<!DOCTYPE html>
<title>CSS Nesting: CSSNestedDeclarations matching</title>
<link rel="help" href="https://drafts.csswg.org/css-nesting-1/#nested-declarations-rule">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
.trailing {
--x: FAIL;
& { --x: FAIL; }
--x: PASS;
}
</style>
<div class=trailing></div>
<script>
test(() => {
let e = document.querySelector('.trailing');
assert_equals(getComputedStyle(e).getPropertyValue('--x'), 'PASS');
}, 'Trailing declarations apply after any preceding rules');
</script>
<style>
.trailing_no_leading {
& { --x: FAIL; }
--x: PASS;
}
</style>
<div class=trailing_no_leading></div>
<script>
test(() => {
let e = document.querySelector('.trailing_no_leading');
assert_equals(getComputedStyle(e).getPropertyValue('--x'), 'PASS');
}, 'Trailing declarations apply after any preceding rules (no leading)');
</script>
<style>
.trailing_multiple {
--x: FAIL;
--y: FAIL;
--z: FAIL;
--w: FAIL;
& { --x: FAIL; }
--x: PASS;
--y: PASS;
& { --z: FAIL; }
--z: PASS;
--w: PASS;
}
</style>
<div class=trailing_multiple></div>
<script>
test(() => {
let e = document.querySelector('.trailing_multiple');
let s = getComputedStyle(e);
assert_equals(s.getPropertyValue('--x'), 'PASS');
assert_equals(s.getPropertyValue('--y'), 'PASS');
assert_equals(s.getPropertyValue('--z'), 'PASS');
assert_equals(s.getPropertyValue('--w'), 'PASS');
}, 'Trailing declarations apply after any preceding rules (multiple)');
</script>
<style>
.trailing_specificity {
--x: FAIL;
:is(&, div.nomatch2) { --x: PASS; } /* Specificity: (0, 1, 1) */
--x: FAIL; /* Specificity: (0, 1, 0) */
}
</style>
<div class=trailing_specificity></div>
<script>
test(() => {
let e = document.querySelector('.trailing_specificity');
assert_equals(getComputedStyle(e).getPropertyValue('--x'), 'PASS');
}, 'Nested declarations rule has same specificity as outer selector');
</script>
<style>
#nomatch, .specificity_top_level {
--x: FAIL;
:is(&, div.nomatch2) { --x: PASS; } /* Specificity: (0, 1, 1) */
--x: FAIL; /* Specificity: (0, 1, 0). In particular, this does not have
specificity like :is(#nomatch, .specificity_top_level). */
}
</style>
<div class=specificity_top_level></div>
<script>
test(() => {
let e = document.querySelector('.specificity_top_level');
assert_equals(getComputedStyle(e).getPropertyValue('--x'), 'PASS');
}, 'Nested declarations rule has top-level specificity behavior');
</script>
<style>
#nomatch, .specificity_top_level_max, div.specificity_top_level_max {
--x: FAIL;
:is(:where(&), div.nomatch2) { --x: FAIL; } /* Specificity: (0, 1, 1) */
--x: PASS; /* Specificity: (0, 1, 1) (for div.specificity_top_level_max) */
}
</style>
<div class=specificity_top_level_max></div>
<script>
test(() => {
let e = document.querySelector('.specificity_top_level_max');
assert_equals(getComputedStyle(e).getPropertyValue('--x'), 'PASS');
}, 'Nested declarations rule has top-level specificity behavior (max matching)');
</script>
<style>
.nested_pseudo::after {
--x: FAIL;
@media (width > 0px) {
--x: PASS;
}
}
</style>
<div class=nested_pseudo></div>
<script>
test(() => {
let e = document.querySelector('.nested_pseudo');
assert_equals(getComputedStyle(e, '::after').getPropertyValue('--x'), 'PASS');
}, 'Bare declartaion in nested grouping rule can match pseudo-element');
</script>
<style>
#nomatch, .nested_group_rule {
--x: FAIL;
@media (width > 0px) {
--x: FAIL; /* Specificity: (0, 1, 0) */
}
--x: PASS;
}
</style>
<div class=nested_group_rule></div>
<script>
test(() => {
let e = document.querySelector('.nested_group_rule');
assert_equals(getComputedStyle(e).getPropertyValue('--x'), 'PASS');
}, 'Nested group rules have top-level specificity behavior');
</script>
<style>
.nested_scope_rule {
div:where(&) { /* Specificity: (0, 0, 1) */
--x: PASS;
}
@scope (&) {
--x: FAIL; /* Specificity: (0, 0, 0) */
}
}
</style>
<div class=nested_scope_rule></div>
<script>
test(() => {
let e = document.querySelector('.nested_scope_rule');
assert_equals(getComputedStyle(e).getPropertyValue('--x'), 'PASS');
}, 'Nested @scope rules behave like :where(:scope)');
</script>
<style>
.nested_scope_rule_trailing {
div:where(&) { /* Specificity: (0, 0, 1) */
--x: PASS;
}
@scope (&) {
--ignored: 1;
.ignored {}
--x: FAIL; /* Specificity: (0, 0, 0) */
}
}
</style>
<div class=nested_scope_rule_trailing></div>
<script>
test(() => {
let e = document.querySelector('.nested_scope_rule_trailing');
assert_equals(getComputedStyle(e).getPropertyValue('--x'), 'PASS');
}, 'Nested @scope rules behave like :where(:scope) (trailing)');
</script>
<style id=set_parent_selector_text_style>
.set_parent_selector_text {
div {
color: red;
}
.a1 {
& { color: green };
}
}
</style>
<div class=set_parent_selector_text>
<div class=a1>A1</div>
<div class=a2>A2</div>
</div>
<script>
test(() => {
let a1 = document.querySelector('.set_parent_selector_text > .a1');
let a2 = document.querySelector('.set_parent_selector_text > .a2');
assert_equals(getComputedStyle(a1).color, 'rgb(0, 128, 0)');
assert_equals(getComputedStyle(a2).color, 'rgb(255, 0, 0)');
let rules = set_parent_selector_text_style.sheet.cssRules;
assert_equals(rules.length, 1);
assert_equals(rules[0].cssRules.length, 2);
let a_rule = rules[0].cssRules[1];
assert_equals(a_rule.selectorText, '& .a1');
a_rule.selectorText = '.a2';
assert_equals(getComputedStyle(a1).color, 'rgb(255, 0, 0)');
assert_equals(getComputedStyle(a2).color, 'rgb(0, 128, 0)');
}, 'Nested declarations rule responds to parent selector text change');
</script>
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