SVGLength-viewport.html

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This WPT test may be referenced by the following Test IDs:
- /svg/types/scripted/SVGLength-viewport.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<title>SVGLength with 'viewport' units</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="ref"></div>

<svg>

  <rect id="rect"/>

</svg>

<script>

  const units = ['vw', 'vh', 'vmin', 'vmax'];

  for (const unit of units) {

    const ref = document.getElementById("ref");

    ref.style.width=`10${unit}`;

    const rect = document.getElementById("rect");

    rect.setAttribute("x", `10${unit}`);

    const ref_width = ref.offsetWidth;

    let length = rect.x.baseVal;

    test(() => {

      assert_equals(length.unitType, SVGLength.SVG_LENGTHTYPE_UNKNOWN);

      assert_approx_equals(length.value, ref_width, 0.5);

    }, `${unit} unit in SVGLength`);

    test(() => {

      const old_value = length.value

      length.value = ref_width * 2;

      assert_approx_equals(length.valueInSpecifiedUnits, 20, 0.2);

      length.value = old_value;

    }, `Convert back to ${unit} from new user unit value`);

</script>