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nested-declarations-cssom.html
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<!DOCTYPE html>
<title>CSS Nesting: CSSNestedDeclarations CSSOM</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>
<script>
test(() => {
let s = new CSSStyleSheet();
s.replaceSync(`
.a {
& { --x:1; }
--x:2;
}
`);
assert_equals(s.cssRules.length, 1);
let outer = s.cssRules[0];
assert_equals(outer.cssRules.length, 2);
assert_equals(outer.cssRules[0].cssText, `& { --x: 1; }`);
assert_equals(outer.cssRules[1].cssText, `--x: 2;`);
}, 'Trailing declarations');
test(() => {
let s = new CSSStyleSheet();
s.replaceSync(`
.a {
--a:1;
--b:1;
& { --c:1; }
--d:1;
--e:1;
& { --f:1; }
--g:1;
--h:1;
--i:1;
& { --j:1; }
--k:1;
--l:1;
}
`);
assert_equals(s.cssRules.length, 1);
let outer = s.cssRules[0];
assert_equals(outer.cssRules.length, 6);
assert_equals(outer.cssRules[0].cssText, `& { --c: 1; }`);
assert_equals(outer.cssRules[1].cssText, `--d: 1; --e: 1;`);
assert_equals(outer.cssRules[2].cssText, `& { --f: 1; }`);
assert_equals(outer.cssRules[3].cssText, `--g: 1; --h: 1; --i: 1;`);
assert_equals(outer.cssRules[4].cssText, `& { --j: 1; }`);
assert_equals(outer.cssRules[5].cssText, `--k: 1; --l: 1;`);
}, 'Mixed declarations');
test(() => {
let s = new CSSStyleSheet();
s.replaceSync(`
.a {
& { --x:1; }
--y:2;
--z:3;
}
`);
assert_equals(s.cssRules.length, 1);
let outer = s.cssRules[0];
assert_equals(outer.cssRules.length, 2);
let nested_declarations = outer.cssRules[1];
assert_true(nested_declarations instanceof CSSNestedDeclarations);
assert_equals(nested_declarations.style.length, 2);
assert_equals(nested_declarations.style.getPropertyValue('--x'), '');
assert_equals(nested_declarations.style.getPropertyValue('--y'), '2');
assert_equals(nested_declarations.style.getPropertyValue('--z'), '3');
}, 'CSSNestedDeclarations.style');
test(() => {
let s = new CSSStyleSheet();
s.replaceSync(`
.a {
@media (width > 100px) {
--x:1;
--y:1;
.b { }
--z:1;
}
--w:1;
}
`);
assert_equals(s.cssRules.length, 1);
let outer = s.cssRules[0];
assert_equals(outer.cssRules.length, 2);
// @media
let media = outer.cssRules[0];
assert_equals(media.cssRules.length, 3);
assert_true(media.cssRules[0] instanceof CSSNestedDeclarations);
assert_equals(media.cssRules[0].cssText, `--x: 1; --y: 1;`);
assert_equals(media.cssRules[1].cssText, `& .b { }`);
assert_true(media.cssRules[2] instanceof CSSNestedDeclarations);
assert_equals(media.cssRules[2].cssText, `--z: 1;`);
assert_true(outer.cssRules[1] instanceof CSSNestedDeclarations);
assert_equals(outer.cssRules[1].cssText, `--w: 1;`);
}, 'Nested group rule');
test(() => {
let s = new CSSStyleSheet();
s.replaceSync(`
.a {
@scope (.foo) {
--x:1;
--y:1;
.b { }
--z:1;
}
--w:1;
}
`);
assert_equals(s.cssRules.length, 1);
let outer = s.cssRules[0];
if (window.CSSScopeRule) {
assert_equals(outer.cssRules.length, 2);
// @scope
let scope = outer.cssRules[0];
assert_true(scope instanceof CSSScopeRule);
assert_equals(scope.cssRules.length, 3);
assert_true(scope.cssRules[0] instanceof CSSNestedDeclarations);
assert_equals(scope.cssRules[0].cssText, `--x: 1; --y: 1;`);
assert_equals(scope.cssRules[1].cssText, `.b { }`); // Implicit :scope here.
assert_true(scope.cssRules[2] instanceof CSSNestedDeclarations);
assert_equals(scope.cssRules[2].cssText, `--z: 1;`);
assert_true(outer.cssRules[1] instanceof CSSNestedDeclarations);
assert_equals(outer.cssRules[1].cssText, `--w: 1;`);
} else {
assert_equals(outer.cssRules.length, 0);
}
}, 'Nested @scope rule');
test(() => {
let s = new CSSStyleSheet();
s.replaceSync(`
a {
& { --x:1; }
width: 100px;
height: 200px;
color:hover {}
--y: 2;
}
`);
assert_equals(s.cssRules.length, 1);
let outer = s.cssRules[0];
assert_equals(outer.cssRules.length, 4);
assert_equals(outer.cssRules[0].cssText, `& { --x: 1; }`);
assert_equals(outer.cssRules[1].cssText, `width: 100px; height: 200px;`);
assert_equals(outer.cssRules[2].cssText, `& color:hover { }`);
assert_equals(outer.cssRules[3].cssText, `--y: 2;`);
}, 'Inner rule starting with an ident');
test(() => {
let s = new CSSStyleSheet();
s.replaceSync('.a {}');
assert_equals(s.cssRules.length, 1);
let a_rule = s.cssRules[0];
assert_equals(a_rule.cssRules.length, 0);
a_rule.insertRule(`
width: 100px;
height: 200px;
`);
assert_equals(a_rule.cssRules.length, 1);
assert_true(a_rule.cssRules[0] instanceof CSSNestedDeclarations);
assert_equals(a_rule.cssRules[0].cssText, `width: 100px; height: 200px;`);
}, 'Inserting a CSSNestedDeclaration rule into style rule');
test(() => {
let s = new CSSStyleSheet();
s.replaceSync('.a { @media (width > 100px) {} }');
assert_equals(s.cssRules.length, 1);
assert_equals(s.cssRules[0].cssRules.length, 1);
let media_rule = s.cssRules[0].cssRules[0];
assert_true(media_rule instanceof CSSMediaRule);
assert_equals(media_rule.cssRules.length, 0);
media_rule.insertRule(`
width: 100px;
height: 200px;
`);
assert_equals(media_rule.cssRules.length, 1);
assert_true(media_rule.cssRules[0] instanceof CSSNestedDeclarations);
assert_equals(media_rule.cssRules[0].cssText, `width: 100px; height: 200px;`);
}, 'Inserting a CSSNestedDeclaration rule into nested group rule');
test(() => {
let s = new CSSStyleSheet();
s.replaceSync('@media (width > 100px) {}');
assert_equals(s.cssRules.length, 1);
let media_rule = s.cssRules[0];
assert_true(media_rule instanceof CSSMediaRule);
assert_equals(media_rule.cssRules.length, 0);
assert_throws_dom('SyntaxError', () => {
media_rule.insertRule(`
width: 100px;
height: 200px;
`);
});
}, 'Attempting to insert a CSSNestedDeclaration rule into top-level @media rule');
test(() => {
let sheet = new CSSStyleSheet();
assert_throws_dom('SyntaxError', () => {
sheet.insertRule(`
width: 100px;
height: 200px;
`);
});
}, 'Attempting to insert a CSSNestedDeclaration rule into a stylesheet');
test(() => {
let s = new CSSStyleSheet();
s.replaceSync('.a {}');
assert_equals(s.cssRules.length, 1);
let a_rule = s.cssRules[0];
assert_equals(a_rule.cssRules.length, 0);
assert_throws_dom('SyntaxError', () => {
a_rule.insertRule('');
});
}, 'Attempting to insert a CSSNestedDeclaration rule, empty block');
test(() => {
let s = new CSSStyleSheet();
s.replaceSync('.a {}');
assert_equals(s.cssRules.length, 1);
let a_rule = s.cssRules[0];
assert_equals(a_rule.cssRules.length, 0);
assert_throws_dom('SyntaxError', () => {
a_rule.insertRule(`
xwidth: 100px;
xheight: 200px;
`);
});
}, 'Attempting to insert a CSSNestedDeclaration rule, all invalid declarations');
</script>