at-property-typedom.html | Explore in Territory

<!DOCTYPE html>
<link rel="help" href="https://drafts.css-houdini.org/css-properties-values-api-1/#css-style-value-reification">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="./resources/utils.js"></script>
<div id=div></div>
<script>

test(() => {
  let name = generate_name();
  with_style_node(`div { ${name}: 100px; }`, () => {
    // Before registering the property, ${name} should reify as a
    // a token sequence.
    assert_equals(div.computedStyleMap().get(name).constructor.name, 'CSSUnparsedValue');
    assert_equals(div.computedStyleMap().get(name).toString(), '100px');

    with_at_property({
      name: name,
      syntax: '"<length>"',
      inherits: false,
      initialValue: '0px'
    }, () => {
      // After registering, it should reify as a <length>.
      assert_equals(div.computedStyleMap().get(name).constructor.name, 'CSSUnitValue');
      assert_equals(div.computedStyleMap().get(name).value, 100);
      assert_equals(div.computedStyleMap().get(name).unit, 'px');
    });

    // After @property is removed, the computed value is once again a token
    // sequence.
    assert_equals(div.computedStyleMap().get(name).constructor.name, 'CSSUnparsedValue');
    assert_equals(div.computedStyleMap().get(name).toString(), '100px');
  });
}, 'Properties declared with @property reify correctly');

test(() => {
  let name = generate_name();
  // 0 is valid as a both <length> and <integer>, which reify differently.
  with_style_node(`div { ${name}: 0; }`, () => {
    with_at_property({
      name: name,
      syntax: '"<length>"',
      inherits: false,
      initialValue: '1000px'
    }, () => {
      assert_equals(div.computedStyleMap().get(name).constructor.name, 'CSSUnitValue');
      assert_equals(div.computedStyleMap().get(name).value, 0);
      assert_equals(div.computedStyleMap().get(name).unit, 'px');

      with_at_property({
        name: name,
        syntax: '"<integer>"',
        inherits: false,
        initialValue: '1000'
      }, () => {
        assert_equals(div.computedStyleMap().get(name).constructor.name, 'CSSUnitValue');
        assert_equals(div.computedStyleMap().get(name).value, 0);
        assert_equals(div.computedStyleMap().get(name).unit, 'number');
      });
    });
  });
}, 'Re-declaring a property with a different type affects reification');

</script>
chromium/third_party/blink/web_tests/external/wpt/css/css-properties-values-api/at-property-typedom.html
