File: fullscreen-crash.html

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thunderbird 1%3A140.3.1esr-1
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<!DOCTYPE html>
<html class="test-wait">
<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring/">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=823150">

<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>

<style>

#a { height: 700px; }
#b { border: 4px solid #ccc; }

</style>
<div id="a"><div id="b"></div></div>
<script>

onload = () => {
  test_driver.bless("requestFullscreen", step2);
};
step2 = () => {
  b.requestFullscreen();
  b.addEventListener('fullscreenchange', step3);
};
step3 = () => {
  document.designMode = "on";
  document.execCommand("selectAll");
  document.execCommand("formatBlock", false, "p");
  document.documentElement.classList.remove('test-wait');
};

</script>
</html>