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chromium/third_party/blink/web_tests/external/wpt/css/css-anchor-position/chrome-40286059-crash.html 

<!DOCTYPE html>
<link rel="help" href="https://crbug.com/40286059">
<p>Pass if no crash</p>
<div id="pop" style="position-try-fallbacks: --foo" popover></div>
<script>
  getComputedStyle(pop).left;
</script>