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chromium/third_party/blink/web_tests/external/wpt/css/css-contain/content-visibility/hidden-execcommand-crash.html 

<!DOCTYPE html>
<link rel=author href="mailto:[email protected]">
<link rel=help href="https://bugs.chromium.org/p/chromium/issues/detail?id=1280134">

<html contenteditable=true>
  X<div style="content-visibility:hidden">Y</div>Z
<script>
document.execCommand("selectall");
document.execCommand("fontSize", false, 6);
</script>