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chromium/third_party/blink/web_tests/fast/block/line-layout/selection-highlight-crash.html 

<!DOCTYPE html>
<html>
<body contenteditable="true">
Test passes if it does not crash.<br/>
a<ruby>b<rt>c</rt></ruby>d
<script>
if (window.testRunner)
    testRunner.dumpAsText();

document.execCommand("SelectAll");
</script>
</body>
</html>