at-position-try-allowed-declarations.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-anchor-position/at-position-try-allowed-declarations.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Tests which properties are allowed in @position-try</title>

<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#fallback-rule">

<link rel="author" href="mailto:xiaochengh@chromium.org">

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

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

<style id="style"></style>

<script>

function cleanup() {

  while (style.sheet.cssRules.length)

    style.sheet.deleteRule(0);

function test_allowed_declaration(property, value = '1px') {

  test(t => {

    t.add_cleanup(cleanup);

    const serialization = `${property}: ${value}`;

    const rule = `@position-try --foo  { ${property}: ${value}; }`;

    const index = style.sheet.insertRule(rule);

    const parsed = style.sheet.cssRules[index];

    assert_equals(parsed.cssText, `@position-try --foo { ${serialization}; }`);

  }, `${property}: ${value} is allowed in @position-try`);

function test_disallowed_declaration(property, value = '1px') {

  test(t => {

    t.add_cleanup(cleanup);

    const rule = `@position-try --foo { ${property}: ${value}; }`;

    const index = style.sheet.insertRule(rule);

    const parsed = style.sheet.cssRules[index];

    assert_equals(parsed.cssText, `@position-try --foo { }`);

  }, `${property}: ${value} is disallowed in @position-try`);

// Inset properties are allowed

test_allowed_declaration('top');

test_allowed_declaration('bottom');

test_allowed_declaration('left');

test_allowed_declaration('right');

test_allowed_declaration('inset-block-start');

test_allowed_declaration('inset-block-end');

test_allowed_declaration('inset-inline-start');

test_allowed_declaration('inset-inline-end');

test_allowed_declaration('inset-block');

test_allowed_declaration('inset-inline');

test_allowed_declaration('inset');

test_allowed_declaration('position-area', 'span-all');

// Margin properties are allowed

test_allowed_declaration('margin-top');

test_allowed_declaration('margin-bottom');

test_allowed_declaration('margin-left');

test_allowed_declaration('margin-right');

test_allowed_declaration('margin-block-start');

test_allowed_declaration('margin-block-end');

test_allowed_declaration('margin-inline-start');

test_allowed_declaration('margin-inline-end');

test_allowed_declaration('margin-block');

test_allowed_declaration('margin-inline');

test_allowed_declaration('margin');

// Sizing properties are allowed

test_allowed_declaration('width');

test_allowed_declaration('height');

test_allowed_declaration('block-size');

test_allowed_declaration('inline-size');

test_allowed_declaration('min-width');

test_allowed_declaration('min-height');

test_allowed_declaration('min-block-size');

test_allowed_declaration('min-inline-size');

test_allowed_declaration('max-width');

test_allowed_declaration('max-height');

test_allowed_declaration('max-block-size');

test_allowed_declaration('max-inline-size');

// Box alignment properties are allowed

test_allowed_declaration('justify-self', 'normal');

test_allowed_declaration('align-self', 'normal');

test_allowed_declaration('place-self', 'normal');

// The 'position-anchor' property is allowed

test_allowed_declaration('position-anchor', '--anchor');

// Custom properties are disallowed

test_disallowed_declaration('--custom');

// Test some other disallowed properties

test_disallowed_declaration('font-size');

test_disallowed_declaration('border-width');

test_disallowed_declaration('padding');

test_disallowed_declaration('display');

test_disallowed_declaration('position');

test_disallowed_declaration('float');

test_disallowed_declaration('justify-content', 'normal');

test_disallowed_declaration('align-content', 'normal');

test_disallowed_declaration('justify-items', 'normal');

test_disallowed_declaration('align-items', 'normal');

// 'revert' and 'revert-layer' are allowed

test_allowed_declaration('top', 'revert');

test_allowed_declaration('top', 'revert-layer');

test_allowed_declaration('inset', 'revert');

test_allowed_declaration('inset', 'revert-layer');

// !important is disallowed

test_disallowed_declaration('top', '1px !important');

test_disallowed_declaration('inset', '1px !important');

</script>