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at-property.html
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<!DOCTYPE html>
<link rel="help" href="https://drafts.css-houdini.org/css-properties-values-api-1/#at-property-rule">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="./resources/utils.js"></script>
<div id="outer">
<div id="target"></div>
</div>
<script>
// Parsing:
let uppercase_first = (x) => x.charAt(0).toUpperCase() + x.slice(1);
let to_camel_case = (x) => x.split('-')[0] + x.split('-').slice(1).map(uppercase_first).join('');
function get_cssom_descriptor_value(rule, descriptor) {
switch (descriptor) {
case 'syntax':
return rule.syntax;
case 'inherits':
return rule.inherits;
case 'initial-value':
return rule.initialValue;
default:
assert_true(false, 'Should not reach here');
return null;
}
}
// Test that for the given descriptor (e.g. 'syntax'), the specified value
// will yield the expected_value when observed using CSSOM. If the expected_value
// is omitted, it is the same as the specified value.
function test_descriptor(descriptor, specified_value, expected_value) {
let camel = to_camel_case(descriptor);
if (typeof(expected_value) === 'undefined')
expected_value = specified_value;
test_with_at_property({ [camel]: specified_value }, (name, rule) => {
assert_equals(get_cssom_descriptor_value(rule, descriptor), expected_value);
}, `Attribute '${descriptor}' returns expected value for [${specified_value}]`);
}
// syntax
test_descriptor('syntax', '"<color>"', '<color>');
test_descriptor('syntax', '"<color> | none"', '<color> | none');
test_descriptor('syntax', '"<color># | <image> | none"', '<color># | <image> | none');
test_descriptor('syntax', '"foo | bar | baz"', 'foo | bar | baz');
test_descriptor('syntax', '"*"', '*');
test_descriptor('syntax', '"notasyntax"', 'notasyntax');
test_descriptor('syntax', 'red', '');
test_descriptor('syntax', 'rgb(255, 0, 0)', '');
test_descriptor('syntax', '<color>', '');
test_descriptor('syntax', 'foo | bar', '');
// initial-value
test_descriptor('initial-value', '10px');
test_descriptor('initial-value', 'rgb(1, 2, 3)');
test_descriptor('initial-value', 'red');
test_descriptor('initial-value', 'foo');
test_descriptor('initial-value', 'if(){}');
test_descriptor('initial-value', 'var(--x)');
// inherits
test_descriptor('inherits', 'true', true);
test_descriptor('inherits', 'false', false);
test_descriptor('inherits', 'none', false);
test_descriptor('inherits', '0', false);
test_descriptor('inherits', '1', false);
test_descriptor('inherits', '"true"', false);
test_descriptor('inherits', '"false"', false);
test_descriptor('inherits', 'calc(0)', false);
test_with_style_node('@property foo { }', (node) => {
assert_equals(node.sheet.rules.length, 0);
}, 'Invalid property name does not parse [foo]');
test_with_style_node('@property -foo { }', (node) => {
assert_equals(node.sheet.rules.length, 0);
}, 'Invalid property name does not parse [-foo]');
// Applying @property rules
function test_applied(syntax, initial, inherits, expected) {
test_with_at_property({
syntax: `"${syntax}"`,
initialValue: initial,
inherits: inherits
}, (name, rule) => {
let actual = getComputedStyle(target).getPropertyValue(name);
assert_equals(actual, expected);
}, `Rule applied [${syntax}, ${initial}, ${inherits}]`);
}
function test_not_applied(syntax, initial, inherits) {
test_with_at_property({
syntax: `"${syntax}"`,
initialValue: initial,
inherits: inherits
}, (name, rule) => {
let actual = getComputedStyle(target).getPropertyValue(name);
assert_equals(actual, '');
}, `Rule not applied [${syntax}, ${initial}, ${inherits}]`);
}
// syntax, initialValue, inherits, expected
test_applied('*', 'if(){}', false, 'if(){}');
test_applied('<angle>', '42deg', false, '42deg');
test_applied('<angle>', '1turn', false, '360deg');
test_applied('<color>', 'green', false, 'rgb(0, 128, 0)');
test_applied('<color>', 'rgb(1, 2, 3)', false, 'rgb(1, 2, 3)');
test_applied('<image>', 'url("http://a/")', false, 'url("http://a/")');
test_applied('<integer>', '5', false, '5');
test_applied('<length-percentage>', '10px', false, '10px');
test_applied('<length-percentage>', '10%', false, '10%');
test_applied('<length-percentage>', 'calc(10% + 10px)', false, 'calc(10% + 10px)');
test_applied('<length>', '10px', false, '10px');
test_applied('<number>', '2.5', false, '2.5');
test_applied('<percentage>', '10%', false, '10%');
test_applied('<resolution>', '50dppx', false, '50dppx');
test_applied('<resolution>', '96dpi', false, '1dppx');
test_applied('<time>', '10s', false, '10s');
test_applied('<time>', '1000ms', false, '1s');
test_applied('<transform-function>', 'rotateX(0deg)', false, 'rotateX(0deg)');
test_applied('<transform-list>', 'rotateX(0deg)', false, 'rotateX(0deg)');
test_applied('<transform-list>', 'rotateX(0deg) translateX(10px)', false, 'rotateX(0deg) translateX(10px)');
test_applied('<url>', 'url("http://a/")', false, 'url("http://a/")');
// inherits: true/false
test_applied('<color>', 'tomato', false, 'rgb(255, 99, 71)');
test_applied('<color>', 'tomato', true, 'rgb(255, 99, 71)');
test_with_at_property({ syntax: '"*"', inherits: true }, (name, rule) => {
try {
outer.style.setProperty(name, 'foo');
let actual = getComputedStyle(target).getPropertyValue(name);
assert_equals(actual, 'foo');
} finally {
outer.style = '';
}
}, 'Rule applied for "*", even with no initial value');
test_not_applied(undefined, 'green', false);
test_not_applied('<color>', undefined, false);
test_not_applied('<color>', 'green', undefined);
test_not_applied('<gandalf>', 'grey', false);
test_not_applied('gandalf', 'grey', false);
test_not_applied('<color>', 'notacolor', false);
test_not_applied('<length>', '10em', false);
// Inheritance
test_with_at_property({
syntax: '"<length>"',
inherits: false,
initialValue: '0px'
}, (name, rule) => {
try {
outer.style = `${name}: 40px`;
assert_equals(getComputedStyle(outer).getPropertyValue(name), '40px');
assert_equals(getComputedStyle(target).getPropertyValue(name), '0px');
} finally {
outer.style = '';
}
}, 'Non-inherited properties do not inherit');
test_with_at_property({
syntax: '"<length>"',
inherits: true,
initialValue: '0px'
}, (name, rule) => {
try {
outer.style = `${name}: 40px`;
assert_equals(getComputedStyle(outer).getPropertyValue(name), '40px');
assert_equals(getComputedStyle(target).getPropertyValue(name), '40px');
} finally {
outer.style = '';
}
}, 'Inherited properties inherit');
// Initial values
test_with_at_property({
syntax: '"<color>"',
inherits: true,
initialValue: 'green'
}, (name, rule) => {
try {
target.style = `--x:var(${name})`;
assert_equals(getComputedStyle(target).getPropertyValue(name), 'rgb(0, 128, 0)');
} finally {
target.style = '';
}
}, 'Initial values substituted as computed value');
test_with_at_property({
syntax: '"<length>"',
inherits: false,
initialValue: undefined
}, (name, rule) => {
try {
target.style = `${name}: calc(1px + 1px);`;
assert_equals(getComputedStyle(target).getPropertyValue(name), ' calc(1px + 1px)');
} finally {
target.style = '';
}
}, 'Non-universal registration are invalid without an initial value');
test_with_at_property({
syntax: '"*"',
inherits: false,
initialValue: undefined
}, (name, rule) => {
try {
// If the registration suceeded, ${name} does *not* inherit, and hence
// the computed value on 'target' should be empty.
outer.style = `${name}: calc(1px + 1px);`;
assert_equals(getComputedStyle(target).getPropertyValue(name), '');
} finally {
outer.style = '';
}
}, 'Initial value may be omitted for universal registration');
</script>