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<!DOCTYPE html>
<title>Tests the CSSOM interfaces of @position-try rules</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#interfaces">
<link rel="author" href="mailto:xiaochengh@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="anchor"></div>
<div id="other-anchor"></div>
<div id="target"></div>
<script>
function createStyle(t, text) {
const style = document.createElement('style');
style.textContent = text;
t.add_cleanup(() => style.remove());
document.head.appendChild(style);
return style;
}
test(t => {
const style = createStyle(
t, '@position-try --pf { left: anchor(right); }');
const positionTryRule = style.sheet.cssRules[0];
assert_true(positionTryRule instanceof CSSPositionTryRule);
assert_equals(positionTryRule.name, '--pf');
assert_true(positionTryRule.style instanceof CSSStyleDeclaration);
assert_equals(positionTryRule.style.length, 1);
assert_equals(positionTryRule.style.left, 'anchor(right)');
}, 'CSSPositionTryRule attribute values');
test(t => {
const style = createStyle(t, `
@position-try --pf { top: anchor(top); left: 0; }
#anchor, #other-anchor, #target {
position: absolute; width: 100px; height: 100px;
}
#anchor { top: 100px; left: 0; anchor-name: --a; }
#other-anchor { top: 200px; left: 0; anchor-name: --b; }
#target { position-try-options: --pf; position-anchor: --a; left: 999999px; }
`);
const positionTryRule = style.sheet.cssRules[0];
// Check the initial position fallback result
assert_equals(target.getBoundingClientRect().left, 0);
assert_equals(target.getBoundingClientRect().top, 100);
// `left` is an allowed property in `@position-try` and should affect position fallback.
positionTryRule.style.setProperty('left', 'anchor(right)');
assert_equals(target.getBoundingClientRect().left, 100);
assert_equals(target.getBoundingClientRect().top, 100);
// This property are disallowed in `@position-try` rule, and hence should not affect
// position fallback.
positionTryRule.style.setProperty('position', 'static');
assert_equals(target.getBoundingClientRect().left, 100);
assert_equals(target.getBoundingClientRect().top, 100);
// `position-anchor` is an allowed property in `@position-try` and should affect position fallback.
positionTryRule.style.setProperty('position-anchor', '--b');
assert_equals(target.getBoundingClientRect().left, 100);
assert_equals(target.getBoundingClientRect().top, 200);
}, 'CSSPositionTryRule.style.setProperty setting allowed and disallowed properties');
</script>
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