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chromium/third_party/blink/web_tests/external/wpt/css/css-fonts/parsing/font-face-size-adjust.html 

<!DOCTYPE html>
<title>CSS Fonts 5 test: parsing the size-adjust descriptor</title>
<link rel="help" href="https://www.w3.org/TR/css-fonts-5/#size-adjust-desc">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style id="testStyle">
</style>
<script>
  const sheet = testStyle.sheet;
  // size-adjust grammar : <percentage [0,∞]>
  tests = [
    { sizeAdjust: '100%', valid: true },
    { sizeAdjust: '0%', valid: true },
    { sizeAdjust: '110%', valid: true },
    { sizeAdjust: '100000000000%', valid: true },
    { sizeAdjust: '-100%', valid: false },
    { sizeAdjust: '-1%', valid: false },
  ];

  for (let t of tests) {
    test(() => {
      assert_equals(sheet.cssRules.length, 0, "testSheet should initially be empty");
      sheet.insertRule("@font-face { size-adjust: " + t.sizeAdjust + "}");
      try {
        assert_equals(sheet.cssRules[0].style.getPropertyValue("size-adjust") != "", t.valid);
      } finally {
        sheet.deleteRule(0);
      }
    }, "Check that size-adjust: " + t.sizeAdjust + " is " + (t.valid ? "valid" : "invalid"));
  }
</script>