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chromium/third_party/blink/web_tests/external/wpt/svg/types/scripted/SVGLength-cap.html 

<!DOCTYPE HTML>
<title>SVGLength with 'cap' unit</title>
<link rel="help" href="https://www.w3.org/TR/SVG/types.html#InterfaceSVGLength">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="cap_ref" style="font-family:initial; font-size:20px; width:10cap"></div>
<svg>
  <text id="cap_test" x="10cap" style="font-family:initial; font-size:20px"></text>
</svg>
<script>
  let ref_width = cap_ref.getBoundingClientRect().width;
  let cap_length = cap_test.x.baseVal[0];

  test(() => {
    assert_equals(cap_length.unitType, SVGLength.SVG_LENGTHTYPE_UNKNOWN);
    assert_approx_equals(cap_length.value, ref_width, 0.1);
  }, "cap unit in SVGLength");

  test(() => {
    cap_length.value = ref_width * 2;
    assert_approx_equals(cap_length.valueInSpecifiedUnits, 20, 0.1);
  }, "Convert back to cap from new user unit value");
</script>