In HTML5, the action attribute is no longer required. Remove this attribute when empty.

The admin HTML is served with the HTML5 doctype.

"The action and formaction content attributes, if specified, must have a value that is a valid non-empty URL potentially surrounded by spaces." 
http://www.w3.org/html/wg/drafts/html/master/forms.html#attr-fs-action

Props voldemortensen.
Fixes #30126.


git-svn-id: https://develop.svn.wordpress.org/trunk@31200 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/class-wp-posts-list-table.php

@@ -961,7 +961,7 @@ class WP_Posts_List_Table extends WP_List_Table {
 
 	?>
 
-	<form method="get" action=""><table style="display: none"><tbody id="inlineedit">
+	<form method="get"><table style="display: none"><tbody id="inlineedit">
 		<?php
 		$hclass = count( $hierarchical_taxonomies ) ? 'post' : 'page';
 		$bulk = 0;

src/wp-admin/includes/class-wp-terms-list-table.php

@@ -463,7 +463,7 @@ class WP_Terms_List_Table extends WP_List_Table {
 			return;
 ?>
 
-	<form method="get" action=""><table style="display: none"><tbody id="inlineedit">
+	<form method="get"><table style="display: none"><tbody id="inlineedit">
 		<tr id="inline-edit" class="inline-edit-row" style="display: none"><td colspan="<?php echo $this->get_column_count(); ?>" class="colspanchange">
 
 			<fieldset><div class="inline-edit-col">

src/wp-admin/includes/dashboard.php

@@ -155,7 +155,7 @@ function wp_add_dashboard_widget( $widget_id, $widget_name, $callback, $control_
 }
 
 function _wp_dashboard_control_callback( $dashboard, $meta_box ) {
-	echo '<form action="" method="post" class="dashboard-widget-control-form">';
+	echo '<form method="post" class="dashboard-widget-control-form">';
 	wp_dashboard_trigger_widget_control( $meta_box['id'] );
 	wp_nonce_field( 'edit-dashboard-widget_' . $meta_box['id'], 'dashboard-widget-nonce' );
 	echo '<input type="hidden" name="widget_id" value="' . esc_attr($meta_box['id']) . '" />';

src/wp-admin/includes/media.php

@@ -2293,7 +2293,7 @@ function media_upload_library_form($errors) {
 
 ?>
 
-<form id="filter" action="" method="get">
+<form id="filter" method="get">
 <input type="hidden" name="type" value="<?php echo esc_attr( $type ); ?>" />
 <input type="hidden" name="tab" value="<?php echo esc_attr( $tab ); ?>" />
 <input type="hidden" name="post_id" value="<?php echo (int) $post_id; ?>" />

src/wp-admin/includes/plugin-install.php

@@ -176,7 +176,7 @@ function install_search_form( $type_selector = true ) {
 		$input_attrs = 'class="wp-filter-search" placeholder="' . esc_attr__( 'Search Plugins' ) . '" ';
 	}
 
-	?><form class="search-form search-plugins" method="get" action="">
+	?><form class="search-form search-plugins" method="get">
 		<input type="hidden" name="tab" value="search" />
 		<?php if ( $type_selector ) : ?>
 		<select name="type" id="typeselector">
@@ -222,7 +222,7 @@ function install_plugins_favorites_form() {
 	$user = ! empty( $_GET['user'] ) ? wp_unslash( $_GET['user'] ) : get_user_option( 'wporg_favorites' );
 	?>
 	<p class="install-help"><?php _e( 'If you have marked plugins as favorites on WordPress.org, you can browse them here.' ); ?></p>
-	<form method="get" action="">
+	<form method="get">
 		<input type="hidden" name="tab" value="favorites" />
 		<p>
 			<label for="user"><?php _e( 'Your WordPress.org username:' ); ?></label>
@@ -253,7 +253,7 @@ function display_plugins_table() {
 	}
 
 	?>
-	<form id="plugin-filter" action="" method="post">
+	<form id="plugin-filter" method="post">
 		<?php $wp_list_table->display(); ?>
 	</form>
 	<?php

src/wp-admin/includes/screen.php

@@ -1026,7 +1026,7 @@ final class WP_Screen {
 
 		?>
 		<div id="screen-options-wrap" class="hidden" tabindex="-1" aria-label="<?php esc_attr_e('Screen Options Tab'); ?>">
-		<form id="adv-settings" action="" method="post">
+		<form id="adv-settings" method="post">
 		<?php if ( isset( $wp_meta_boxes[ $this->id ] ) || $this->get_option( 'per_page' ) || ( $columns && empty( $columns['_title'] ) ) ) : ?>
 			<h5><?php _e( 'Show on screen' ); ?></h5>
 		<?php

src/wp-admin/includes/template.php

@@ -444,7 +444,7 @@ function wp_comment_reply($position = '1', $checkbox = false, $mode = 'single',
 	}
 
 ?>
-<form method="get" action="">
+<form method="get">
 <?php if ( $table_row ) : ?>
 <table style="display:none;"><tbody id="com-reply"><tr id="replyrow" style="display:none;"><td colspan="<?php echo $wp_list_table->get_column_count(); ?>" class="colspanchange">
 <?php else : ?>

src/wp-admin/includes/theme-install.php

@@ -57,7 +57,7 @@ function install_theme_search_form( $type_selector = true ) {
 	if ( ! $type_selector )
 		echo '<p class="install-help">' . __( 'Search for themes by keyword.' ) . '</p>';
 	?>
-<form id="search-themes" method="get" action="">
+<form id="search-themes" method="get">
 	<input type="hidden" name="tab" value="search" />
 	<?php if ( $type_selector ) : ?>
 	<label class="screen-reader-text" for="typeselector"><?php _e('Type of search'); ?></label>
@@ -99,7 +99,7 @@ function install_themes_dashboard() {
 <h4><?php _e('Feature Filter') ?></h4>
 <p class="install-help"><?php _e( 'Find a theme based on specific features.' ); ?></p>
 
-<form method="get" action="">
+<form method="get">
 	<input type="hidden" name="tab" value="search" />
 	<?php
 	$feature_list = get_theme_feature_list();

src/wp-admin/includes/widgets.php

@@ -205,7 +205,7 @@ function wp_widget_control( $sidebar_args ) {
 	</div>
 
 	<div class="widget-inside">
-	<form action="" method="post">
+	<form method="post">
 	<div class="widget-content">
 <?php
 	if ( isset($control['callback']) )