File: chrome-377324991-crash.html

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<!DOCTYPE html>
<html class="test-wait">
<title>CSS Anchor Positioning Test: crash for simultaneous @position-try and display:none change</title>
<link rel="help" href="https://crbug.com/377324991">
<style>
  @position-try --opt {
    position-area: right center;
  }
  #anchor {
    width: 100px;
    height: 100px;
    background-color: green;
    anchor-name: --a;
  }
  #anchored {
    position: absolute;
    width: 100px;
    height: 100px;
    background-color: lime;
    position-anchor: --a;
    position-area: left center;
    position-try-fallbacks: --opt;
  }
</style>
<div id="anchor"></div>
<div id="anchored"></div>
<script>
  requestAnimationFrame(() => {
    requestAnimationFrame(() => {
      anchored.style.display = 'none';
      document.styleSheets[0].insertRule("@position-try --opt {}");
      document.documentElement.classList.remove("test-wait");
    });
  });
</script>