mask-shorthand-subproperties-reset.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-masking/mask-shorthand-subproperties-reset.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>Resetting mask shorthand subproperties</title>

<link rel="author" title="Tim Nguyen" href="https://github.com/nt1m">

<link rel="help" href="https://drafts.fxtf.org/css-masking/#the-mask">

<meta name="assert" content="All subproperties of the masking property are first reset to their initial values.">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

</head>

<body>

<div id="test"></div>

<script>

function set_subproperty(property, value) {

  const element = document.getElementById('test')

  element.style = ''

  element.style[property] = value

function test_shorthand_resetting_subproperty(property, newValue) {

  if (!CSS.supports(property, newValue))

    return

  test(() => {

    let testElem = document.getElementById('test');

    let computed = window.getComputedStyle(testElem);

    let initialValue = computed[property];

    set_subproperty(property, newValue);

    document.getElementById('test').style.mask = 'url("#mask")';

    assert_equals(computed[property], initialValue);

    assert_not_equals(computed.mask, "");

  }, 'Property ' + property + ' should be reset to its initial value.')

test_shorthand_resetting_subproperty('mask-border-mode', 'luminance');

test_shorthand_resetting_subproperty('mask-border-outset', '10px 20px 30px 40px');

test_shorthand_resetting_subproperty('mask-border-repeat', 'round space');

test_shorthand_resetting_subproperty('mask-border-slice', '1 2 3 4 fill');

test_shorthand_resetting_subproperty('mask-border-source', 'url("#mask-border")');

test_shorthand_resetting_subproperty('mask-border-width', '10px 20px 30px 40px');

test_shorthand_resetting_subproperty('mask-clip', 'no-clip')

test_shorthand_resetting_subproperty('mask-composite', 'subtract')

test_shorthand_resetting_subproperty('mask-image', 'url("#mask-image")')

test_shorthand_resetting_subproperty('mask-mode', 'luminance')

test_shorthand_resetting_subproperty('mask-origin', 'content-box')

test_shorthand_resetting_subproperty('mask-position', '10px 10px')

test_shorthand_resetting_subproperty('mask-repeat', 'no-repeat')

test_shorthand_resetting_subproperty('mask-size', '10px')

</script>

</body>

</html>