Merge branch 'master' into fix-dialog-with-include-fragment

Author: muan

index.js

@@ -213,7 +213,7 @@ class DetailsDialogElement extends HTMLElement {
 
     const summary = details.querySelector('summary')
     if (summary) {
-      summary.setAttribute('role', 'button')
+      if (!summary.hasAttribute('role')) summary.setAttribute('role', 'button')
       summary.addEventListener('click', onSummaryClick, {capture: true})
     }