87 lines
3.1 KiB
HTML
87 lines
3.1 KiB
HTML
<!doctype html>
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<title>CSS Selectors parsing</title>
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<link rel="author" title="Adam Argyle" href="mailto:argyle@google.com">
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<link rel="author" title="Tab Atkins-Bittner" href="https://tabatkins.com/contact/">
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<link rel="help" href="https://drafts.csswg.org/css-nesting-1/">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<style id="test-sheet"></style>
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<script>
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let [ss] = document.styleSheets
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function resetStylesheet() {
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while (ss.rules.length)
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ss.removeRule(0)
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}
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function testNestedSelector(sel, {expected=sel, parent=".foo"}={}) {
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resetStylesheet();
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const ruleText = `${parent} { ${sel} { color: green; }}`
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test(()=>{
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ss.insertRule(ruleText);
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assert_equals(ss.rules.length, 1, "Outer rule should exist.");
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const rule = ss.rules[0];
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assert_equals(rule.cssRules.length, 1, "Inner rule should exist.");
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const innerRule = rule.cssRules[0];
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assert_equals(innerRule.selectorText, expected, `Inner rule's selector should be "${expected}".`);
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}, ruleText);
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}
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function testInvalidNestingSelector(sel, {parent=".foo"}={}) {
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resetStylesheet();
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const ruleText = `${parent} { ${sel} { color: green; }}`
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test(()=>{
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ss.insertRule(ruleText);
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assert_equals(ss.rules.length, 1, "Outer rule should exist.");
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const rule = ss.rules[0];
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assert_equals(rule.cssRules.length, 0, "Inner rule should not exist.");
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}, "INVALID: " + ruleText);
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}
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// basic usage
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testNestedSelector("&");
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testNestedSelector("&.bar");
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testNestedSelector("& .bar");
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testNestedSelector("& > .bar");
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// relative selector
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testNestedSelector("> .bar", {expected:"& > .bar"});
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testNestedSelector("> & .bar", {expected:"& > & .bar"});
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testNestedSelector("+ .bar &", {expected:"& + .bar &"});
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testNestedSelector("+ .bar, .foo, > .baz", {expected:"& + .bar, & .foo, & > .baz"});
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// implicit relative (and not)
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testNestedSelector(".foo", {expected:"& .foo"});
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testNestedSelector(".test > & .bar");
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testNestedSelector(".foo, .foo &", {expected:"& .foo, .foo &"});
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testNestedSelector(".foo, .bar", {expected:"& .foo, & .bar"});
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testNestedSelector(":is(.bar, .baz)", {expected:"& :is(.bar, .baz)"});
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testNestedSelector("&:is(.bar, .baz)");
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testNestedSelector(":is(.bar, &.baz)");
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testNestedSelector("&:is(.bar, &.baz)");
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// Mixing nesting selector with other simple selectors
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testNestedSelector("div&");
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testInvalidNestingSelector("&div"); // type selector must be first
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testNestedSelector(".class&");
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testNestedSelector("&.class");
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testNestedSelector("[attr]&");
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testNestedSelector("&[attr]");
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testNestedSelector("#id&");
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testNestedSelector("&#id");
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testNestedSelector(":hover&");
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testNestedSelector("&:hover");
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testNestedSelector(":is(div)&");
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testNestedSelector("&:is(div)");
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// Multiple nesting selectors
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testNestedSelector("& .bar & .baz & .qux");
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testNestedSelector("&&");
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// Selector list in inner rule
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testNestedSelector("& > section, & > article");
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// Selector list in both inner and outer rule.
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testNestedSelector("& + .baz, &.qux", {parent:".foo, .bar"});
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</script>
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