Blitz - WPT: computedStyle-zoom.html

wpt / css / css-viewport / computedStyle-zoom.html

Data from commit:
a50cb89 wpt: run reference-named files which are themselves tests (#836) (2026-09-03)

Subtest	Status	Message
getComputedStyle for elements with css zoom	PASS
getComputedStyle for elements with css zoom 1	PASS
getComputedStyle for elements with css zoom 2	FAIL	assert_equals: width expected "64px" but got "256px"
getComputedStyle for elements with css zoom 3	FAIL	assert_equals: width expected "64px" but got "128px"
getComputedStyle for elements with css zoom 4	FAIL	assert_equals: width expected "64px" but got "512px"
getComputedStyle for elements with css zoom 5	FAIL	assert_equals: width expected "1px" but got "2px"

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/css/css-viewport/computedStyle-zoom.html

<!DOCTYPE html>
<title>getComputedStyle for elements with css zoom</title>
<link rel="author" title="Yotam Hacohen" href="mailto:yotha@chromium.org">
<link rel="author" title="Google" href="http://www.google.com/">
<link rel="help" href="https://drafts.csswg.org/css-viewport/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  div {
    width: 64px;
    height: 64px;
    font-size: 64px;
    line-height: 64px;
    text-indent: 64px;
    background-color: blue
  }
  div.x4_zoom {
    zoom: 4.0;
    background-color: blueviolet;
  }
  div.x2_zoom {
    background-color: chartreuse;
    zoom: 2.0;
  }
</style>
</head>
<body>
  <div id="no_zoom"></div>
  <div class="x4_zoom" id="with_zoom"></div>
  <div class="x2_zoom" id="parent_div">
    <div class="x4_zoom" id="nested_zoom"></div>
  </div>
  <div class="x2_zoom" id="testing_set_style"></div>
  <script>
    const LENGTH_PROPS = [
      "width",
      "height",
      "line-height",
      "text-indent",
      "font-size",
    ];
    test(function() {
      assert_true(!!no_zoom, "no zoom target exists");
      assert_true(!!with_zoom, "zoom target exists");
      assert_true(!!nested_zoom, "zoom target exists");
      assert_true(!!parent_div, "parent div with zoom exists")
    });
    function assert_length_props(style, expected) {
      for (let prop of LENGTH_PROPS) {
        assert_equals(style.getPropertyValue(prop), expected, prop);
      }
    }
    test(function(){
      let noZoomStyle = getComputedStyle(no_zoom);
      assert_length_props(noZoomStyle, "64px");
      assert_equals(noZoomStyle.getPropertyValue("zoom"), "1");
    });
    test(function(){
      let withZoomStyle = getComputedStyle(with_zoom);
      assert_length_props(withZoomStyle, "64px");
      assert_equals(withZoomStyle.getPropertyValue("zoom"), "4");
    });
    test(function(){
      let parentWithZoomStyle = getComputedStyle(parent_div);
      assert_length_props(parentWithZoomStyle, "64px");
      assert_equals(parentWithZoomStyle.getPropertyValue("zoom"), "2");
    });
    test(function(){
      nestedZoomStyle = getComputedStyle(nested_zoom);
      assert_length_props(nestedZoomStyle, "64px");
      assert_equals(nestedZoomStyle.getPropertyValue("zoom"), "4");
    });
    test(function(){
      testDivStyle = getComputedStyle(testing_set_style);
      testing_set_style.setAttribute("style", LENGTH_PROPS.map(p => p + ": 1px").join(";"));
      assert_length_props(testDivStyle, "1px");
      assert_equals(testDivStyle.getPropertyValue("zoom"), "2");
      testing_set_style.setAttribute("style", LENGTH_PROPS.map(p => p + ": 64px").join(";"));
      assert_length_props(testDivStyle, "64px");
      assert_equals(testDivStyle.getPropertyValue("zoom"), "2");
    });
  </script>
</body>