diff --git a/wp-admin/edit-form-comment.php b/wp-admin/edit-form-comment.php
index 3d0ebf5104..b2950f77b5 100644
--- a/wp-admin/edit-form-comment.php
+++ b/wp-admin/edit-form-comment.php
@@ -71,7 +71,7 @@ if ( !defined('ABSPATH') )
 
 <div id="postbox-container-1" class="postbox-container">
 <div id="submitdiv" class="stuffbox" >
-<h3><span class='hndle'><?php _e('Status') ?></span></h3>
+<h3><span class="hndle"><?php _e('Status') ?></span></h3>
 <div class="inside">
 <div class="submitbox" id="submitcomment">
 <div id="minor-publishing">
diff --git a/wp-admin/includes/class-wp-list-table.php b/wp-admin/includes/class-wp-list-table.php
index 0e2456380e..53a84ffa52 100644
--- a/wp-admin/includes/class-wp-list-table.php
+++ b/wp-admin/includes/class-wp-list-table.php
@@ -420,7 +420,7 @@ class WP_List_Table {
 
 		$m = isset( $_GET['m'] ) ? (int) $_GET['m'] : 0;
 ?>
-		<select name='m'>
+		<select name="m">
 			<option<?php selected( $m, 0 ); ?> value='0'><?php _e( 'All dates' ); ?></option>
 <?php
 		foreach ( $months as $arc_row ) {
diff --git a/wp-admin/includes/class-wp-media-list-table.php b/wp-admin/includes/class-wp-media-list-table.php
index 9be8f1bc96..828cd8c0f3 100644
--- a/wp-admin/includes/class-wp-media-list-table.php
+++ b/wp-admin/includes/class-wp-media-list-table.php
@@ -207,7 +207,7 @@ class WP_Media_List_Table extends WP_List_Table {
 			$post_owner = ( get_current_user_id() == $post->post_author ) ? 'self' : 'other';
 			$att_title = _draft_or_post_title();
 ?>
-	<tr id='post-<?php echo $post->ID; ?>' class='<?php echo trim( $alt . ' author-' . $post_owner . ' status-' . $post->post_status ); ?>'>
+	<tr id="post-<?php echo $post->ID; ?>" class="<?php echo trim( $alt . ' author-' . $post_owner . ' status-' . $post->post_status ); ?>">
 <?php
 
 list( $columns, $hidden ) = $this->get_column_info();
diff --git a/wp-admin/includes/class-wp-theme-install-list-table.php b/wp-admin/includes/class-wp-theme-install-list-table.php
index ac2d3f9650..1aa131accc 100644
--- a/wp-admin/includes/class-wp-theme-install-list-table.php
+++ b/wp-admin/includes/class-wp-theme-install-list-table.php
@@ -272,7 +272,7 @@ class WP_Theme_Install_List_Table extends WP_Themes_List_Table {
 
 		?>
 		<a class="screenshot install-theme-preview" href="<?php echo esc_url( $preview_url ); ?>" title="<?php echo esc_attr( $preview_title ); ?>">
-			<img src='<?php echo esc_url( $theme->screenshot_url ); ?>' width='150' />
+			<img src="<?php echo esc_url( $theme->screenshot_url ); ?>" width="150" />
 		</a>
 
 		<h3><?php echo $name; ?></h3>
diff --git a/wp-admin/includes/class-wp-users-list-table.php b/wp-admin/includes/class-wp-users-list-table.php
index 3512bd956b..fafa6609e1 100644
--- a/wp-admin/includes/class-wp-users-list-table.php
+++ b/wp-admin/includes/class-wp-users-list-table.php
@@ -208,7 +208,7 @@ class WP_Users_List_Table extends WP_List_Table {
 		<?php if ( current_user_can( 'promote_users' ) ) : ?>
 		<label class="screen-reader-text" for="new_role"><?php _e( 'Change role to&hellip;' ) ?></label>
 		<select name="new_role" id="new_role">
-			<option value=''><?php _e( 'Change role to&hellip;' ) ?></option>
+			<option value=""><?php _e( 'Change role to&hellip;' ) ?></option>
 			<?php wp_dropdown_roles(); ?>
 		</select>
 	<?php
diff --git a/wp-admin/includes/dashboard.php b/wp-admin/includes/dashboard.php
index 27384c9d6a..437d2497bc 100644
--- a/wp-admin/includes/dashboard.php
+++ b/wp-admin/includes/dashboard.php
@@ -186,16 +186,16 @@ function wp_dashboard() {
 
 ?>
 <div id="dashboard-widgets" class="metabox-holder<?php echo $columns_css; ?>">
-	<div id='postbox-container-1' class='postbox-container'>
+	<div id="postbox-container-1" class="postbox-container">
 	<?php do_meta_boxes( $screen->id, 'normal', '' ); ?>
 	</div>
-	<div id='postbox-container-2' class='postbox-container'>
+	<div id="postbox-container-2" class="postbox-container">
 	<?php do_meta_boxes( $screen->id, 'side', '' ); ?>
 	</div>
-	<div id='postbox-container-3' class='postbox-container'>
+	<div id="postbox-container-3" class="postbox-container">
 	<?php do_meta_boxes( $screen->id, 'column3', '' ); ?>
 	</div>
-	<div id='postbox-container-4' class='postbox-container'>
+	<div id="postbox-container-4" class="postbox-container">
 	<?php do_meta_boxes( $screen->id, 'column4', '' ); ?>
 	</div>
 </div>
diff --git a/wp-admin/includes/media.php b/wp-admin/includes/media.php
index cda0638a54..69b790d053 100644
--- a/wp-admin/includes/media.php
+++ b/wp-admin/includes/media.php
@@ -2295,7 +2295,7 @@ if ( empty($_GET['post_mime_type']) || $_GET['post_mime_type'] == 'all' )
 	$class = ' class="current"';
 else
 	$class = '';
-$type_links[] = "<li><a href='" . esc_url(add_query_arg(array('post_mime_type'=>'all', 'paged'=>false, 'm'=>false))) . "'$class>".__('All Types')."</a>";
+$type_links[] = '<li><a href="' . esc_url(add_query_arg(array('post_mime_type'=>'all', 'paged'=>false, 'm'=>false))) . '"' . $class . '>' . __('All Types') . '</a>';
 foreach ( $post_mime_types as $mime_type => $label ) {
 	$class = '';
 
@@ -2305,7 +2305,7 @@ foreach ( $post_mime_types as $mime_type => $label ) {
 	if ( isset($_GET['post_mime_type']) && wp_match_mime_types($mime_type, $_GET['post_mime_type']) )
 		$class = ' class="current"';
 
-	$type_links[] = "<li><a href='" . esc_url(add_query_arg(array('post_mime_type'=>$mime_type, 'paged'=>false))) . "'$class>" . sprintf( translate_nooped_plural( $label[2], $num_posts[$mime_type] ), "<span id='$mime_type-counter'>" . number_format_i18n( $num_posts[$mime_type] ) . '</span>') . '</a>';
+	$type_links[] = '<li><a href="' . esc_url(add_query_arg(array('post_mime_type'=>$mime_type, 'paged'=>false))) . '"' . $class . '>' . sprintf( translate_nooped_plural( $label[2], $num_posts[$mime_type] ), '<span id="' . $mime_type . '-counter">' . number_format_i18n( $num_posts[$mime_type] ) . '</span>') . '</a>';
 }
 /**
  * Filter the media upload mime type list items.
diff --git a/wp-admin/includes/post.php b/wp-admin/includes/post.php
index 4df22ccd03..bda4652390 100644
--- a/wp-admin/includes/post.php
+++ b/wp-admin/includes/post.php
@@ -1468,7 +1468,7 @@ function _admin_notice_post_locked() {
 		<div class="post-taken-over">
 			<div class="post-locked-avatar"></div>
 			<p class="wp-tab-first" tabindex="0">
-			<span class="currently-editing"></span><br>
+			<span class="currently-editing"></span><br />
 			<span class="locked-saving hidden"><img src="images/wpspin_light-2x.gif" width="16" height="16" /> <?php _e('Saving revision...'); ?></span>
 			<span class="locked-saved hidden"><?php _e('Your latest changes were saved as a revision.'); ?></span>
 			</p>
diff --git a/wp-admin/media.php b/wp-admin/media.php
index 7920bef917..a851564919 100644
--- a/wp-admin/media.php
+++ b/wp-admin/media.php
@@ -117,7 +117,7 @@ if ( current_user_can( 'upload_files' ) ) { ?>
 </p>
 
 <div class="media-single">
-<div id='media-item-<?php echo $att_id; ?>' class='media-item'>
+<div id="media-item-<?php echo $att_id; ?>" class="media-item">
 <?php echo get_media_item( $att_id, array( 'toggle' => false, 'send' => false, 'delete' => false, 'show_title' => false, 'errors' => !empty($errors[$att_id]) ? $errors[$att_id] : null ) ); ?>
 </div>
 </div>
diff --git a/wp-admin/network.php b/wp-admin/network.php
index 866283f0e6..27acf98fe5 100644
--- a/wp-admin/network.php
+++ b/wp-admin/network.php
@@ -219,11 +219,11 @@ function network_step1( $errors = false ) {
 		<?php // @todo: Link to an MS readme? ?>
 		<table class="form-table">
 			<tr>
-				<th><label><input type='radio' name='subdomain_install' value='1'<?php checked( $subdomain_install ); ?> /> <?php _e( 'Sub-domains' ); ?></label></th>
+				<th><label><input type="radio" name="subdomain_install" value="1"<?php checked( $subdomain_install ); ?> /> <?php _e( 'Sub-domains' ); ?></label></th>
 				<td><?php printf( _x( 'like <code>site1.%1$s</code> and <code>site2.%1$s</code>', 'subdomain examples' ), $hostname ); ?></td>
 			</tr>
 			<tr>
-				<th><label><input type='radio' name='subdomain_install' value='0'<?php checked( ! $subdomain_install ); ?> /> <?php _e( 'Sub-directories' ); ?></label></th>
+				<th><label><input type="radio" name="subdomain_install" value="0"<?php checked( ! $subdomain_install ); ?> /> <?php _e( 'Sub-directories' ); ?></label></th>
 				<td><?php printf( _x( 'like <code>%1$s/site1</code> and <code>%1$s/site2</code>', 'subdirectory examples' ), $hostname ); ?></td>
 			</tr>
 		</table>
diff --git a/wp-admin/network/site-info.php b/wp-admin/network/site-info.php
index 1034af1478..92dddc661a 100644
--- a/wp-admin/network/site-info.php
+++ b/wp-admin/network/site-info.php
@@ -138,7 +138,7 @@ if ( ! empty( $messages ) ) {
 			} else {
 				switch_to_blog( $id );
 			?>
-			<td><input name="blog[path]" type="text" id="path" value="<?php echo esc_attr( $details->path ) ?>" size="40" style='margin-bottom:5px;' />
+			<td><input name="blog[path]" type="text" id="path" value="<?php echo esc_attr( $details->path ) ?>" size="40" style="margin-bottom:5px;" />
 			<br /><input type="checkbox" style="width:20px;" name="update_home_url" value="update" <?php if ( get_option( 'siteurl' ) == untrailingslashit( get_blogaddress_by_id ($id ) ) || get_option( 'home' ) == untrailingslashit( get_blogaddress_by_id( $id ) ) ) echo 'checked="checked"'; ?> /> <?php _e( 'Update <code>siteurl</code> and <code>home</code> as well.' ); ?></td>
 			<?php
 				restore_current_blog();
diff --git a/wp-admin/network/site-users.php b/wp-admin/network/site-users.php
index 4e2c6c9d92..a037c8b871 100644
--- a/wp-admin/network/site-users.php
+++ b/wp-admin/network/site-users.php
@@ -176,7 +176,7 @@ if ( ! wp_is_large_network( 'users' ) && apply_filters( 'show_network_site_users
 
 require( ABSPATH . 'wp-admin/admin-header.php' ); ?>
 
-<script type='text/javascript'>
+<script type="text/javascript">
 /* <![CDATA[ */
 var current_site_id = <?php echo $id; ?>;
 /* ]]> */
diff --git a/wp-admin/network/users.php b/wp-admin/network/users.php
index eb6b7380e4..4efd87f5f8 100644
--- a/wp-admin/network/users.php
+++ b/wp-admin/network/users.php
@@ -28,7 +28,7 @@ function confirm_delete_users( $users ) {
 	<?php
 	wp_nonce_field( 'ms-users-delete' );
 	$site_admins = get_super_admins();
-	$admin_out = "<option value='$current_user->ID'>$current_user->user_login</option>";
+	$admin_out = '<option value="' . $current_user->ID . '">' . $current_user->user_login . '</option>';
 
 	foreach ( ( $allusers = (array) $_POST['allusers'] ) as $key => $val ) {
 		if ( $val != '' && $val != '0' ) {