diff --git a/src/js/_enqueues/vendor/thickbox/thickbox.css b/src/js/_enqueues/vendor/thickbox/thickbox.css
index e642bfdcbf..c884f03fbe 100644
--- a/src/js/_enqueues/vendor/thickbox/thickbox.css
+++ b/src/js/_enqueues/vendor/thickbox/thickbox.css
@@ -136,7 +136,7 @@
 .tb-close-icon:before {
 	content: "\f158";
 	font: normal 20px/29px dashicons;
-	speak: none;
+	speak: never;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
 }
diff --git a/src/wp-admin/css/admin-menu.css b/src/wp-admin/css/admin-menu.css
index d18bf68724..f2f9887df0 100644
--- a/src/wp-admin/css/admin-menu.css
+++ b/src/wp-admin/css/admin-menu.css
@@ -49,7 +49,7 @@
 .icon16:before {
 	color: #82878c; /* same as new icons */
 	font: normal 20px/1 dashicons;
-	speak: none;
+	speak: never;
 	padding: 6px 0;
 	height: 34px;
 	width: 20px;
@@ -591,7 +591,7 @@ ul#adminmenu > li.current > a.current:after {
 	top: 7px;
 	text-align: center;
 	font: normal 20px/1 dashicons !important;
-	speak: none;
+	speak: never;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
 }
diff --git a/src/wp-admin/css/common.css b/src/wp-admin/css/common.css
index 367b659ee6..7c04b204b6 100644
--- a/src/wp-admin/css/common.css
+++ b/src/wp-admin/css/common.css
@@ -791,7 +791,7 @@ img.emoji {
 	content: "\f153";
 	display: block;
 	font: normal 16px/20px dashicons;
-	speak: none;
+	speak: never;
 	height: 20px;
 	text-align: center;
 	width: 20px;
@@ -1638,7 +1638,7 @@ form.upgrade .hint {
 	.button.installing:before,
 	.button.installed:before,
 	.update-message p:before {
-		speak: none;
+		speak: never;
 	}
 }
 
@@ -1729,7 +1729,7 @@ form.upgrade .hint {
 	right: 0;
 	content: "\f140";
 	font: normal 20px/1 dashicons;
-	speak: none;
+	speak: never;
 	display: inline-block;
 	padding: 0 5px 0 0;
 	bottom: 2px;
@@ -3019,7 +3019,7 @@ div.action-links {
 .plugin-details-modal #TB_closeWindowButton:after {
 	content: "\f335";
 	font: normal 32px/29px 'dashicons';
-	speak: none;
+	speak: never;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
 }
@@ -3047,7 +3047,7 @@ img {
 	content: "\f142";
 	display: inline-block;
 	font: normal 20px/1 dashicons;
-	speak: none;
+	speak: never;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
 	text-decoration: none;
@@ -3400,7 +3400,7 @@ img {
 .accordion-section-title:after {
 	content: "\f140";
 	font: normal 20px/1 dashicons;
-	speak: none;
+	speak: never;
 	display: block;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
diff --git a/src/wp-admin/css/customize-controls.css b/src/wp-admin/css/customize-controls.css
index 3738f224b1..491a7807e8 100644
--- a/src/wp-admin/css/customize-controls.css
+++ b/src/wp-admin/css/customize-controls.css
@@ -1283,7 +1283,7 @@ p.customize-section-description {
 .customize-control .dropdown-arrow:after {
 	content: "\f140";
 	font: normal 20px/1 dashicons;
-	speak: none;
+	speak: never;
 	display: block;
 	padding: 0;
 	text-indent: 0;
diff --git a/src/wp-admin/css/customize-nav-menus.css b/src/wp-admin/css/customize-nav-menus.css
index dc4e518cad..02c029005b 100644
--- a/src/wp-admin/css/customize-nav-menus.css
+++ b/src/wp-admin/css/customize-nav-menus.css
@@ -322,7 +322,7 @@
 	content: "\f140";
 	display: block;
 	padding: 1px 2px 1px 0px;
-	speak: none;
+	speak: never;
 	border-radius: 50%;
 	color: #72777c;
 	font: normal 20px/1 dashicons;
diff --git a/src/wp-admin/css/dashboard.css b/src/wp-admin/css/dashboard.css
index c8d0b1592a..6edfda5f93 100644
--- a/src/wp-admin/css/dashboard.css
+++ b/src/wp-admin/css/dashboard.css
@@ -231,7 +231,7 @@
 #dashboard_right_now .search-engines-info:before {
 	color: #606a73;
 	font: normal 20px/1 dashicons;
-	speak: none;
+	speak: never;
 	display: inline-block;
 	padding: 0 10px 0 0;
 	position: relative;
diff --git a/src/wp-admin/css/edit.css b/src/wp-admin/css/edit.css
index ceb9e6545b..29a982a6c8 100644
--- a/src/wp-admin/css/edit.css
+++ b/src/wp-admin/css/edit.css
@@ -475,7 +475,7 @@ form#tags-filter {
 #post-body .misc-pub-response-to:before,
 #post-body .misc-pub-comment-status:before {
 	font: normal 20px/1 dashicons;
-	speak: none;
+	speak: never;
 	display: inline-block;
 	margin-left: -1px;
 	padding-right: 3px;
@@ -976,7 +976,7 @@ strong.privacy-policy-tutorial {
 	margin-right: 7px;
 	color: #ddd;
 	font: normal 20px/1 dashicons;
-	speak: none;
+	speak: never;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
 }
diff --git a/src/wp-admin/css/forms.css b/src/wp-admin/css/forms.css
index 462b4bdec9..afbff9d89e 100644
--- a/src/wp-admin/css/forms.css
+++ b/src/wp-admin/css/forms.css
@@ -172,7 +172,7 @@ input[type="radio"]:checked::before {
 	display: inline-block;
 	vertical-align: middle;
 	width: 1rem;
-	speak: none;
+	speak: never;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
 }
@@ -1326,7 +1326,7 @@ table.form-table td .updated p {
 	display: inline-block;
 	font: normal 20px/1 dashicons;
 	margin: 3px 5px 0 -2px;
-	speak: none;
+	speak: never;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
 	vertical-align: top;
diff --git a/src/wp-admin/css/list-tables.css b/src/wp-admin/css/list-tables.css
index c015d63d94..f2287d7c44 100644
--- a/src/wp-admin/css/list-tables.css
+++ b/src/wp-admin/css/list-tables.css
@@ -268,7 +268,7 @@ th .comment-grey-bubble {
 th .comment-grey-bubble:before {
 	content: "\f101";
 	font: normal 20px/.5 dashicons;
-	speak: none;
+	speak: never;
 	display: inline-block;
 	padding: 0;
 	top: 4px;
@@ -450,7 +450,7 @@ table.media .column-title .filename {
 .sorting-indicator:before {
 	content: "\f142";
 	font: normal 20px/1 dashicons;
-	speak: none;
+	speak: never;
 	display: inline-block;
 	padding: 0;
 	top: -4px;
@@ -522,7 +522,7 @@ th.asc a:focus span.sorting-indicator:before {
 	line-height: 1;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
-	speak: none;
+	speak: never;
 }
 
 .wp-list-table .is-expanded .toggle-row:before {
@@ -541,7 +541,7 @@ th.asc a:focus span.sorting-indicator:before {
 	content: "\f160";
 	display: inline-block;
 	font: normal 20px/1 dashicons;
-	speak: none;
+	speak: never;
 	vertical-align: middle;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
@@ -709,7 +709,7 @@ th.asc a:focus span.sorting-indicator {
 	color: #b4b9be;
 	display: inline-block;
 	font: normal 20px/1 dashicons;
-	speak: none;
+	speak: never;
 	vertical-align: middle;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
@@ -1312,7 +1312,7 @@ ul.cat-checklist {
 	display: inline-block;
 	font: normal 20px/1 dashicons;
 	margin: 3px 5px 0 -2px;
-	speak: none;
+	speak: never;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
 	vertical-align: top;
@@ -1522,7 +1522,7 @@ div.action-links,
 
 .plugin-card .column-compatibility span:before {
 	font: normal 20px/.5 dashicons;
-	speak: none;
+	speak: never;
 	display: inline-block;
 	padding: 0;
 	top: 4px;
diff --git a/src/wp-admin/css/media.css b/src/wp-admin/css/media.css
index 7c09be69c9..5116568560 100644
--- a/src/wp-admin/css/media.css
+++ b/src/wp-admin/css/media.css
@@ -321,7 +321,7 @@
 #find-posts-close:before {
 	font: normal 20px/36px dashicons;
 	vertical-align: top;
-	speak: none;
+	speak: never;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
 	content: "\f158";
@@ -958,7 +958,7 @@ border color while dragging a file over the uploader drop area */
 .imgedit-menu .button:before {
 	font: normal 16px/1 dashicons;
 	margin-right: 8px;
-	speak: none;
+	speak: never;
 	vertical-align: middle;
 	position: relative;
 	top: -2px;
diff --git a/src/wp-admin/css/revisions.css b/src/wp-admin/css/revisions.css
index 4b3a6e48d8..fb4b8a5ea7 100644
--- a/src/wp-admin/css/revisions.css
+++ b/src/wp-admin/css/revisions.css
@@ -491,7 +491,7 @@ div.revisions-controls > .wp-slider > .ui-slider-handle {
 	color: #555;
 	content: "\f229";
 	font: normal 18px/1 dashicons;
-	speak: none;
+	speak: never;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
 }
diff --git a/src/wp-admin/css/themes.css b/src/wp-admin/css/themes.css
index 7cd302c7df..e56533544b 100644
--- a/src/wp-admin/css/themes.css
+++ b/src/wp-admin/css/themes.css
@@ -1599,7 +1599,7 @@ body.full-overlay-active {
 	content: "\f148";
 	background: #eee;
 	font: normal 20px/1 dashicons;
-	speak: none;
+	speak: never;
 	padding: 0;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
@@ -1975,6 +1975,6 @@ body.full-overlay-active {
 	.theme-info .updating-message:before,
 	.theme-info .updated-message:before,
 	.theme-install.updating-message:before {
-		speak: none;
+		speak: never;
 	}
 }
diff --git a/src/wp-content/themes/twentyfifteen/genericons/genericons.css b/src/wp-content/themes/twentyfifteen/genericons/genericons.css
index 36f02a3453..f1056ede1d 100644
--- a/src/wp-content/themes/twentyfifteen/genericons/genericons.css
+++ b/src/wp-content/themes/twentyfifteen/genericons/genericons.css
@@ -52,7 +52,7 @@
 	text-transform: none;
 	-moz-osx-font-smoothing: grayscale;
 	-webkit-font-smoothing: antialiased;
-	speak: none;
+	speak: never;
 }
 
 
diff --git a/src/wp-content/themes/twentyfifteen/style.css b/src/wp-content/themes/twentyfifteen/style.css
index 5742f86b3f..4aee76388c 100644
--- a/src/wp-content/themes/twentyfifteen/style.css
+++ b/src/wp-content/themes/twentyfifteen/style.css
@@ -195,7 +195,7 @@ a img {
 	font-weight: normal;
 	font-variant: normal;
 	line-height: 1;
-	speak: none;
+	speak: never;
 	text-align: center;
 	text-decoration: inherit;
 	text-transform: none;
diff --git a/src/wp-content/themes/twentysixteen/genericons/genericons.css b/src/wp-content/themes/twentysixteen/genericons/genericons.css
index 87cf754e18..5b25675aaf 100644
--- a/src/wp-content/themes/twentysixteen/genericons/genericons.css
+++ b/src/wp-content/themes/twentysixteen/genericons/genericons.css
@@ -54,7 +54,7 @@
 	text-transform: none;
 	-moz-osx-font-smoothing: grayscale;
 	-webkit-font-smoothing: antialiased;
-	speak: none;
+	speak: never;
 }
 
 
diff --git a/src/wp-content/themes/twentysixteen/style.css b/src/wp-content/themes/twentysixteen/style.css
index 5166e6f047..2eb65bcdc2 100644
--- a/src/wp-content/themes/twentysixteen/style.css
+++ b/src/wp-content/themes/twentysixteen/style.css
@@ -288,7 +288,7 @@ optgroup {
 	font-variant: normal;
 	font-weight: normal;
 	line-height: 1;
-	speak: none;
+	speak: never;
 	text-align: center;
 	text-decoration: inherit;
 	text-transform: none;
diff --git a/src/wp-includes/css/admin-bar.css b/src/wp-includes/css/admin-bar.css
index 4b86ce70e5..f3e16d95d7 100644
--- a/src/wp-includes/css/admin-bar.css
+++ b/src/wp-includes/css/admin-bar.css
@@ -228,7 +228,7 @@ html:lang(he-il) .rtl #wpadminbar * {
 	position: relative;
 	float: left;
 	font: normal 20px/1 dashicons;
-	speak: none;
+	speak: never;
 	padding: 4px 0;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
@@ -305,7 +305,7 @@ html:lang(he-il) .rtl #wpadminbar * {
 #wpadminbar .ab-top-secondary .menupop .menupop > .ab-item:before {
 	position: absolute;
 	font: normal 17px/1 dashicons;
-	speak: none;
+	speak: never;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
 }
@@ -505,7 +505,7 @@ html:lang(he-il) .rtl #wpadminbar * {
 	display: inline-block;
 	vertical-align: middle;
 	font: normal 16px/1 dashicons !important;
-	speak: none;
+	speak: never;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
 	color: #eee;
@@ -611,7 +611,7 @@ html:lang(he-il) .rtl #wpadminbar * {
 	z-index: 20;
 	font: normal 20px/1 dashicons !important;
 	content: "\f179";
-	speak: none;
+	speak: never;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
 }
@@ -841,7 +841,7 @@ html:lang(he-il) .rtl #wpadminbar * {
 		display: block;
 		text-indent: 0;
 		font: normal 32px/1 dashicons;
-		speak: none;
+		speak: never;
 		top: 7px;
 		width: 52px;
 		text-align: center;
diff --git a/src/wp-includes/css/editor.css b/src/wp-includes/css/editor.css
index 1ca4387d77..e8d396d5f5 100644
--- a/src/wp-includes/css/editor.css
+++ b/src/wp-includes/css/editor.css
@@ -907,7 +907,7 @@ i.mce-i-remove {
 	font: normal 20px/1 dashicons;
 	padding: 0;
 	vertical-align: top;
-	speak: none;
+	speak: never;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
 	margin-left: -2px;
@@ -917,7 +917,7 @@ i.mce-i-remove {
 .qt-dfw {
 	font: normal 20px/1 dashicons;
 	vertical-align: top;
-	speak: none;
+	speak: never;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
 }
@@ -1214,7 +1214,7 @@ i.mce-i-wp_code:before {
 
 .wp-media-buttons .add_media span.wp-media-buttons-icon:before {
 	font: normal 18px/1 dashicons;
-	speak: none;
+	speak: never;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
 }
@@ -1436,7 +1436,7 @@ i.mce-i-wp_code:before {
 #wp-link-close:before {
 	font: normal 20px/36px dashicons;
 	vertical-align: top;
-	speak: none;
+	speak: never;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
 	width: 36px;
diff --git a/src/wp-includes/css/jquery-ui-dialog.css b/src/wp-includes/css/jquery-ui-dialog.css
index c89ec4d7c2..fca2e1438e 100644
--- a/src/wp-includes/css/jquery-ui-dialog.css
+++ b/src/wp-includes/css/jquery-ui-dialog.css
@@ -296,7 +296,7 @@
 .ui-dialog-titlebar-close:before {
 	font: normal 20px/1 dashicons;
 	vertical-align: top;
-	speak: none;
+	speak: never;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
 	line-height: 1.8;
diff --git a/src/wp-includes/css/media-views.css b/src/wp-includes/css/media-views.css
index f07617cf86..ce5c8e84e2 100644
--- a/src/wp-includes/css/media-views.css
+++ b/src/wp-includes/css/media-views.css
@@ -254,7 +254,7 @@
 .media-modal-close .media-modal-icon:before {
 	content: "\f158";
 	font: normal 20px/1 dashicons;
-	speak: none;
+	speak: never;
 	vertical-align: middle;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
@@ -2173,7 +2173,7 @@
 
 .image-details .advanced-toggle:after {
 	font: normal 20px/1 dashicons;
-	speak: none;
+	speak: never;
 	vertical-align: top;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
diff --git a/src/wp-includes/css/wp-auth-check.css b/src/wp-includes/css/wp-auth-check.css
index 466260ee67..f22008520e 100644
--- a/src/wp-includes/css/wp-auth-check.css
+++ b/src/wp-includes/css/wp-auth-check.css
@@ -96,7 +96,7 @@
 #wp-auth-check-wrap .wp-auth-check-close:before {
 	content: "\f158";
 	font: normal 20px/22px dashicons;
-	speak: none;
+	speak: never;
 	-webkit-font-smoothing: antialiased !important;
 	-moz-osx-font-smoothing: grayscale;
 }
diff --git a/src/wp-includes/css/wp-pointer.css b/src/wp-includes/css/wp-pointer.css
index 09acb8622f..425ec85b07 100644
--- a/src/wp-includes/css/wp-pointer.css
+++ b/src/wp-includes/css/wp-pointer.css
@@ -28,7 +28,7 @@
 	position: absolute;
 	top: 8px;
 	left: 15px;
-	speak: none;
+	speak: never;
 	text-align: center;
 	width: 32px;
 	height: 32px;
@@ -68,7 +68,7 @@
 	content: "\f153";
 	display: block !important;
 	font: normal 16px/1 dashicons;
-	speak: none;
+	speak: never;
 	margin: 1px 0;
 	text-align: center;
 	-webkit-font-smoothing: antialiased !important;