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<!doctype html>
<title>CSS Selectors: :is() and :where() error recovery</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/3676">
<link rel="help" href="https://drafts.csswg.org/selectors-4/#matches">
<link rel="help" href="https://drafts.csswg.org/selectors-4/#zero-matches">
<link rel="help" href="https://drafts.csswg.org/selectors-4/#typedef-forgiving-selector-list">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style id="test-sheet">
random-selector { color: blue; }
</style>
<div id="test-div"></div>
<script>
let rule = document.getElementById("test-sheet").sheet.cssRules[0];
test(function() {
for (let pseudo of ["is", "where"]) {
rule.selectorText = "random-selector";
let invalidSelector = `:${pseudo}(:total-nonsense)`;
rule.selectorText = invalidSelector;
assert_not_equals(
rule.selectorText,
"random-selector",
"Should've parsed",
);
assert_not_equals(
rule.selectorText,
invalidSelector,
"Should not be considered valid and parsed as-is",
);
let emptyList = `:${pseudo}()`;
assert_equals(
rule.selectorText,
emptyList,
"Should be serialized as an empty selector-list",
);
assert_equals(document.querySelector(emptyList), null, "Should never match, but should parse");
for (let mixedList of [
`:${pseudo}(:total-nonsense, #test-div)`,
`:${pseudo}(:total-nonsense and-more-stuff, #test-div)`,
`:${pseudo}(weird-token || and-more-stuff, #test-div)`,
]) {
rule.selectorText = mixedList;
assert_equals(
rule.selectorText,
`:${pseudo}(#test-div)`,
`${mixedList}: Should ignore invalid selectors`,
);
let testDiv = document.getElementById("test-div");
assert_equals(document.querySelector(mixedList), testDiv, "Should correctly match");
assert_equals(getComputedStyle(testDiv).color, "rgb(0, 0, 255)", "test element should be blue");
}
}
});
</script>
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