Accessibility: Improve focus management in the Media Views.

- keeps focus management only where necessary to avoid focus losses
- removes focus management where a specific user workflow was assumed
- makes the "Attachment Details" navigation buttons really disabled when there are no next or previous attachments
- adds inline comments to clarify all the usages of focus()

Fixes #43169.

Built from https://develop.svn.wordpress.org/trunk@45524


git-svn-id: http://core.svn.wordpress.org/trunk@45335 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Andrea Fercia 2019-06-12 21:03:52 +00:00
parent 9f579ea448
commit 340fd28d82
12 changed files with 171 additions and 103 deletions

View File

@ -682,14 +682,11 @@ border color while dragging a file over the uploader drop area */
content: "\f341"; content: "\f341";
} }
.edit-attachment-frame .edit-media-header .left.disabled, .edit-attachment-frame .edit-media-header [disabled],
.edit-attachment-frame .edit-media-header .right.disabled, .edit-attachment-frame .edit-media-header [disabled]:hover {
.edit-attachment-frame .edit-media-header .left.disabled:hover,
.edit-attachment-frame .edit-media-header .right.disabled:hover {
color: #ccc; color: #ccc;
background: inherit; background: inherit;
cursor: default; cursor: default;
pointer-events: none;
} }
.edit-attachment-frame .media-frame-content, .edit-attachment-frame .media-frame-content,

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@ -682,14 +682,11 @@ border color while dragging a file over the uploader drop area */
content: "\f345"; content: "\f345";
} }
.edit-attachment-frame .edit-media-header .left.disabled, .edit-attachment-frame .edit-media-header [disabled],
.edit-attachment-frame .edit-media-header .right.disabled, .edit-attachment-frame .edit-media-header [disabled]:hover {
.edit-attachment-frame .edit-media-header .left.disabled:hover,
.edit-attachment-frame .edit-media-header .right.disabled:hover {
color: #ccc; color: #ccc;
background: inherit; background: inherit;
cursor: default; cursor: default;
pointer-events: none;
} }
.edit-attachment-frame .media-frame-content, .edit-attachment-frame .media-frame-content,

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@ -1001,7 +1001,7 @@ MediaDetails = AttachmentDisplay.extend(/** @lends wp.media.view.MediaDetails.pr
AttachmentDisplay.prototype.render.apply( this, arguments ); AttachmentDisplay.prototype.render.apply( this, arguments );
setTimeout( _.bind( function() { setTimeout( _.bind( function() {
this.resetFocus(); this.scrollToTop();
}, this ), 10 ); }, this ), 10 );
this.settings = _.defaults( { this.settings = _.defaults( {
@ -1011,7 +1011,7 @@ MediaDetails = AttachmentDisplay.extend(/** @lends wp.media.view.MediaDetails.pr
return this.setMedia(); return this.setMedia();
}, },
resetFocus: function() { scrollToTop: function() {
this.$( '.embed-media-settings' ).scrollTop( 0 ); this.$( '.embed-media-settings' ).scrollTop( 0 );
} }
},/** @lends wp.media.view.MediaDetails */{ },/** @lends wp.media.view.MediaDetails */{

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@ -718,8 +718,9 @@ EditAttachments = MediaFrame.extend(/** @lends wp.media.view.MediaFrame.EditAtta
// Completely destroy the modal DOM element when closing it. // Completely destroy the modal DOM element when closing it.
this.modal.on( 'close', _.bind( function() { this.modal.on( 'close', _.bind( function() {
$( 'body' ).off( 'keydown.media-modal' ); /* remove the keydown event */ // Remove the keydown event.
// Restore the original focus item if possible $( 'body' ).off( 'keydown.media-modal' );
// Move focus back to the original item in the grid if possible.
$( 'li.attachment[data-id="' + this.model.get( 'id' ) +'"]' ).focus(); $( 'li.attachment[data-id="' + this.model.get( 'id' ) +'"]' ).focus();
this.resetRoute(); this.resetRoute();
}, this ) ); }, this ) );
@ -800,8 +801,8 @@ EditAttachments = MediaFrame.extend(/** @lends wp.media.view.MediaFrame.EditAtta
}, },
toggleNav: function() { toggleNav: function() {
this.$('.left').toggleClass( 'disabled', ! this.hasPrevious() ); this.$( '.left' ).prop( 'disabled', ! this.hasPrevious() );
this.$('.right').toggleClass( 'disabled', ! this.hasNext() ); this.$( '.right' ).prop( 'disabled', ! this.hasNext() );
}, },
/** /**
@ -831,8 +832,10 @@ EditAttachments = MediaFrame.extend(/** @lends wp.media.view.MediaFrame.EditAtta
if ( ! this.hasPrevious() ) { if ( ! this.hasPrevious() ) {
return; return;
} }
this.trigger( 'refresh', this.library.at( this.getCurrentIndex() - 1 ) ); this.trigger( 'refresh', this.library.at( this.getCurrentIndex() - 1 ) );
this.$( '.left' ).focus(); // Move focus to the Previous button. When there are no more items, to the Next button.
this.focusNavButton( this.hasPrevious() ? '.left' : '.right' );
}, },
/** /**
@ -842,8 +845,21 @@ EditAttachments = MediaFrame.extend(/** @lends wp.media.view.MediaFrame.EditAtta
if ( ! this.hasNext() ) { if ( ! this.hasNext() ) {
return; return;
} }
this.trigger( 'refresh', this.library.at( this.getCurrentIndex() + 1 ) ); this.trigger( 'refresh', this.library.at( this.getCurrentIndex() + 1 ) );
this.$( '.right' ).focus(); // Move focus to the Next button. When there are no more items, to the Previous button.
this.focusNavButton( this.hasNext() ? '.right' : '.left' );
},
/**
* Set focus to the navigation buttons depending on the browsing direction.
*
* @since 5.3.0
*
* @param {string} which A CSS selector to target the button to focus.
*/
focusNavButton: function( which ) {
$( which ).focus();
}, },
getCurrentIndex: function() { getCurrentIndex: function() {

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@ -3655,8 +3655,7 @@ Post = Select.extend(/** @lends wp.media.view.MediaFrame.Post.prototype */{
frame.close(); frame.close();
} }
// Keep focus inside media modal // Move focus to the modal after canceling a Gallery.
// after canceling a gallery
this.controller.modal.focusManager.focus(); this.controller.modal.focusManager.focus();
} }
}, },
@ -3682,6 +3681,9 @@ Post = Select.extend(/** @lends wp.media.view.MediaFrame.Post.prototype */{
} else { } else {
frame.close(); frame.close();
} }
// Move focus to the modal after canceling an Audio Playlist.
this.controller.modal.focusManager.focus();
} }
}, },
separateCancel: new wp.media.View({ separateCancel: new wp.media.View({
@ -3706,6 +3708,9 @@ Post = Select.extend(/** @lends wp.media.view.MediaFrame.Post.prototype */{
} else { } else {
frame.close(); frame.close();
} }
// Move focus to the modal after canceling a Video Playlist.
this.controller.modal.focusManager.focus();
} }
}, },
separateCancel: new wp.media.View({ separateCancel: new wp.media.View({
@ -3723,10 +3728,6 @@ Post = Select.extend(/** @lends wp.media.view.MediaFrame.Post.prototype */{
}).render(); }).render();
this.content.set( view ); this.content.set( view );
if ( ! wp.media.isTouchDevice ) {
view.url.focus();
}
}, },
editSelectionContent: function() { editSelectionContent: function() {
@ -3848,10 +3849,10 @@ Post = Select.extend(/** @lends wp.media.view.MediaFrame.Post.prototype */{
multiple: true multiple: true
}) ); }) );
this.controller.setState('gallery-edit'); // Jump to Edit Gallery view.
this.controller.setState( 'gallery-edit' );
// Keep focus inside media modal // Move focus to the modal after jumping to Edit Gallery view.
// after jumping to gallery view
this.controller.modal.focusManager.focus(); this.controller.modal.focusManager.focus();
} }
}); });
@ -3878,10 +3879,10 @@ Post = Select.extend(/** @lends wp.media.view.MediaFrame.Post.prototype */{
multiple: true multiple: true
}) ); }) );
this.controller.setState('playlist-edit'); // Jump to Edit Audio Playlist view.
this.controller.setState( 'playlist-edit' );
// Keep focus inside media modal // Move focus to the modal after jumping to Edit Audio Playlist view.
// after jumping to playlist view
this.controller.modal.focusManager.focus(); this.controller.modal.focusManager.focus();
} }
}); });
@ -3908,10 +3909,10 @@ Post = Select.extend(/** @lends wp.media.view.MediaFrame.Post.prototype */{
multiple: true multiple: true
}) ); }) );
this.controller.setState('video-playlist-edit'); // Jump to Edit Video Playlist view.
this.controller.setState( 'video-playlist-edit' );
// Keep focus inside media modal // Move focus to the modal after jumping to Edit Video Playlist view.
// after jumping to video playlist view
this.controller.modal.focusManager.focus(); this.controller.modal.focusManager.focus();
} }
}); });
@ -3981,6 +3982,8 @@ Post = Select.extend(/** @lends wp.media.view.MediaFrame.Post.prototype */{
edit.get('library').add( state.get('selection').models ); edit.get('library').add( state.get('selection').models );
state.trigger('reset'); state.trigger('reset');
controller.setState('gallery-edit'); controller.setState('gallery-edit');
// Move focus to the modal when jumping back from Add to Gallery to Edit Gallery view.
this.controller.modal.focusManager.focus();
} }
} }
} }
@ -4038,6 +4041,8 @@ Post = Select.extend(/** @lends wp.media.view.MediaFrame.Post.prototype */{
edit.get('library').add( state.get('selection').models ); edit.get('library').add( state.get('selection').models );
state.trigger('reset'); state.trigger('reset');
controller.setState('playlist-edit'); controller.setState('playlist-edit');
// Move focus to the modal when jumping back from Add to Audio Playlist to Edit Audio Playlist view.
this.controller.modal.focusManager.focus();
} }
} }
} }
@ -4092,6 +4097,8 @@ Post = Select.extend(/** @lends wp.media.view.MediaFrame.Post.prototype */{
edit.get('library').add( state.get('selection').models ); edit.get('library').add( state.get('selection').models );
state.trigger('reset'); state.trigger('reset');
controller.setState('video-playlist-edit'); controller.setState('video-playlist-edit');
// Move focus to the modal when jumping back from Add to Video Playlist to Edit Video Playlist view.
this.controller.modal.focusManager.focus();
} }
} }
} }
@ -4427,10 +4434,12 @@ Modal = wp.media.View.extend(/** @lends wp.media.view.Modal.prototype */{
// Hide modal and remove restricted media modal tab focus once it's closed // Hide modal and remove restricted media modal tab focus once it's closed
this.$el.hide().undelegate( 'keydown' ); this.$el.hide().undelegate( 'keydown' );
// Put focus back in useful location once modal is closed. // Move focus back in useful location once modal is closed.
if ( null !== this.clickedOpenerEl ) { if ( null !== this.clickedOpenerEl ) {
// Move focus back to the element that opened the modal.
this.clickedOpenerEl.focus(); this.clickedOpenerEl.focus();
} else { } else {
// Fallback to the admin page main element.
$( '#wpbody-content' ) $( '#wpbody-content' )
.attr( 'tabindex', '-1' ) .attr( 'tabindex', '-1' )
.focus(); .focus();
@ -4519,11 +4528,20 @@ var FocusManager = wp.media.View.extend(/** @lends wp.media.view.FocusManager.pr
}, },
/** /**
* Moves focus to the first visible menu item in the modal. * Gets all the tabbable elements.
*/
getTabbables: function() {
// Skip the file input added by Plupload.
return this.$( ':tabbable' ).not( '.moxie-shim input[type="file"]' );
},
/**
* Moves focus to the modal dialog.
*/ */
focus: function() { focus: function() {
this.$( '.media-menu-item' ).filter( ':visible' ).first().focus(); this.$( '.media-modal' ).focus();
}, },
/** /**
* @param {Object} event * @param {Object} event
*/ */
@ -4535,8 +4553,7 @@ var FocusManager = wp.media.View.extend(/** @lends wp.media.view.FocusManager.pr
return; return;
} }
// Skip the file input added by Plupload. tabbables = this.getTabbables();
tabbables = this.$( ':tabbable' ).not( '.moxie-shim input[type="file"]' );
// Keep tab focus within media modal while it's open // Keep tab focus within media modal while it's open
if ( tabbables.last()[0] === event.target && ! event.shiftKey ) { if ( tabbables.last()[0] === event.target && ! event.shiftKey ) {
@ -5177,7 +5194,7 @@ UploaderStatus = View.extend(/** @lends wp.media.view.UploaderStatus.prototype *
_.invoke( errors, 'remove' ); _.invoke( errors, 'remove' );
} }
wp.Uploader.errors.reset(); wp.Uploader.errors.reset();
// Keep focus within the modal after the dismiss button gets removed from the DOM. // Move focus to the modal after the dismiss button gets removed from the DOM.
this.controller.modal.focusManager.focus(); this.controller.modal.focusManager.focus();
} }
}); });
@ -5745,8 +5762,7 @@ module.exports = PriorityList;
/* 68 */ /* 68 */
/***/ (function(module, exports) { /***/ (function(module, exports) {
var $ = jQuery, var MenuItem;
MenuItem;
/** /**
* wp.media.view.MenuItem * wp.media.view.MenuItem
@ -5784,12 +5800,6 @@ MenuItem = wp.media.View.extend(/** @lends wp.media.view.MenuItem.prototype */{
} else { } else {
this.click(); this.click();
} }
// When selecting a tab along the left side,
// focus should be transferred into the main panel
if ( ! wp.media.isTouchDevice ) {
$('.media-frame-content input').first().focus();
}
}, },
click: function() { click: function() {
@ -6759,7 +6769,7 @@ Attachments = View.extend(/** @lends wp.media.view.Attachments.prototype */{
this.collection.on( 'reset', this.render, this ); this.collection.on( 'reset', this.render, this );
this.listenTo( this.controller, 'library:selection:add', this.attachmentFocus ); this.controller.on( 'library:selection:add', this.attachmentFocus, this );
// Throttle the scroll handler and bind this. // Throttle the scroll handler and bind this.
this.scroll = _.chain( this.scroll ).bind( this ).throttle( this.options.refreshSensitivity ).value(); this.scroll = _.chain( this.scroll ).bind( this ).throttle( this.options.refreshSensitivity ).value();
@ -6807,12 +6817,28 @@ Attachments = View.extend(/** @lends wp.media.view.Attachments.prototype */{
* @returns {void} * @returns {void}
*/ */
attachmentFocus: function() { attachmentFocus: function() {
this.$( 'li:first' ).focus(); /*
* @todo: when uploading new attachments, this tries to move focus to the
* attachmentz grid. Actually, a progress bar gets initially displayed
* and then updated when uploading completes, so focus is lost.
* Additionally: this view is used for both the attachments list and the
* list of selected attachments in the bottom media toolbar. Thus, when
* uploading attachments, it is called twice and returns two different `this`.
* `this.columns` is truthy within the modal.
*/
if ( this.columns ) {
// Move focus to the grid list within the modal.
this.$el.focus();
}
}, },
/** /**
* Restores focus to the selected item in the collection. * Restores focus to the selected item in the collection.
* *
* Moves focus back to the first selected attachment in the grid. Used when
* tabbing backwards from the attachment details sidebar.
* See media.view.AttachmentsBrowser.
*
* @since 4.0.0 * @since 4.0.0
* *
* @returns {void} * @returns {void}
@ -7584,6 +7610,7 @@ AttachmentsBrowser = View.extend(/** @lends wp.media.view.AttachmentsBrowser.pro
}, },
editSelection: function( modal ) { editSelection: function( modal ) {
// When editing a selection, move focus to the "Return to library" button.
modal.$( '.media-button-backToLibrary' ).focus(); modal.$( '.media-button-backToLibrary' ).focus();
}, },
@ -8066,8 +8093,7 @@ Selection = wp.media.View.extend(/** @lends wp.media.view.Selection.prototype */
event.preventDefault(); event.preventDefault();
this.collection.reset(); this.collection.reset();
// Keep focus inside media modal // Move focus to the modal.
// after clear link is selected
this.controller.modal.focusManager.focus(); this.controller.modal.focusManager.focus();
} }
}); });
@ -8380,11 +8406,6 @@ AttachmentDisplay = Settings.extend(/** @lends wp.media.view.Settings.Attachment
} }
$input.closest( '.setting' ).removeClass( 'hidden' ); $input.closest( '.setting' ).removeClass( 'hidden' );
// If the input is visible, focus and select its contents.
if ( ! wp.media.isTouchDevice && $input.is(':visible') ) {
$input.focus()[0].select();
}
} }
}); });
@ -8443,6 +8464,7 @@ module.exports = Playlist;
var Attachment = wp.media.view.Attachment, var Attachment = wp.media.view.Attachment,
l10n = wp.media.view.l10n, l10n = wp.media.view.l10n,
$ = jQuery,
Details; Details;
/** /**
@ -8488,35 +8510,98 @@ Details = Attachment.extend(/** @lends wp.media.view.Attachment.Details.prototyp
Attachment.prototype.initialize.apply( this, arguments ); Attachment.prototype.initialize.apply( this, arguments );
}, },
/**
* Gets the focusable elements to move focus to.
*
* @since 5.3.0
*/
getFocusableElements: function() {
var editedAttachment = $( 'li[data-id="' + this.model.id + '"]' );
this.previousAttachment = editedAttachment.prev();
this.nextAttachment = editedAttachment.next();
},
/**
* Moves focus to the previous or next attachment in the grid.
* Fallbacks to the upload button or media frame when there are no attachments.
*
* @since 5.3.0
*/
moveFocus: function() {
if ( this.previousAttachment.length ) {
this.previousAttachment.focus();
return;
}
if ( this.nextAttachment.length ) {
this.nextAttachment.focus();
return;
}
// Fallback: move focus to the "Select Files" button in the media modal.
if ( this.controller.uploader && this.controller.uploader.$browser ) {
this.controller.uploader.$browser.focus();
return;
}
// Last fallback.
this.moveFocusToLastFallback();
},
/**
* Moves focus to the media frame as last fallback.
*
* @since 5.3.0
*/
moveFocusToLastFallback: function() {
// Last fallback: make the frame focusable and move focus to it.
$( '.media-frame' )
.attr( 'tabindex', '-1' )
.focus();
},
/** /**
* @param {Object} event * @param {Object} event
*/ */
deleteAttachment: function( event ) { deleteAttachment: function( event ) {
event.preventDefault(); event.preventDefault();
this.getFocusableElements();
if ( window.confirm( l10n.warnDelete ) ) { if ( window.confirm( l10n.warnDelete ) ) {
this.model.destroy(); this.model.destroy();
// Keep focus inside media modal this.moveFocus();
// after image is deleted
this.controller.modal.focusManager.focus();
} }
}, },
/** /**
* @param {Object} event * @param {Object} event
*/ */
trashAttachment: function( event ) { trashAttachment: function( event ) {
var library = this.controller.library; var library = this.controller.library,
self = this;
event.preventDefault(); event.preventDefault();
this.getFocusableElements();
// When in the Media Library and the Media trash is enabled.
if ( wp.media.view.settings.mediaTrash && if ( wp.media.view.settings.mediaTrash &&
'edit-metadata' === this.controller.content.mode() ) { 'edit-metadata' === this.controller.content.mode() ) {
this.model.set( 'status', 'trash' ); this.model.set( 'status', 'trash' );
this.model.save().done( function() { this.model.save().done( function() {
library._requery( true ); library._requery( true );
/*
* @todo: We need to move focus back to the previous, next, or first
* attachment but the library gets re-queried and refreshed. Thus,
* the references to the previous attachments are lost. We need an
* alternate method.
*/
self.moveFocusToLastFallback();
} ); } );
} else { } else {
this.model.destroy(); this.model.destroy();
this.moveFocus();
} }
}, },
/** /**
@ -8546,8 +8631,8 @@ Details = Attachment.extend(/** @lends wp.media.view.Attachment.Details.prototyp
} }
}, },
/** /**
* When reverse tabbing(shift+tab) out of the right details panel, deliver * When reverse tabbing (shift+tab) out of the right details panel,
* the focus to the item in the list that was being edited. * move focus to the item that was being edited in the attachments list.
* *
* @param {Object} event * @param {Object} event
*/ */
@ -8556,11 +8641,6 @@ Details = Attachment.extend(/** @lends wp.media.view.Attachment.Details.prototyp
this.controller.trigger( 'attachment:details:shift-tab', event ); this.controller.trigger( 'attachment:details:shift-tab', event );
return false; return false;
} }
if ( 37 === event.keyCode || 38 === event.keyCode || 39 === event.keyCode || 40 === event.keyCode ) {
this.controller.trigger( 'attachment:keydown:arrow', event );
return;
}
} }
}); });
@ -8852,24 +8932,8 @@ EmbedUrl = View.extend(/** @lends wp.media.view.EmbedUrl.prototype */{
return this; return this;
}, },
ready: function() {
if ( ! wp.media.isTouchDevice ) {
this.focus();
}
},
url: function( event ) { url: function( event ) {
this.model.set( 'url', $.trim( event.target.value ) ); this.model.set( 'url', $.trim( event.target.value ) );
},
/**
* If the input is visible, focus and select its contents.
*/
focus: function() {
var $input = this.$input;
if ( $input.is(':visible') ) {
$input.focus()[0].select();
}
} }
}); });
@ -9095,7 +9159,7 @@ ImageDetails = AttachmentDisplay.extend(/** @lends wp.media.view.ImageDetails.pr
}, },
postRender: function() { postRender: function() {
setTimeout( _.bind( this.resetFocus, this ), 10 ); setTimeout( _.bind( this.scrollToTop, this ), 10 );
this.toggleLinkSettings(); this.toggleLinkSettings();
if ( window.getUserSetting( 'advImgDetails' ) === 'show' ) { if ( window.getUserSetting( 'advImgDetails' ) === 'show' ) {
this.toggleAdvanced( true ); this.toggleAdvanced( true );
@ -9103,8 +9167,7 @@ ImageDetails = AttachmentDisplay.extend(/** @lends wp.media.view.ImageDetails.pr
this.trigger( 'post-render' ); this.trigger( 'post-render' );
}, },
resetFocus: function() { scrollToTop: function() {
this.$( '.link-to-custom' ).blur();
this.$( '.embed-media-settings' ).scrollTop( 0 ); this.$( '.embed-media-settings' ).scrollTop( 0 );
}, },
@ -9436,12 +9499,7 @@ EditImage = View.extend(/** @lends wp.media.view.EditImage.prototype */{
}, },
loadEditor: function() { loadEditor: function() {
var dfd = this.editor.open( this.model.get('id'), this.model.get('nonces').edit, this ); this.editor.open( this.model.get( 'id' ), this.model.get( 'nonces' ).edit, this );
dfd.done( _.bind( this.focus, this ) );
},
focus: function() {
this.$( '.imgedit-submit .button' ).eq( 0 ).focus();
}, },
back: function() { back: function() {

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@ -323,8 +323,8 @@ function wp_print_media_templates() {
<?php // Template for the Attachment Details layout in the media browser. ?> <?php // Template for the Attachment Details layout in the media browser. ?>
<script type="text/html" id="tmpl-edit-attachment-frame"> <script type="text/html" id="tmpl-edit-attachment-frame">
<div class="edit-media-header"> <div class="edit-media-header">
<button class="left dashicons <# if ( ! data.hasPrevious ) { #> disabled <# } #>"><span class="screen-reader-text"><?php _e( 'Previous' ); ?></span></button> <button class="left dashicons"<# if ( ! data.hasPrevious ) { #> disabled<# } #>><span class="screen-reader-text"><?php _e( 'Edit previous media item' ); ?></span></button>
<button class="right dashicons <# if ( ! data.hasNext ) { #> disabled <# } #>"><span class="screen-reader-text"><?php _e( 'Next' ); ?></span></button> <button class="right dashicons"<# if ( ! data.hasNext ) { #> disabled<# } #>><span class="screen-reader-text"><?php _e( 'Edit next media item' ); ?></span></button>
<button type="button" class="media-modal-close"><span class="media-modal-icon"><span class="screen-reader-text"><?php _e( 'Close dialog' ); ?></span></span></button> <button type="button" class="media-modal-close"><span class="media-modal-icon"><span class="screen-reader-text"><?php _e( 'Close dialog' ); ?></span></span></button>
</div> </div>
<div class="media-frame-title"></div> <div class="media-frame-title"></div>

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@ -13,7 +13,7 @@
* *
* @global string $wp_version * @global string $wp_version
*/ */
$wp_version = '5.3-alpha-45522'; $wp_version = '5.3-alpha-45524';
/** /**
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema. * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.