File: serialize-escape-identifiers.html

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<!DOCTYPE html>
<html>
  <head>
    <title>Properly escape CSS identifiers</title>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <link rel="help" href="https://crbug.com/343000522">
    <style id="sheet">
      @import 'abc' layer(\{\});
      @counter-style abc\{\}oops {}
      @font-feature-values abc\{\}oops {}
      @font-palette-values --abc\{\}oops {}
      @keyframes abc\{\}oops {}
      @layer abc\;oops\!;
    </style>
  </head>
  <body>
  <script>
    test(()=>{
      const rules = Array.from(document.styleSheets[0].cssRules);
      const text = rules.map(r => r.cssText).join('\n');
      sheet.innerText = text;

      const new_rules = Array.from(document.styleSheets[0].cssRules);
      const new_text = new_rules.map(r => r.cssText).join('\n');
      assert_equals(new_text, text);
    }, 'Rules must be the same after serialization round-trip, even with escaped characters');
  </script>