LibWeb/HTML: Implement focus restoration in HTMLDialogElement

When a dialog is closed, restore focus to the previously focused element if focus is within the dialog or if the dialog was modal.
Author: https://github.com/F3n67u Commit: fd3c69227f Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/6164 Reviewed-by: https://github.com/gmta ✅
2025-10-19 06:29:43 +00:00 · 2025-09-11 11:17:37 -07:00 · 2025-09-11 11:17:37 -07:00 · fd3c69227f · 2025-10-03 06:56:57 +00:00
commit fd3c69227f
parent d082e7ec58
4 changed files with 117 additions and 7 deletions
--- a/Libraries/LibWeb/HTML/HTMLDialogElement.h
+++ b/Libraries/LibWeb/HTML/HTMLDialogElement.h
@ -72,6 +72,9 @@ private:

    // https://html.spec.whatwg.org/multipage/interactive-elements.html#dialog-toggle-task-tracker
    Optional<ToggleTaskTracker> m_dialog_toggle_task_tracker;
+
+    // https://html.spec.whatwg.org/multipage/interactive-elements.html#previously-focused-element
+    GC::Ptr<Node> m_previously_focused_element;
 };

 }