File: font_feature_values_map_iteration.html

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<!DOCTYPE html>
<html>
  <head>
    <title>CSSFontFeatureValuesMap Iteration and Modification</title>
    <link
      rel="help"
      href="https://drafts.csswg.org/css-fonts-4/#om-fontfeaturevalues"
    />
    <meta
      name="assert"
      content="Iteration while modifying CSSFontFeatureValuesMap does not crash."
    />
    <script type="text/javascript" src="/resources/testharness.js"></script>
    <script
      type="text/javascript"
      src="/resources/testharnessreport.js"
    ></script>
  </head>
  <body>
    <style>
      @font-feature-values TestFont {
        @styleset {
          a: 1;
          b: 2;
          c: 3;
        }
      }
    </style>
    <script>
      test(() => {
        const rule = document.styleSheets[0].cssRules[0];
        const map = rule.styleset;
        const iterator = map.entries();
        let count = 0;

        while (count < 10) {
          const { value: entry, done } = iterator.next();
          if (done) break;

          const [key, value] = entry;

          map.delete(key);
          for (let i = 0; i < 100; i++) {
            map.set(`newkey_${count}_${i}`, i);
          }

          count++;
        }
      }, "Iteration of the CSSFontFeatureValuesMap does not crash.");
    </script>
  </body>
</html>