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<!DOCTYPE html>
<html>
<body>
<style>
#container + * { clear: both; }
</style>
<p id="container"><textarea></textarea></p>
<script>
if (window.testRunner)
testRunner.dumpAsText();
var textarea = document.getElementsByTagName('textarea')[0];
textarea.focus();
textarea.innerHTML = 'a\n';
textarea.selectionStart = 1;
textarea.selectionEnd = 1;
document.execCommand('InsertLineBreak', false, null);
document.body.innerText = "This test verifies WebKit doesn't crash even if the DOM changes in shadow DOM caused the shadow host's style to change.\nPASS";
</script>
</body>
</html>
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