<!DOCTYPE html>
<title>Tests parsing of the anchor() function</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#anchor-pos">
<link rel="author" href="mailto:[email protected]">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
<script>
const anchorNames = [
'',
'--foo',
];
const insetProperties = [
'left',
'right',
'top',
'bottom',
'inset-block-start',
'inset-block-end',
'inset-inline-start',
'inset-inline-end',
];
const anchorSides = [
'inside',
'outside',
'left',
'right',
'top',
'bottom',
'start',
'end',
'self-start',
'self-end',
'center',
'50%',
];
const fallbacks = [
null,
'1px',
'50%',
'calc(50% + 1px)',
'anchor(left)',
'anchor(--bar left)',
'anchor(--bar left, anchor(--baz right))',
];
// Tests basic combinations
for (let property of insetProperties) {
// Using a wrong anchor-side (e.g., `top: anchor(--foo left)`) doesn't cause a
// parse error, but triggers the fallback when resolved.
for (let name of anchorNames) {
for (let side of anchorSides) {
for (let fallback of fallbacks) {
let value = `anchor(${name ? name + ' ' : ''}${side}${fallback ? ', ' + fallback : ''})`;
test_valid_value(property, value);
if (name) {
// The <anchor-element> is allowed to appear after the <anchor-side>
let value_flip_order = `anchor(${side} ${name}${fallback ? ', ' + fallback : ''})`;
test_valid_value(property, value_flip_order, value);
}
}
}
}
}
// Tests that anchor() can be used in a calc tree
test_valid_value('top', 'calc((anchor(--foo top) + anchor(--bar bottom)) / 2)');
test_valid_value('top', 'anchor(--foo top, calc(anchor(--bar bottom) * 0.5))');
test_valid_value('top', 'min(100px, 10%, anchor(--foo top), anchor(--bar bottom))');
</script>
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