diff --git a/src/wp-admin/css/common.css b/src/wp-admin/css/common.css
index 0298dbdcb8..1803d96fdc 100644
--- a/src/wp-admin/css/common.css
+++ b/src/wp-admin/css/common.css
@@ -1516,7 +1516,7 @@ div.error {
 .installed p:before,
 .button.updated-message:before {
 	color: #79ba49;
-	content: '\f147';
+	content: "\f147";
 }
 
 /* Error icon. */
@@ -3134,7 +3134,7 @@ img {
 
 /* Styles for folder indicators/depth */
 .tree-folder .tree-folder::after {
-	content: ' ';
+	content: "";
 	display: block;
 	position: absolute;
 	left: 2px;
@@ -3143,7 +3143,7 @@ img {
 	bottom: 10px;
 }
 .tree-folder > li::before {
-	content: ' ';
+	content: "";
 	position: absolute;
 	display: block;
 	border-left: 1px solid #ccc;
@@ -3154,7 +3154,7 @@ img {
 	border-bottom: 1px solid #ccc;
 }
 .tree-folder > li::after {
-	content: ' ';
+	content: "";
 	position: absolute;
 	display: block;
 	border-left: 1px solid #ccc;
@@ -3952,7 +3952,7 @@ img {
 		margin: 5px 0;
 	}
 	.options-media-php label[for*="_size_h"]:before {
-		content: '';
+		content: "";
 		display: block;
 	}
 	.options-media-php br {
diff --git a/src/wp-admin/css/customize-controls.css b/src/wp-admin/css/customize-controls.css
index b595e2a8da..b20c13760a 100644
--- a/src/wp-admin/css/customize-controls.css
+++ b/src/wp-admin/css/customize-controls.css
@@ -1444,7 +1444,7 @@ p.customize-section-description {
 }
 
 .customize-control-header .header-view.selected:after {
-	content: '';
+	content: "";
 	position: absolute;
 	height: auto;
 	top: 0;
diff --git a/src/wp-admin/css/edit.css b/src/wp-admin/css/edit.css
index 5f49475f5f..9c7c257f53 100644
--- a/src/wp-admin/css/edit.css
+++ b/src/wp-admin/css/edit.css
@@ -214,7 +214,7 @@ ul.category-tabs li,
 
 /* Back-compat for pre-4.4 */
 #category-adder h4 {
-    margin: 0;
+	margin: 0;
 }
 
 .taxonomy-add-new {
@@ -1122,7 +1122,7 @@ p.popular-tags a {
 }
 
 .comment-ays .comment-content a[href]:after {
-	content: '(' attr( href ) ')';
+	content: "(" attr( href ) ")";
 	display: inline-block;
 	padding: 0 4px;
 	color: #72777C;
@@ -1135,7 +1135,7 @@ p.popular-tags a {
 }
 
 .comment-ays .comment-content p.edit-comment a[href]:after {
-	content: '';
+	content: "";
 	padding: 0;
 }
 
diff --git a/src/wp-admin/css/forms.css b/src/wp-admin/css/forms.css
index 0e499cfc4a..790bb97092 100644
--- a/src/wp-admin/css/forms.css
+++ b/src/wp-admin/css/forms.css
@@ -228,8 +228,8 @@ textarea[readonly] {
 }
 
 ::-moz-placeholder {
-   color: #72777c;
-   opacity: 1;
+	color: #72777c;
+	opacity: 1;
 }
 
 :-ms-input-placeholder {
@@ -252,11 +252,11 @@ textarea[readonly] {
 
 /* Adjust error indicator for password layout */
 .form-table .form-required.user-pass1-wrap.form-invalid td:after {
-	content: '';
+	content: "";
 }
 
 .form-table .form-required.user-pass1-wrap.form-invalid .password-input-wrapper:after {
-	content: '\f534';
+	content: "\f534";
 	font: normal 20px/1 dashicons;
 	color: #dc3232;
 	margin: 0 6px 0 -29px;
@@ -966,8 +966,8 @@ table.form-table td .updated p {
 }
 
 #request-filesystem-credentials-title {
-    font-size: 1.3em;
-    margin: 1em 0;
+	font-size: 1.3em;
+	margin: 1em 0;
 }
 
 .request-filesystem-credentials-form legend {
@@ -1368,7 +1368,7 @@ table.form-table td .updated p {
 }
 
 @media only screen and (max-height: 480px), screen and (max-width: 450px) {
-	/*  Request Credentials / File Editor Warning */
+	/* Request Credentials / File Editor Warning */
 	.request-filesystem-credentials-dialog .notification-dialog,
 	.file-editor-warning .notification-dialog {
 		width: 100%;
diff --git a/src/wp-admin/css/ie.css b/src/wp-admin/css/ie.css
index e3dc91391e..ceb02a8594 100644
--- a/src/wp-admin/css/ie.css
+++ b/src/wp-admin/css/ie.css
@@ -639,7 +639,7 @@ input[type="password"],
 .mce-btn i.mce-i-wp_page,
 .mce-btn i.mce-i-hr,
 .mce-close {
-	font-family: 'tinymce', Arial;
+	font-family: tinymce, Arial;
 	font-style: normal;
 	font-weight: 400;
 	font-variant: normal;
@@ -650,12 +650,12 @@ input[type="password"],
 
 .mce-btn i.mce-i-wp_fullscreen,
 .qt-fullscreen {
-	-ie7-icon: '\e023';
+	-ie7-icon: "\e023";
 }
 
 .mce-btn i.mce-i-wp_more,
 .mce-btn i.mce-i-wp_page {
-	-ie7-icon: '\e027';
+	-ie7-icon: "\e027";
 }
 
 .mce-btn i.mce-i-wp_adv {
@@ -664,7 +664,7 @@ input[type="password"],
 
 .mce-btn i.mce-i-help,
 .mce-btn i.mce-i-wp_help {
-	-ie7-icon: '\e016';
+	-ie7-icon: "\e016";
 }
 
 
diff --git a/src/wp-admin/css/themes.css b/src/wp-admin/css/themes.css
index eece216a98..0427328fb3 100644
--- a/src/wp-admin/css/themes.css
+++ b/src/wp-admin/css/themes.css
@@ -439,8 +439,8 @@ body.js .theme-browser.search-loading {
 .theme-overlay .theme-header .close:focus,
 .theme-overlay .theme-header .right:focus,
 .theme-overlay .theme-header .left:focus {
-    box-shadow: none;
-    outline: none;
+	box-shadow: none;
+	outline: none;
 }
 
 .theme-overlay .theme-header .left.disabled,
@@ -1002,7 +1002,7 @@ body.folded .theme-browser ~ .theme-overlay .theme-wrap {
 }
 
 .theme-install.updated-message:before {
-	content: '';
+	content: "";
 }
 
 .theme-install-php .wp-filter {
@@ -1532,8 +1532,8 @@ body.full-overlay-active {
 
 .wp-full-overlay .collapse-sidebar:hover .collapse-sidebar-arrow,
 .wp-full-overlay .collapse-sidebar:focus .collapse-sidebar-arrow {
-    box-shadow:
-    	0 0 0 1px #5b9dd9,
+	box-shadow:
+		0 0 0 1px #5b9dd9,
 		0 0 2px 1px rgba(30, 140, 190, .8);
 }
 
@@ -1564,7 +1564,7 @@ body.full-overlay-active {
 .wp-full-overlay.collapsed .collapse-sidebar-arrow:before,
 .rtl .wp-full-overlay .collapse-sidebar-arrow:before {
 	-webkit-transform: rotate(180.001deg);
-	transform: rotate(180.001deg); /* Firefox: promoting to its own layer to trigger anti-aliasing  */
+	transform: rotate(180.001deg); /* Firefox: promoting to its own layer to trigger anti-aliasing */
 }
 
 .rtl .wp-full-overlay.collapsed .collapse-sidebar-arrow:before {
diff --git a/src/wp-includes/css/editor.css b/src/wp-includes/css/editor.css
index 0e042cf67f..51d9a9633e 100644
--- a/src/wp-includes/css/editor.css
+++ b/src/wp-includes/css/editor.css
@@ -189,7 +189,7 @@ div.mce-tab:focus {
 
 .mce-window .wp-help-th-center td:nth-child(odd),
 .mce-window .wp-help-th-center th:nth-child(odd) {
-    text-align: center;
+	text-align: center;
 }
 
 /* TinyMCE menus */
@@ -507,11 +507,11 @@ div.mce-path {
 
 /* mce listbox */
 .mce-toolbar .mce-btn-group .mce-btn.mce-listbox {
-    border-radius: 0;
-    direction: ltr;
-    background: #fff;
-    border: 1px solid #ddd;
-    box-shadow: inset 0 1px 1px -1px rgba(0, 0, 0, .2);
+	border-radius: 0;
+	direction: ltr;
+	background: #fff;
+	border: 1px solid #ddd;
+	box-shadow: inset 0 1px 1px -1px rgba(0, 0, 0, .2);
 }
 
 .mce-toolbar .mce-btn-group .mce-btn.mce-listbox:hover,
@@ -575,7 +575,7 @@ div.mce-path {
 }
 
 .mce-menu .mce-menu-item.mce-disabled:hover {
-    background: #ccc;
+	background: #ccc;
 }
 
 /* Menubar */
@@ -776,11 +776,11 @@ div.mce-menu .mce-menu-item-sep,
 
 /* TinyMCE icons */
 .mce-ico {
-	font-family: 'tinymce', Arial;
+	font-family: tinymce, Arial;
 }
 
 .mce-btn-small .mce-ico {
-    font-family: 'tinymce-small', Arial;
+	font-family: tinymce-small, Arial;
 }
 
 .mce-toolbar .mce-ico {
@@ -1819,7 +1819,7 @@ div.wp-link-input input {
 }
 
 html:lang(he-il) .rtl .wp-switch-editor,
-html:lang(he-il) .rtl .quicktags-toolbar input  {
+html:lang(he-il) .rtl .quicktags-toolbar input {
  	font-family: Arial, sans-serif;
 }
 
diff --git a/src/wp-includes/js/tinymce/skins/wordpress/wp-content.css b/src/wp-includes/js/tinymce/skins/wordpress/wp-content.css
index ed00770f00..7e7580fb5a 100644
--- a/src/wp-includes/js/tinymce/skins/wordpress/wp-content.css
+++ b/src/wp-includes/js/tinymce/skins/wordpress/wp-content.css
@@ -6,7 +6,7 @@ html {
 
 html.ios {
 	width: 100px;
-    min-width: 100%;
+	min-width: 100%;
 }
 
 body {
@@ -157,7 +157,7 @@ img[data-mce-selected]::selection {
 }
 
 .mce-content-body img[data-wp-more="nextpage"] {
-    background: transparent url( images/pagebreak.png ) repeat-y scroll center center;
+	background: transparent url( images/pagebreak.png ) repeat-y scroll center center;
 }
 
 /* Styles for formatting the boundaries of anchors and code elements */
@@ -254,7 +254,7 @@ a[data-wplink-url-error]:focus {
 }
 
 a[data-wplink-url-error]:before {
-	content: '';
+	content: "";
 	display: block;
 	position: absolute;
 	top: -2px;
@@ -367,9 +367,9 @@ a[data-wplink-url-error]:before {
 }
 
 .wpview-type-gallery:after {
-    content: '';
+	content: "";
 	display: table;
-    clear: both;
+	clear: both;
 }
 
 .gallery img[data-mce-selected]:focus {
@@ -489,7 +489,7 @@ img.wp-oembed {
 	}
 
 	.mce-content-body img.mce-wp-nextpage {
-    	background-image: url( images/pagebreak-2x.png );
+		background-image: url( images/pagebreak-2x.png );
 		background-size: 1900px 20px;
 	}
 }