Index: wp-admin/css/wp-admin.css
===================================================================
--- wp-admin/css/wp-admin.css	(revision 23447)
+++ wp-admin/css/wp-admin.css	(working copy)
@@ -540,6 +540,7 @@
 
 /* .widefat - main style for tables */
 .widefat {
+	border-collapse: separate;
 	border-spacing: 0;
 	width: 100%;
 	clear: both;
@@ -573,6 +574,7 @@
 
 .widefat td,
 .widefat th {
+	border-spacing: 0;
 	border-width: 0 0 1px 0;
 	border-style: solid;
 }
@@ -3236,6 +3238,7 @@
 }
 
 #post-status-info {
+	border-collapse: separate;
 	border-width: 0 1px 1px;
 	border-style: none solid solid;
 	width: 100%;
@@ -3246,6 +3249,7 @@
 }
 
 #post-status-info td {
+	border-spacing:0;
 	font-size: 12px;
 }
 
Index: wp-admin/edit-form-advanced.php
===================================================================
--- wp-admin/edit-form-advanced.php	(revision 23447)
+++ wp-admin/edit-form-advanced.php	(working copy)
@@ -362,7 +362,7 @@
 
 <?php wp_editor($post->post_content, 'content', array('dfw' => true, 'tabfocus_elements' => 'insert-media-button,save-post', 'editor_height' => 360) ); ?>
 
-<table id="post-status-info" cellspacing="0"><tbody><tr>
+<table id="post-status-info"><tbody><tr>
 	<td id="wp-word-count"><?php printf( __( 'Word count: %s' ), '<span class="word-count">0</span>' ); ?></td>
 	<td class="autosave-info">
 	<span class="autosave-message">&nbsp;</span>
Index: wp-admin/import.php
===================================================================
--- wp-admin/import.php	(revision 23447)
+++ wp-admin/import.php	(working copy)
@@ -77,7 +77,7 @@
 } else {
 	uasort($importers, create_function('$a, $b', 'return strnatcasecmp($a[0], $b[0]);'));
 ?>
-<table class="widefat importers" cellspacing="0">
+<table class="widefat importers">
 
 <?php
 	$alt = '';
Index: wp-admin/includes/ajax-actions.php
===================================================================
--- wp-admin/includes/ajax-actions.php	(revision 23447)
+++ wp-admin/includes/ajax-actions.php	(working copy)
@@ -1379,7 +1379,7 @@
 	global $wp_list_table;
 
 	check_ajax_referer( 'taxinlineeditnonce', '_inline_edit' );
-	
+
 	$post_data = wp_unslash( $_POST );
 
 	$taxonomy = sanitize_key( $post_data['taxonomy'] );
@@ -1445,7 +1445,7 @@
 	if ( ! $posts )
 		wp_die( __('No items found.') );
 
-	$html = '<table class="widefat" cellspacing="0"><thead><tr><th class="found-radio"><br /></th><th>'.__('Title').'</th><th class="no-break">'.__('Type').'</th><th class="no-break">'.__('Date').'</th><th class="no-break">'.__('Status').'</th></tr></thead><tbody>';
+	$html = '<table class="widefat"><thead><tr><th class="found-radio"><br /></th><th>'.__('Title').'</th><th class="no-break">'.__('Type').'</th><th class="no-break">'.__('Date').'</th><th class="no-break">'.__('Status').'</th></tr></thead><tbody>';
 	foreach ( $posts as $post ) {
 		$title = trim( $post->post_title ) ? $post->post_title : __( '(no title)' );
 
@@ -2086,7 +2086,7 @@
 		$screen_id = sanitize_key($_POST['screenid']);
 	else
 		$screen_id = 'site';
-	
+
 	if ( ! empty($_POST['data']) ) {
 		$data = wp_unslash( (array) $_POST['data'] );
 		// todo: how much to sanitize and preset and what to leave to be accessed from $data or $_POST..?
Index: wp-admin/includes/class-wp-comments-list-table.php
===================================================================
--- wp-admin/includes/class-wp-comments-list-table.php	(revision 23447)
+++ wp-admin/includes/class-wp-comments-list-table.php	(working copy)
@@ -278,7 +278,7 @@
 		$this->display_tablenav( 'top' );
 
 ?>
-<table class="<?php echo implode( ' ', $this->get_table_classes() ); ?>" cellspacing="0">
+<table class="<?php echo implode( ' ', $this->get_table_classes() ); ?>">
 	<thead>
 	<tr>
 		<?php $this->print_column_headers(); ?>
@@ -551,7 +551,7 @@
 
 		wp_nonce_field( "fetch-list-" . get_class( $this ), '_ajax_fetch_list_nonce' );
 ?>
-<table class="<?php echo implode( ' ', $this->get_table_classes() ); ?>" cellspacing="0" style="display:none;">
+<table class="<?php echo implode( ' ', $this->get_table_classes() ); ?>" style="display:none;">
 	<tbody id="the-comment-list"<?php if ( $singular ) echo " data-wp-lists='list:$singular'"; ?>>
 		<?php if ( ! $output_empty ) $this->display_rows_or_placeholder(); ?>
 	</tbody>
Index: wp-admin/includes/class-wp-list-table.php
===================================================================
--- wp-admin/includes/class-wp-list-table.php	(revision 23447)
+++ wp-admin/includes/class-wp-list-table.php	(working copy)
@@ -719,7 +719,7 @@
 		$this->display_tablenav( 'top' );
 
 ?>
-<table class="wp-list-table <?php echo implode( ' ', $this->get_table_classes() ); ?>" cellspacing="0">
+<table class="wp-list-table <?php echo implode( ' ', $this->get_table_classes() ); ?>">
 	<thead>
 	<tr>
 		<?php $this->print_column_headers(); ?>
Index: wp-admin/includes/media.php
===================================================================
--- wp-admin/includes/media.php	(revision 23447)
+++ wp-admin/includes/media.php	(working copy)
@@ -1822,7 +1822,7 @@
 <form enctype="multipart/form-data" method="post" action="<?php echo esc_attr($form_action_url); ?>" class="<?php echo $form_class; ?>" id="gallery-form">
 <?php wp_nonce_field('media-form'); ?>
 <?php //media_upload_form( $errors ); ?>
-<table class="widefat" cellspacing="0">
+<table class="widefat">
 <thead><tr>
 <th><?php _e('Media'); ?></th>
 <th class="order-head"><?php _e('Order'); ?></th>
Index: wp-admin/includes/meta-boxes.php
===================================================================
--- wp-admin/includes/meta-boxes.php	(revision 23447)
+++ wp-admin/includes/meta-boxes.php	(working copy)
@@ -823,7 +823,7 @@
  */
 function link_xfn_meta_box($link) {
 ?>
-<table class="links-table" cellspacing="0">
+<table class="links-table">
 	<tr>
 		<th scope="row"><label for="link_rel"><?php /* translators: xfn: http://gmpg.org/xfn/ */ _e('rel:') ?></label></th>
 		<td><input type="text" name="link_rel" id="link_rel" value="<?php echo ( isset( $link->link_rel ) ? esc_attr($link->link_rel) : ''); ?>" /></td>
Index: wp-admin/update-core.php
===================================================================
--- wp-admin/update-core.php	(revision 23447)
+++ wp-admin/update-core.php	(working copy)
@@ -191,7 +191,7 @@
 <form method="post" action="<?php echo $form_action; ?>" name="upgrade-plugins" class="upgrade">
 <?php wp_nonce_field('upgrade-core'); ?>
 <p><input id="upgrade-plugins" class="button" type="submit" value="<?php esc_attr_e('Update Plugins'); ?>" name="upgrade" /></p>
-<table class="widefat" cellspacing="0" id="update-plugins-table">
+<table class="widefat" id="update-plugins-table">
 	<thead>
 	<tr>
 		<th scope="col" class="manage-column check-column"><input type="checkbox" id="plugins-select-all" /></th>
@@ -269,7 +269,7 @@
 <form method="post" action="<?php echo $form_action; ?>" name="upgrade-themes" class="upgrade">
 <?php wp_nonce_field('upgrade-core'); ?>
 <p><input id="upgrade-themes" class="button" type="submit" value="<?php esc_attr_e('Update Themes'); ?>" name="upgrade" /></p>
-<table class="widefat" cellspacing="0" id="update-themes-table">
+<table class="widefat" id="update-themes-table">
 	<thead>
 	<tr>
 		<th scope="col" class="manage-column check-column"><input type="checkbox" id="themes-select-all" /></th>
Index: wp-includes/post-template.php
===================================================================
--- wp-includes/post-template.php	(revision 23447)
+++ wp-includes/post-template.php	(working copy)
@@ -1429,7 +1429,7 @@
 
 <br class="clear" />
 
-<table class="widefat post-revisions" cellspacing="0" id="post-revisions">
+<table class="widefat post-revisions" id="post-revisions">
 	<col />
 	<col />
 	<col style="width: 33%" />