Cherry-pick 4f8eae6. rdar://problem/107442491

Cherry-pick 260286.12@webkit-2023.2-embargoed (042db6f). rdar://104813991 Add test for display contents on focus change https://bugs.webkit.org/show_bug.cgi?id=251380 Reviewed by Antti Koivisto. Already fixed by #248776, but add this test for completeness. * LayoutTests/fast/css/content/display-contents-on-focus-crash-expected.txt: Added. * LayoutTests/fast/css/content/display-contents-on-focus-crash.html: Added. Canonical link: https://commits.webkit.org/260286.12@webkit-2023.2-embargoed Canonical link: https://commits.webkit.org/259548.438@safari-7615-branch Identifier: 245886.871@safari-7613.4.1.0-branch
WebKit · Apr 19, 2023 · bfa4aa7 · bfa4aa7
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diff --git a/LayoutTests/fast/css/content/display-contents-on-focus-crash-expected.txt b/LayoutTests/fast/css/content/display-contents-on-focus-crash-expected.txt
@@ -0,0 +1,2 @@
+
+This test passes if it doesn't crash.
diff --git a/LayoutTests/fast/css/content/display-contents-on-focus-crash.html b/LayoutTests/fast/css/content/display-contents-on-focus-crash.html
@@ -0,0 +1,24 @@
+<style>
+dfn:focus-within { display: contents }
+html { mask-image: url(about:)}
+</style>
+
+<script>
+if (window.testRunner)
+  testRunner.dumpAsText();
+
+function main() {
+  input.setCustomValidity("foo");
+  input.reportValidity();
+}
+</script>
+
+</style>
+<body onload="main()">
+  <dfn>
+    <textarea autofocus>
+    </textarea>
+  </dfn>
+  <input id="input">
+  <p>This test passes if it doesn't crash.</p>
+</body>