Index: src/js/media/views/attachments/browser.js
===================================================================
--- src/js/media/views/attachments/browser.js	(revision 46374)
+++ src/js/media/views/attachments/browser.js	(working copy)
@@ -132,7 +132,8 @@
 	},
 
 	createToolbar: function() {
-		var LibraryViewSwitcher, Filters, toolbarOptions;
+		var LibraryViewSwitcher, Filters, toolbarOptions,
+			showFilterByType = -1 !== $.inArray( this.options.filters, [ 'uploaded', 'all' ] );
 
 		toolbarOptions = {
 			controller: this.controller
@@ -153,9 +154,21 @@
 			priority: -60
 		}) );
 
-		if ( -1 !== $.inArray( this.options.filters, [ 'uploaded', 'all' ] ) ) {
-			// "Filters" will return a <select>, need to render
-			// screen reader text before
+		if ( showFilterByType || this.options.date ) {
+			/*
+			 * Create a h2 heading before the select elements that filter attachments.
+			 * This heading is visible in the modal and visually hidden in the grid.
+			 */
+			this.toolbar.set( 'filters-heading', new wp.media.view.Heading( {
+				priority:   -100,
+				text:       l10n.filterAttachments,
+				level:      'h2',
+				className:  'media-attachments-filter-heading'
+			}).render() );
+		}
+
+		if ( showFilterByType ) {
+			// "Filters" is a <select>, a visually hidden label element needs to be rendered before.
 			this.toolbar.set( 'filtersLabel', new wp.media.view.Label({
 				value: l10n.filterByType,
 				attributes: {
@@ -195,7 +208,7 @@
 				priority: -90
 			}).render() );
 
-			// DateFilter is a <select>, screen reader text needs to be rendered before
+			// DateFilter is a <select>, a visually hidden label element needs to be rendered before.
 			this.toolbar.set( 'dateFilterLabel', new wp.media.view.Label({
 				value: l10n.filterByDate,
 				attributes: {
@@ -317,7 +330,7 @@
 			}
 
 		} else if ( this.options.date ) {
-			// DateFilter is a <select>, screen reader text needs to be rendered before
+			// DateFilter is a <select>, a visually hidden label element needs to be rendered before.
 			this.toolbar.set( 'dateFilterLabel', new wp.media.view.Label({
 				value: l10n.filterByDate,
 				attributes: {
@@ -333,7 +346,7 @@
 		}
 
 		if ( this.options.search ) {
-			// Search is an input, screen reader text needs to be rendered before
+			// Search is an input, a visually hidden label element needs to be rendered before.
 			this.toolbar.set( 'searchLabel', new wp.media.view.Label({
 				value: l10n.searchMediaLabel,
 				attributes: {
Index: src/js/media/views/selection.js
===================================================================
--- src/js/media/views/selection.js	(revision 46374)
+++ src/js/media/views/selection.js	(working copy)
@@ -1,4 +1,5 @@
-var l10n = wp.media.view.l10n,
+var _n = wp.i18n._n,
+	sprintf = wp.i18n.sprintf,
 	Selection;
 
 /**
@@ -60,7 +61,10 @@
 		this.$el.toggleClass( 'one', 1 === collection.length );
 		this.$el.toggleClass( 'editing', editing );
 
-		this.$('.count').text( l10n.selected.replace('%d', collection.length) );
+		this.$( '.count' ).text(
+			/* translators: %s: Number of selected media attachments. */
+			sprintf( _n( '%s item selected', '%s items selected', collection.length ), collection.length )
+		);
 	},
 
 	edit: function( event ) {
Index: src/wp-includes/css/media-views.css
===================================================================
--- src/wp-includes/css/media-views.css	(revision 46374)
+++ src/wp-includes/css/media-views.css	(working copy)
@@ -268,7 +268,7 @@
 }
 
 .media-modal-content .media-frame select.attachment-filters {
-	margin-top: 11px;
+	margin-top: 32px;
 	margin-right: 2%;
 	width: 42%;
 	width: calc(48% - 12px);
@@ -307,12 +307,6 @@
 	border-top: 1px solid #ddd;
 }
 
-@media screen and (max-width: 782px) {
-	.media-frame-toolbar .media-toolbar {
-		bottom: -48px;
-	}
-}
-
 .media-toolbar-primary {
 	float: right;
 	height: 100%;
@@ -768,6 +762,7 @@
 }
 
 .media-frame.hide-menu .media-frame-menu,
+.media-frame.hide-menu .media-frame-menu-heading,
 .media-frame.hide-router .media-frame-router,
 .media-frame.hide-toolbar .media-frame-toolbar {
 	display: none;
@@ -780,6 +775,32 @@
 	margin: 0;
 }
 
+.media-frame-menu-heading,
+.media-attachments-filter-heading {
+	position: absolute;
+	left: 20px;
+	top: 22px;
+	margin: 0;
+	font-size: 13px;
+	line-height: 1;
+	/* Above the media-frame-menu. */
+	z-index: 151;
+}
+
+.media-attachments-filter-heading {
+	top: 10px;
+	left: 16px;
+}
+
+.mode-grid .media-attachments-filter-heading {
+	top: 0;
+	left: -9999px;
+}
+
+.mode-grid .media-frame-actions-heading {
+	display: none;
+}
+
 .wp-core-ui .button.media-frame-menu-toggle {
 	display: none;
 }
@@ -849,7 +870,7 @@
  * Search
  */
 .media-frame .search {
-	margin-top: 10px;
+	margin-top: 32px;
 	padding: 4px;
 	font-size: 13px;
 	color: #444;
@@ -1106,7 +1127,8 @@
 
 .attachments-browser .media-toolbar {
 	right: 300px;
-	height: 50px;
+	height: 72px;
+	background: #fff;
 }
 
 .attachments-browser.hide-sidebar .media-toolbar {
@@ -1127,7 +1149,7 @@
 .attachments-browser .attachments,
 .attachments-browser .uploader-inline {
 	position: absolute;
-	top: 50px;
+	top: 72px;
 	left: 0;
 	right: 300px;
 	bottom: 0;
@@ -2330,7 +2352,8 @@
 		overflow: auto;
 		z-index: 2000;
 		top: 75px;
-		left: 0;
+		left: 50%;
+		transform: translateX(-50%);
 		right: auto;
 		bottom: auto;
 		padding: 5px 0;
@@ -2350,17 +2373,35 @@
 		margin: 5px 10px;
 	}
 
+	/* Visually hide the mehu heading keeping it available to assistive technologies. */
+	.media-frame-menu-heading {
+		clip: rect(1px, 1px, 1px, 1px);
+		-webkit-clip-path: inset(50%);
+		clip-path: inset(50%);
+		height: 1px;
+		overflow: hidden;
+		padding: 0;
+		width: 1px;
+		word-wrap: normal !important;
+	}
+
+	/* Reveal the menu toggle button. */
 	.wp-core-ui .media-frame:not(.hide-menu) .button.media-frame-menu-toggle {
 		display: inline-flex;
 		align-items: center;
-		vertical-align: top;
-		min-height: 40px;
-		margin: -6px 6px 0;
+		position: absolute;
+		left: 50%;
+		transform: translateX(-50%);
+		margin: -6px 0 0;
 		padding: 0 2px 0 12px;
 		font-size: 0.875rem;
 		font-weight: 600;
 		text-decoration: none;
 		background: transparent;
+		/* Only for IE11 to vertically align text within the inline-flex button */
+		height: 0.1%;
+		/* Modern browsers */
+		min-height: 40px;
 	}
 
 	.wp-core-ui .button.media-frame-menu-toggle:hover,
@@ -2564,8 +2605,31 @@
 	.media-frame select {
 		font-size: 16px;
 	}
+
+	.media-frame .media-toolbar input[type="search"] {
+		line-height: 1.625; /* 26px */
+	}
 }
 
+@media screen and (max-width: 782px) {
+	.attachments-browser .media-toolbar {
+		height: 82px;
+	}
+
+	.attachments-browser .attachments,
+	.attachments-browser .uploader-inline {
+		top: 82px;
+	}
+
+	.media-frame .media-toolbar input[type="search"] {
+		line-height: 2.25; /* 36px */
+	}
+
+	.media-frame-toolbar .media-toolbar {
+		bottom: -48px;
+	}
+}
+
 /* Responsive on portrait and landscape */
 @media only screen and (max-width: 640px), screen and (max-height: 400px) {
 	/* Full-bleed modal */
@@ -2635,10 +2699,6 @@
 	.wp-core-ui.wp-customizer .media-button {
 		margin-top: 13px;
 	}
-
-	.media-frame.hide-router .media-frame-content {
-		top: 40px;
-	}
 }
 
 /**
Index: src/wp-includes/media-template.php
===================================================================
--- src/wp-includes/media-template.php	(revision 46374)
+++ src/wp-includes/media-template.php	(working copy)
@@ -178,6 +178,7 @@
 	<?php // Template for the media frame: used both in the media grid and in the media modal. ?>
 	<script type="text/html" id="tmpl-media-frame">
 		<div class="media-frame-title" id="media-frame-title"></div>
+		<h2 class="media-frame-menu-heading"><?php _e( 'Media Types' ); ?></h2>
 		<button type="button" class="button button-link media-frame-menu-toggle" aria-expanded="false">
 			<?php _e( 'Media Types' ); ?>
 			<span class="dashicons dashicons-arrow-down" aria-hidden="true"></span>
@@ -187,6 +188,7 @@
 			<div class="media-frame-router"></div>
 			<div class="media-frame-content"></div>
 		</div>
+		<h2 class="media-frame-actions-heading screen-reader-text"><?php _e( 'Available actions' ); ?></h2>
 		<div class="media-frame-toolbar"></div>
 		<div class="media-frame-uploader"></div>
 	</script>
Index: src/wp-includes/media.php
===================================================================
--- src/wp-includes/media.php	(revision 46374)
+++ src/wp-includes/media.php	(working copy)
@@ -3931,7 +3931,8 @@
 		'addToVideoPlaylistTitle'     => __( 'Add to Video Playlist' ),
 
 		// Headings
-		'attachmentsList'             => __( 'Attachments list' ),
+		'filterAttachments'           => __( 'Filter Media' ),
+		'attachmentsList'             => __( 'Media list' ),
 	);
 
 	/**
Index: src/wp-includes/script-loader.php
===================================================================
--- src/wp-includes/script-loader.php	(revision 46374)
+++ src/wp-includes/script-loader.php	(working copy)
@@ -1617,7 +1617,7 @@
 
 	// To enqueue media-views or media-editor, call wp_enqueue_media().
 	// Both rely on numerous settings, styles, and templates to operate correctly.
-	$scripts->add( 'media-views', "/wp-includes/js/media-views$suffix.js", array( 'utils', 'media-models', 'wp-plupload', 'jquery-ui-sortable', 'wp-mediaelement', 'wp-api-request', 'wp-a11y' ), false, 1 );
+	$scripts->add( 'media-views', "/wp-includes/js/media-views$suffix.js", array( 'utils', 'media-models', 'wp-plupload', 'jquery-ui-sortable', 'wp-mediaelement', 'wp-api-request', 'wp-a11y', 'wp-i18n' ), false, 1 );
 	$scripts->add( 'media-editor', "/wp-includes/js/media-editor$suffix.js", array( 'shortcode', 'media-views' ), false, 1 );
 	$scripts->add( 'media-audiovideo', "/wp-includes/js/media-audiovideo$suffix.js", array( 'media-editor' ), false, 1 );
 	$scripts->add( 'mce-view', "/wp-includes/js/mce-view$suffix.js", array( 'shortcode', 'jquery', 'media-views', 'media-audiovideo' ), false, 1 );
Index: tests/qunit/index.html
===================================================================
--- tests/qunit/index.html	(revision 46374)
+++ tests/qunit/index.html	(working copy)
@@ -44,8 +44,9 @@
 		</script>
 		<script src="../../build/wp-includes/js/mediaelement/mediaelement-and-player.min.js"></script>
 		<script src="../../build/wp-includes/js/mediaelement/wp-mediaelement.js"></script>
+		<script src="../../build/wp-includes/js/dist/i18n.js"></script>
 		<script>
-			window._wpMediaViewsL10n = {"url":"URL","addMedia":"Add Media","search":"Search","select":"Select","cancel":"Cancel","update":"Update","replace":"Replace","remove":"Remove","back":"Back","selected":"%d selected","dragInfo":"Drag and drop to reorder media files.","uploadFilesTitle":"Upload Files","uploadImagesTitle":"Upload Images","mediaLibraryTitle":"Media Library","insertMediaTitle":"Add Media","createNewGallery":"Create a new gallery","createNewPlaylist":"Create a new playlist","createNewVideoPlaylist":"Create a new video playlist","returnToLibrary":"\u2190 Return to library","allMediaItems":"All media items","allDates":"All dates","noItemsFound":"No items found.","insertIntoPost":"Insert into post","unattached":"Unattached","mine":"Mine","trash":"Trash","uploadedToThisPost":"Uploaded to this post","warnDelete":"You are about to permanently delete this item from your site.\nThis action cannot be undone.\n 'Cancel' to stop, 'OK' to delete.","warnBulkDelete":"You are about to permanently delete these items from your site.\nThis action cannot be undone.\n 'Cancel' to stop, 'OK' to delete.","warnBulkTrash":"You are about to trash these items.\n  'Cancel' to stop, 'OK' to delete.","bulkSelect":"Bulk Select","trashSelected":"Move to Trash","restoreSelected":"Restore from Trash","deletePermanently":"Delete Permanently","apply":"Apply","filterByDate":"Filter by date","filterByType":"Filter by type","searchMediaLabel":"Search Media","searchMediaPlaceholder":"Search media items...","noMedia":"No media files found.","attachmentDetails":"Attachment Details","insertFromUrlTitle":"Insert from URL","setFeaturedImageTitle":"Featured Image","setFeaturedImage":"Set featured image","createGalleryTitle":"Create Gallery","editGalleryTitle":"Edit Gallery","cancelGalleryTitle":"\u2190 Cancel Gallery","insertGallery":"Insert gallery","updateGallery":"Update gallery","addToGallery":"Add to gallery","addToGalleryTitle":"Add to Gallery","reverseOrder":"Reverse order","imageDetailsTitle":"Image Details","imageReplaceTitle":"Replace Image","imageDetailsCancel":"Cancel Edit","editImage":"Edit Image","chooseImage":"Choose Image","selectAndCrop":"Select and Crop","skipCropping":"Skip Cropping","cropImage":"Crop Image","cropYourImage":"Crop your image","cropping":"Cropping\u2026","suggestedDimensions":"Suggested image dimensions: %1$s by %2$s pixels.","cropError":"There has been an error cropping your image.","audioDetailsTitle":"Audio Details","audioReplaceTitle":"Replace Audio","audioAddSourceTitle":"Add Audio Source","audioDetailsCancel":"Cancel Edit","videoDetailsTitle":"Video Details","videoReplaceTitle":"Replace Video","videoAddSourceTitle":"Add Video Source","videoDetailsCancel":"Cancel Edit","videoSelectPosterImageTitle":"Select Poster Image","videoAddTrackTitle":"Add Subtitles","playlistDragInfo":"Drag and drop to reorder tracks.","createPlaylistTitle":"Create Audio Playlist","editPlaylistTitle":"Edit Audio Playlist","cancelPlaylistTitle":"\u2190 Cancel Audio Playlist","insertPlaylist":"Insert audio playlist","updatePlaylist":"Update audio playlist","addToPlaylist":"Add to audio playlist","addToPlaylistTitle":"Add to Audio Playlist","videoPlaylistDragInfo":"Drag and drop to reorder videos.","createVideoPlaylistTitle":"Create Video Playlist","editVideoPlaylistTitle":"Edit Video Playlist","cancelVideoPlaylistTitle":"\u2190 Cancel Video Playlist","insertVideoPlaylist":"Insert video playlist","updateVideoPlaylist":"Update video playlist","addToVideoPlaylist":"Add to video playlist","addToVideoPlaylistTitle":"Add to Video Playlist","settings":{"tabs":[],"tabUrl":"http:\/\/src.wordpress-develop.test\/wp-admin\/media-upload.php?chromeless=1","mimeTypes":{"image":"Images","audio":"Audio","video":"Video"},"captions":true,"nonce":{"sendToEditor":"68dd6db760"},"post":{"id":0},"defaultProps":{"link":"none","align":"","size":""},"attachmentCounts":{"audio":1,"video":1},"oEmbedProxyUrl":"http:\/\/src.wordpress-develop.test\/wp-json\/oembed\/1.0\/proxy","embedExts":["mp3","ogg","flac","m4a","wav","mp4","m4v","webm","ogv","flv"],"embedMimes":{"mp3":"audio\/mpeg","ogg":"audio\/ogg","flac":"audio\/flac","m4a":"audio\/mpeg","wav":"audio\/wav","mp4":"video\/mp4","m4v":"video\/mp4","webm":"video\/webm","ogv":"video\/ogg","flv":"video\/x-flv"},"contentWidth":640,"months":[{"year":"2018","month":"11","text":"November 2018"},{"year":"2018","month":"10","text":"October 2018"},{"year":"2018","month":"7","text":"July 2018"},{"year":"2014","month":"1","text":"January 2014"},{"year":"2013","month":"12","text":"December 2013"},{"year":"2013","month":"9","text":"September 2013"},{"year":"2013","month":"4","text":"April 2013"},{"year":"2013","month":"3","text":"March 2013"},{"year":"2012","month":"7","text":"July 2012"},{"year":"2012","month":"6","text":"June 2012"},{"year":"2011","month":"7","text":"July 2011"},{"year":"2011","month":"1","text":"January 2011"}],"mediaTrash":0}};
+			window._wpMediaViewsL10n = {"mediaFrameDefaultTitle":"Media","url":"URL","addMedia":"Add Media","search":"Search","select":"Select","cancel":"Cancel","update":"Update","replace":"Replace","remove":"Remove","back":"Back","selected":"%d selected","dragInfo":"Drag and drop to reorder media files.","uploadFilesTitle":"Upload Files","uploadImagesTitle":"Upload Images","mediaLibraryTitle":"Media Library","insertMediaTitle":"Add Media","createNewGallery":"Create a new gallery","createNewPlaylist":"Create a new playlist","createNewVideoPlaylist":"Create a new video playlist","returnToLibrary":"\u2190 Return to library","allMediaItems":"All media items","allDates":"All dates","noItemsFound":"No items found.","insertIntoPost":"Insert into post","unattached":"Unattached","mine":"Mine","trash":"Trash","uploadedToThisPost":"Uploaded to this post","warnDelete":"You are about to permanently delete this item from your site.\nThis action cannot be undone.\n 'Cancel' to stop, 'OK' to delete.","warnBulkDelete":"You are about to permanently delete these items from your site.\nThis action cannot be undone.\n 'Cancel' to stop, 'OK' to delete.","warnBulkTrash":"You are about to trash these items.\n  'Cancel' to stop, 'OK' to delete.","bulkSelect":"Bulk Select","trashSelected":"Move to Trash","restoreSelected":"Restore from Trash","deletePermanently":"Delete Permanently","apply":"Apply","filterByDate":"Filter by date","filterByType":"Filter by type","searchMediaLabel":"Search Media","searchMediaPlaceholder":"Search media items...","mediaFound":"Number of media items found: %d","mediaFoundHasMoreResults":"Number of media items displayed: %d. Scroll the page for more results.","noMedia":"No media items found.","noMediaTryNewSearch":"No media items found. Try a different search.","attachmentDetails":"Attachment Details","insertFromUrlTitle":"Insert from URL","setFeaturedImageTitle":"Featured Image","setFeaturedImage":"Set featured image","createGalleryTitle":"Create Gallery","editGalleryTitle":"Edit Gallery","cancelGalleryTitle":"\u2190 Cancel Gallery","insertGallery":"Insert gallery","updateGallery":"Update gallery","addToGallery":"Add to gallery","addToGalleryTitle":"Add to Gallery","reverseOrder":"Reverse order","imageDetailsTitle":"Image Details","imageReplaceTitle":"Replace Image","imageDetailsCancel":"Cancel Edit","editImage":"Edit Image","chooseImage":"Choose Image","selectAndCrop":"Select and Crop","skipCropping":"Skip Cropping","cropImage":"Crop Image","cropYourImage":"Crop your image","cropping":"Cropping\u2026","suggestedDimensions":"Suggested image dimensions: %1$s by %2$s pixels.","cropError":"There has been an error cropping your image.","audioDetailsTitle":"Audio Details","audioReplaceTitle":"Replace Audio","audioAddSourceTitle":"Add Audio Source","audioDetailsCancel":"Cancel Edit","videoDetailsTitle":"Video Details","videoReplaceTitle":"Replace Video","videoAddSourceTitle":"Add Video Source","videoDetailsCancel":"Cancel Edit","videoSelectPosterImageTitle":"Select Poster Image","videoAddTrackTitle":"Add Subtitles","playlistDragInfo":"Drag and drop to reorder tracks.","createPlaylistTitle":"Create Audio Playlist","editPlaylistTitle":"Edit Audio Playlist","cancelPlaylistTitle":"\u2190 Cancel Audio Playlist","insertPlaylist":"Insert audio playlist","updatePlaylist":"Update audio playlist","addToPlaylist":"Add to audio playlist","addToPlaylistTitle":"Add to Audio Playlist","videoPlaylistDragInfo":"Drag and drop to reorder videos.","createVideoPlaylistTitle":"Create Video Playlist","editVideoPlaylistTitle":"Edit Video Playlist","cancelVideoPlaylistTitle":"\u2190 Cancel Video Playlist","insertVideoPlaylist":"Insert video playlist","updateVideoPlaylist":"Update video playlist","addToVideoPlaylist":"Add to video playlist","addToVideoPlaylistTitle":"Add to Video Playlist","filterAttachments":"Filter Media","attachmentsList":"Media list","settings":{"tabs":[],"tabUrl":"http:\/\/build.wordpress-develop.test\/wp-admin\/media-upload.php?chromeless=1","mimeTypes":{"image":"Images","audio":"Audio","video":"Video","application\/msword,application\/vnd.openxmlformats-officedocument.wordprocessingml.document,application\/vnd.ms-word.document.macroEnabled.12,application\/vnd.ms-word.template.macroEnabled.12,application\/vnd.oasis.opendocument.text,application\/vnd.apple.pages,application\/pdf,application\/vnd.ms-xpsdocument,application\/oxps,application\/rtf,application\/wordperfect,application\/octet-stream":"Documents","application\/vnd.apple.numbers,application\/vnd.oasis.opendocument.spreadsheet,application\/vnd.ms-excel,application\/vnd.openxmlformats-officedocument.spreadsheetml.sheet,application\/vnd.ms-excel.sheet.macroEnabled.12,application\/vnd.ms-excel.sheet.binary.macroEnabled.12":"Spreadsheets","application\/x-gzip,application\/rar,application\/x-tar,application\/zip,application\/x-7z-compressed":"Archives"},"captions":true,"nonce":{"sendToEditor":"078fccea44"},"post":{"id":7734,"nonce":"b81d45d05c","featuredImageId":-1},"defaultProps":{"link":"","align":"","size":""},"attachmentCounts":{"audio":1,"video":1},"oEmbedProxyUrl":"http:\/\/build.wordpress-develop.test\/wp-json\/oembed\/1.0\/proxy","embedExts":["mp3","ogg","flac","m4a","wav","mp4","m4v","webm","ogv","flv"],"embedMimes":{"mp3":"audio\/mpeg","ogg":"audio\/ogg","flac":"audio\/flac","m4a":"audio\/mpeg","wav":"audio\/wav","mp4":"video\/mp4","m4v":"video\/mp4","webm":"video\/webm","ogv":"video\/ogg","flv":"video\/x-flv"},"contentWidth":580,"months":[{"year":"2019","month":"10","text":"October 2019"},{"year":"2019","month":"9","text":"September 2019"},{"year":"2019","month":"7","text":"July 2019"},{"year":"2019","month":"6","text":"June 2019"},{"year":"2014","month":"1","text":"January 2014"},{"year":"2013","month":"12","text":"December 2013"},{"year":"2013","month":"9","text":"September 2013"},{"year":"2013","month":"4","text":"April 2013"},{"year":"2013","month":"3","text":"March 2013"},{"year":"2012","month":"7","text":"July 2012"},{"year":"2012","month":"6","text":"June 2012"},{"year":"2011","month":"7","text":"July 2011"},{"year":"2011","month":"1","text":"January 2011"}],"mediaTrash":0}};
 		</script>
 		<script src="../../build/wp-includes/js/media-views.js"></script>
 		<script src="../../build/wp-includes/js/media-editor.js"></script>