889 is fixed.
(goog.userAgent.OPERA &&
goog.labs.userAgent.browser.isVersionOrHigher('15')) ||
goog.userAgent.EDGE,
// Version of Opera that supports the opera-defaultBlock execCommand to change
// the default block inserted when [return] is pressed. Note that this only is
// used if the caret is not already in a block that can be repeated.
// TODO(user): Link to public documentation of this feature if Opera puts
// something up about it.
SUPPORTS_OPERA_DEFAULTBLOCK_COMMAND:
goog.userAgent.OPERA && goog.userAgent.isVersionOrHigher('11.10'),
SUPPORTS_FILE_PASTING:
goog.userAgent.product.CHROME && goog.userAgent.product.isVersion('12')
};