1 files changed, 30 insertions, 0 deletions
diff --git a/layout/mathml/crashtests/400157.xhtml b/layout/mathml/crashtests/400157.xhtml
new file mode 100644
index 0000000000..c20306ef66
--- /dev/null
+++ b/layout/mathml/crashtests/400157.xhtml
@@ -0,0 +1,30 @@
+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:mathml="http://www.w3.org/1998/Math/MathML" class="reftest-wait">
+<mathml:mfenced/>
+
+
+<script><![CDATA[
+var docviewer;
+function do_onload() {
+  setTimeout(function() {
+    clearTimeout(timer);
+    SpecialPowers.setTextZoom(parent, 1);
+    document.documentElement.removeAttribute("class");
+  }, 500);
+  setTimeout(doe,50, 0.2);
+}
+do_onload();
+
+var timer;
+function doe(i) {
+  SpecialPowers.setTextZoom(parent, SpecialPowers.getTextZoom(parent) + i);
+
+  if (SpecialPowers.getTextZoom(parent) >= 4)
+    i = -0.2;
+
+  if (SpecialPowers.getTextZoom(parent) <= 0)
+    i = 0.2;
+  window.status = SpecialPowers.getTextZoom(parent);
+  timer = setTimeout(doe, 50, i);
+}
+]]></script>
+</html>