next-csrf/example/node_modules/ally.js/esm/selector/focusable.js

CSRF mitigation library for Next.js

// NOTE: this selector MUST *never* be used directly,
// always go through query/focusable or is/focusable.js
// there are too many edge cases that they could be covered in
// a simple CSS selector…

import selectInShadows from '../util/select-in-shadows';

import _supports from '../supports/supports';
var supports = void 0;

var selector = void 0;

export default function () {
  if (!supports) {
    supports = _supports();
  }

  if (typeof selector === 'string') {
    return selector;
  }

  // https://www.w3.org/TR/html5/editing.html#sequential-focus-navigation-and-the-tabindex-attribute
  selector = ''
  // IE11 supports.can focus <table> and <td>
  + (supports.focusTable ? 'table, td,' : '')
  // IE11 supports.can focus <fieldset>
  + (supports.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.focusAudioWithoutControls ? 'audio,' : 'audio[controls],') + (supports.focusVideoWithoutControls ? 'video,' : 'video[controls],') + (supports.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 = selectInShadows(selector);

  return selector;
}
//# sourceMappingURL=focusable.js.map