Merge pull request #18591 from craftcms/bugfix/18577-namespacing-and-aria-attributes

namespace additional aria attributes

Author: brandonkelly

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Unreleased
 
 - Fixed a bug where GraphQL results were getting cached even if they contained transform generation URLs. ([#18581](https://github.com/craftcms/cms/issues/18581))
+- Fixed a bug where `aria-activedescendant`, `aria-flowto`, and `aria-owns` attributes weren’t getting namespaced by `{% namespace %}` tags. ([#18577](https://github.com/craftcms/cms/issues/18577))
 
 ## 4.17.11 - 2026-03-17
 

src/helpers/Html.php

@@ -817,7 +817,7 @@ private static function _namespaceAttributes(string &$html, string $namespace, b
 
         // normal HTML attributes
         $html = preg_replace_callback(
-            "/(?<=\\s)((for|list|xlink:href|href|aria\\-labelledby|aria\\-describedby|aria\\-controls|data\\-target|data\\-reverse\\-target|data\\-target\\-prefix)=('|\"))([^'\"]+)\\3/i",
+            "/(?<=\\s)((for|list|xlink:href|href|aria\\-labelledby|aria\\-describedby|aria\\-controls|aria\\-activedescendant|aria\\-flowto|aria\\-owns|data\\-target|data\\-reverse\\-target|data\\-target\\-prefix)=('|\"))([^'\"]+)\\3/i",
             function(array $match) use ($namespace, $ids): string {
                 $matchIds = preg_split('/([,\s+]+)/', $match[4], flags: PREG_SPLIT_DELIM_CAPTURE);
                 $namespacedIds = '';