KSES: Add selected ARIA attributes support.

Allow low-privileged users to use the ARIA attributes `aria-describedby`, `aria-details`, `aria-label`, `aria-labelledby` and `aria-hidden`.

Props mattheu, swissspidy, rianrietveld, afercia, GaryJ.
See #30421.

Built from https://develop.svn.wordpress.org/branches/5.0@43731


git-svn-id: http://core.svn.wordpress.org/branches/5.0@43560 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/kses.php

@@ -1836,6 +1836,11 @@ function safecss_filter_attr( $css, $deprecated = '' ) {
  */
 function _wp_add_global_attributes( $value ) {
 	$global_attributes = array(
+		'aria-describedby' => true,
+		'aria-details' => true,
+		'aria-label' => true,
+		'aria-labelledby' => true,
+		'aria-hidden' => true,
 		'class' => true,
 		'id' => true,
 		'style' => true,

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-43730';
+$wp_version = '5.0-alpha-43731';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.