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diff --git a/layout/base/tests/bug1258308-1-ref.html b/layout/base/tests/bug1258308-1-ref.html
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+<!DOCTYPE HTML>
+<html class="reftest-wait">
+<head>
+ <script src="/tests/SimpleTest/SimpleTest.js"></script>
+ <script src="/tests/SimpleTest/EventUtils.js"></script>
+ <meta charset="utf-8">
+ <title>Testcase #1 for bug 1258308</title>
+ <script>
+ function test1() {
+ synthesizeKey("KEY_ArrowDown");
+ synthesizeKey("KEY_ArrowDown");
+ // caret should now be at the start of the third line
+ document.body.offsetHeight;
+ requestAnimationFrame(() => requestAnimationFrame(() => {
+ document.documentElement.removeAttribute("class");
+ }));
+ }
+ function runTests() {
+ document.querySelector('textarea').focus();
+ document.body.offsetHeight;
+ }
+ </script>
+</head>
+<body>
+
+<textarea onfocus="test1()" spellcheck="false" style="-moz-appearance:none;scrollbar-width:none">abc
+def
+ghi</textarea>
+
+<script>
+SimpleTest.waitForFocus(runTests);
+</script>
+</body>
+</html>