Add attribute change steps hiding test (#41061)

josepharhar · web-flow · commit 8f3e51e7eaf3 · 2023-07-17T16:01:44.000-04:00
diff --git a/html/semantics/popovers/popover-undefined-remove-crash.html b/html/semantics/popovers/popover-undefined-remove-crash.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://github.com/whatwg/html/issues/9459#issuecomment-1630466911">
+
+<div id="po" popover>
+PO
+</div>
+
+<script>
+po.popover = undefined;
+po.remove();
+</script>
