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<title>[45866] branches/5.2/src: Accessibility: Make the Media modal an ARIA modal dialog.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/45866">45866</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/45866","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>SergeyBiryukov</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2019-08-20 22:41:02 +0000 (Tue, 20 Aug 2019)</dd>
</dl>
<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Accessibility: Make the Media modal an ARIA modal dialog.
For a number of years, the Media modal missed an explicit ARIA role and the required attributes for modal dialogs.
This was confusing for assistive technology users, since they may not realize they're inside a dialog, and that consequently the keyboard interactions may be different from the rest of the page. Lack of an explicit label for the dialog was confusing as well, since assistive technology users didn't have an immediate sense of what the dialog is for.
This change makes the Media modal meet the ARIA Authoring Practices recommendations, helping users better understand the purpose and interactions with the modal. Also, it makes sure to hide the rest of the page content from assistive technologies, until support for `aria-modal="true"` improves.
Additionally:
- moves the modal H1 heading to the beginning of the modal content
- changes the modal left menu position to make visual and DOM order match
- improves the `wp.media.view.FocusManager` documentation
Props afercia.
Merges <a href="https://core.trac.wordpress.org/changeset/45572">[45572]</a> to the 5.2 branch.
Fixes <a href="https://core.trac.wordpress.org/ticket/47145">#47145</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#branches52srcjsmediaviewsfocusmanagerjs">branches/5.2/src/js/media/views/focus-manager.js</a></li>
<li><a href="#branches52srcjsmediaviewsmodaljs">branches/5.2/src/js/media/views/modal.js</a></li>
<li><a href="#branches52srcwpincludescssmediaviewscss">branches/5.2/src/wp-includes/css/media-views.css</a></li>
<li><a href="#branches52srcwpincludesmediatemplatephp">branches/5.2/src/wp-includes/media-template.php</a></li>
</ul>
<h3>Property Changed</h3>
<ul>
<li><a href="#branches52">branches/5.2/</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<span class="cx" style="display: block; padding: 0 10px">Index: branches/5.2
</span><span class="cx" style="display: block; padding: 0 10px">===================================================================
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">--- branches/5.2 2019-08-20 19:14:29 UTC (rev 45865)
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+++ branches/5.2 2019-08-20 22:41:02 UTC (rev 45866)
</ins><a id="branches52"></a>
<div class="propset"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Property changes: branches/5.2</h4>
<pre class="diff"><span>
</span></pre></div>
<a id="svnmergeinfo"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: svn:mergeinfo</h4></div>
<span class="cx" style="display: block; padding: 0 10px"> /branches/3.4:21757
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/4.9:43557,43622
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/5.0:43681-43682,43684-43688,43719-43720,43723,43726-43727,43729-43731,43734-43744,43747,43751-43754,43758,43760-43765,43767-43770,43772,43774-43781,43783,43785,43790-43806,43808-43821,43825,43828,43830-43834,43836-43843,43846-43863,43867-43889,43891-43894,43897-43905,43908-43909,43911-43929,43931-43942,43946-43947,43949-43956,43959-43964,43967-43969,43988,43994,44014,44017,44047,44183,44185,44187-44206,44208-44213,44231-44232,44235,44248,44284,44287-44288
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-/trunk:45284-45285,45287,45289,45292,45296,45298,45300-45301,45308-45311,45316,45319,45322,45324,45326,45328,45331,45334,45336,45338,45340,45342,45344-45346,45348,45350,45352,45357,45365,45367,45376,45403,45411,45416,45425,45463,45481,45488,45495,45501-45503,45506-45507,45515,45520,45522,45526-45527,45529,45551,45563-45564,45569,45576,45618-45619,45626,45655-45656,45673,45684,45701,45722,45725,45727,45750,45761,45764,45861,45863
</del><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+/trunk:45284-45285,45287,45289,45292,45296,45298,45300-45301,45308-45311,45316,45319,45322,45324,45326,45328,45331,45334,45336,45338,45340,45342,45344-45346,45348,45350,45352,45357,45365,45367,45376,45403,45411,45416,45425,45463,45481,45488,45495,45501-45503,45506-45507,45515,45520,45522,45526-45527,45529,45551,45563-45564,45569,45572,45576,45618-45619,45626,45655-45656,45673,45684,45701,45722,45725,45727,45750,45761,45764,45861,45863
</ins><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><a id="branches52srcjsmediaviewsfocusmanagerjs"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/5.2/src/js/media/views/focus-manager.js</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/5.2/src/js/media/views/focus-manager.js 2019-08-20 19:14:29 UTC (rev 45865)
+++ branches/5.2/src/js/media/views/focus-manager.js 2019-08-20 22:41:02 UTC (rev 45866)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -16,12 +16,22 @@
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><span class="cx" style="display: block; padding: 0 10px"> * Moves focus to the first visible menu item in the modal.
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ *
+ * @since 3.5.0
+ *
+ * @returns {void}
</ins><span class="cx" style="display: block; padding: 0 10px"> */
</span><span class="cx" style="display: block; padding: 0 10px"> focus: function() {
</span><span class="cx" style="display: block; padding: 0 10px"> this.$( '.media-menu-item' ).filter( ':visible' ).first().focus();
</span><span class="cx" style="display: block; padding: 0 10px"> },
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- * @param {Object} event
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * Constrains navigation with the Tab key within the media view element.
+ *
+ * @since 4.0.0
+ *
+ * @param {Object} event A keydown jQuery event.
+ *
+ * @returns {void}
</ins><span class="cx" style="display: block; padding: 0 10px"> */
</span><span class="cx" style="display: block; padding: 0 10px"> constrainTabbing: function( event ) {
</span><span class="cx" style="display: block; padding: 0 10px"> var tabbables;
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -42,8 +52,107 @@
</span><span class="cx" style="display: block; padding: 0 10px"> tabbables.last().focus();
</span><span class="cx" style="display: block; padding: 0 10px"> return false;
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- }
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ },
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ /**
+ * Hides from assistive technologies all the body children except the
+ * provided element and other elements that should not be hidden.
+ *
+ * The reason why we use `aria-hidden` is that `aria-modal="true"` is buggy
+ * in Safari 11.1 and support is spotty in other browsers. In the future we
+ * should consider to remove this helper function and only use `aria-modal="true"`.
+ *
+ * @since 5.3.0
+ *
+ * @param {object} visibleElement The jQuery object representing the element that should not be hidden.
+ *
+ * @returns {void}
+ */
+ setAriaHiddenOnBodyChildren: function( visibleElement ) {
+ var bodyChildren,
+ self = this;
+
+ if ( this.isBodyAriaHidden ) {
+ return;
+ }
+
+ // Get all the body children.
+ bodyChildren = document.body.children;
+
+ // Loop through the body children and hide the ones that should be hidden.
+ _.each( bodyChildren, function( element ) {
+ // Don't hide the modal element.
+ if ( element === visibleElement[0] ) {
+ return;
+ }
+
+ // Determine the body children to hide.
+ if ( self.elementShouldBeHidden( element ) ) {
+ element.setAttribute( 'aria-hidden', 'true' );
+ // Store the hidden elements.
+ self.ariaHiddenElements.push( element );
+ }
+ } );
+
+ this.isBodyAriaHidden = true;
+ },
+
+ /**
+ * Makes visible again to assistive technologies all body children
+ * previously hidden and stored in this.ariaHiddenElements.
+ *
+ * @since 5.3.0
+ *
+ * @returns {void}
+ */
+ removeAriaHiddenFromBodyChildren: function() {
+ _.each( this.ariaHiddenElements, function( element ) {
+ element.removeAttribute( 'aria-hidden' );
+ } );
+
+ this.ariaHiddenElements = [];
+ this.isBodyAriaHidden = false;
+ },
+
+ /**
+ * Determines if the passed element should not be hidden from assistive technologies.
+ *
+ * @since 5.3.0
+ *
+ * @param {object} element The DOM element that should be checked.
+ *
+ * @returns {boolean} Whether the element should not be hidden from assistive technologies.
+ */
+ elementShouldBeHidden: function( element ) {
+ var role = element.getAttribute( 'role' ),
+ liveRegionsRoles = [ 'alert', 'status', 'log', 'marquee', 'timer' ];
+
+ /*
+ * Don't hide scripts, elements that already have `aria-hidden`, and
+ * ARIA live regions.
+ */
+ return ! (
+ element.tagName === 'SCRIPT' ||
+ element.hasAttribute( 'aria-hidden' ) ||
+ element.hasAttribute( 'aria-live' ) ||
+ liveRegionsRoles.indexOf( role ) !== -1
+ );
+ },
+
+ /**
+ * Whether the body children are hidden from assistive technologies.
+ *
+ * @since 5.3.0
+ */
+ isBodyAriaHidden: false,
+
+ /**
+ * Stores an array of DOM elements that should be hidden from assistive
+ * technologies, for example when the media modal dialog opens.
+ *
+ * @since 5.3.0
+ */
+ ariaHiddenElements: []
</ins><span class="cx" style="display: block; padding: 0 10px"> });
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> module.exports = FocusManager;
</span></span></pre></div>
<a id="branches52srcjsmediaviewsmodaljs"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/5.2/src/js/media/views/modal.js</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/5.2/src/js/media/views/modal.js 2019-08-20 19:14:29 UTC (rev 45865)
+++ branches/5.2/src/js/media/views/modal.js 2019-08-20 22:41:02 UTC (rev 45866)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -117,6 +117,9 @@
</span><span class="cx" style="display: block; padding: 0 10px"> // Set initial focus on the content instead of this view element, to avoid page scrolling.
</span><span class="cx" style="display: block; padding: 0 10px"> this.$( '.media-modal' ).focus();
</span><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // Hide the page content from assistive technologies.
+ this.focusManager.setAriaHiddenOnBodyChildren( $el );
+
</ins><span class="cx" style="display: block; padding: 0 10px"> return this.propagate('open');
</span><span class="cx" style="display: block; padding: 0 10px"> },
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -135,6 +138,12 @@
</span><span class="cx" style="display: block; padding: 0 10px"> // Hide modal and remove restricted media modal tab focus once it's closed
</span><span class="cx" style="display: block; padding: 0 10px"> this.$el.hide().undelegate( 'keydown' );
</span><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ /*
+ * Make visible again to assistive technologies all body children that
+ * have been made hidden when the modal opened.
+ */
+ this.focusManager.removeAriaHiddenFromBodyChildren();
+
</ins><span class="cx" style="display: block; padding: 0 10px"> // Put focus back in useful location once modal is closed.
</span><span class="cx" style="display: block; padding: 0 10px"> if ( null !== this.clickedOpenerEl ) {
</span><span class="cx" style="display: block; padding: 0 10px"> this.clickedOpenerEl.focus();
</span></span></pre></div>
<a id="branches52srcwpincludescssmediaviewscss"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/5.2/src/wp-includes/css/media-views.css</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/5.2/src/wp-includes/css/media-views.css 2019-08-20 19:14:29 UTC (rev 45865)
+++ branches/5.2/src/wp-includes/css/media-views.css 2019-08-20 22:41:02 UTC (rev 45866)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -539,7 +539,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> right: 0;
</span><span class="cx" style="display: block; padding: 0 10px"> bottom: 0;
</span><span class="cx" style="display: block; padding: 0 10px"> margin: 0;
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- padding: 10px 0;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ padding: 50px 0 10px;
</ins><span class="cx" style="display: block; padding: 0 10px"> background: #f3f3f3;
</span><span class="cx" style="display: block; padding: 0 10px"> border-right-width: 1px;
</span><span class="cx" style="display: block; padding: 0 10px"> border-right-style: solid;
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2561,8 +2561,9 @@
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> /* Landscape specific header override */
</span><span class="cx" style="display: block; padding: 0 10px"> @media screen and (max-height: 400px) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- .media-menu {
- padding: 0;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ .media-menu,
+ .media-frame:not(.hide-menu) .media-menu {
+ top: 44px;
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> .media-frame-router {
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2583,6 +2584,14 @@
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+@media only screen and (min-width: 901px) and (max-height: 400px) {
+ .media-menu,
+ .media-frame:not(.hide-menu) .media-menu {
+ top: 0;
+ padding-top: 44px;
+ }
+}
+
</ins><span class="cx" style="display: block; padding: 0 10px"> @media only screen and (max-width: 480px) {
</span><span class="cx" style="display: block; padding: 0 10px"> .media-modal-close {
</span><span class="cx" style="display: block; padding: 0 10px"> top: -5px;
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2609,6 +2618,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> .media-frame-router,
</span><span class="cx" style="display: block; padding: 0 10px"> .media-frame:not(.hide-menu) .media-menu {
</span><span class="cx" style="display: block; padding: 0 10px"> top: 40px;
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ padding-top: 0;
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> .media-frame-content {
</span></span></pre></div>
<a id="branches52srcwpincludesmediatemplatephp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/5.2/src/wp-includes/media-template.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/5.2/src/wp-includes/media-template.php 2019-08-20 19:14:29 UTC (rev 45865)
+++ branches/5.2/src/wp-includes/media-template.php 2019-08-20 22:41:02 UTC (rev 45866)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -185,8 +185,8 @@
</span><span class="cx" style="display: block; padding: 0 10px"> </style>
</span><span class="cx" style="display: block; padding: 0 10px"> <![endif]-->
</span><span class="cx" style="display: block; padding: 0 10px"> <script type="text/html" id="tmpl-media-frame">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ <div class="media-frame-title" id="media-frame-title"></div>
</ins><span class="cx" style="display: block; padding: 0 10px"> <div class="media-frame-menu"></div>
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- <div class="media-frame-title"></div>
</del><span class="cx" style="display: block; padding: 0 10px"> <div class="media-frame-router"></div>
</span><span class="cx" style="display: block; padding: 0 10px"> <div class="media-frame-content"></div>
</span><span class="cx" style="display: block; padding: 0 10px"> <div class="media-frame-toolbar"></div>
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -194,11 +194,11 @@
</span><span class="cx" style="display: block; padding: 0 10px"> </script>
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> <script type="text/html" id="tmpl-media-modal">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- <div tabindex="0" class="<?php echo $class; ?>">
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ <div tabindex="0" class="<?php echo $class; ?>" role="dialog" aria-modal="true" aria-labelledby="media-frame-title">
</ins><span class="cx" style="display: block; padding: 0 10px"> <# if ( data.hasCloseButton ) { #>
</span><span class="cx" style="display: block; padding: 0 10px"> <button type="button" class="media-modal-close"><span class="media-modal-icon"><span class="screen-reader-text"><?php _e( 'Close dialog' ); ?></span></span></button>
</span><span class="cx" style="display: block; padding: 0 10px"> <# } #>
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- <div class="media-modal-content"></div>
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ <div class="media-modal-content" role="document"></div>
</ins><span class="cx" style="display: block; padding: 0 10px"> </div>
</span><span class="cx" style="display: block; padding: 0 10px"> <div class="media-modal-backdrop"></div>
</span><span class="cx" style="display: block; padding: 0 10px"> </script>
</span></span></pre>
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