Make sure not to lose the element's pseudo-style when reparenting for first-line.

emilio · foolip · commit b8861abfb2ff · 2025-08-13T23:18:47.000+07:00
Differential Revision: https://phabricator.services.mozilla.com/D258703 bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1979200 gecko-commit: a4948811d579443a7cfb16d24b3268aea58f2d89 gecko-reviewers: dshin
diff --git a/css/css-view-transitions/first-line-reparent-crash.html b/css/css-view-transitions/first-line-reparent-crash.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<html class="test-wait">
+<script>
+window.addEventListener("load", () => {
+  const a = document.createElement("style")
+  document.documentElement.appendChild(a)
+  a.textContent = ":first-line{}"
+  document.adoptNode(document.body)
+  document.startViewTransition().ready.then(() => {
+    document.documentElement.className = "";
+  });
+})
+</script>
