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<!DOCTYPE html>
<title>CSS Cascade Layers: CSSStyleSheet.replaceSync clears stale statements</title>
<link rel="author" href="mailto:xiaochengh@chromium.org">
<link rel="help" href="https://www.w3.org/TR/css-cascade-5/#layering">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="target"></div>
<div id="reference" style="color: green"></div>
<script>
// In all test cases, the 'color' property value of #target should be green.
const testCases = [
{
title: 'replaceSync clears stale layer statements',
style: `
@layer second, first;
@layer second {
#target { color: green; }
}
@layer first {
#target { color: red; }
}
`,
operations: function(sheet) {
sheet.replaceSync(`
@layer first {
#target { color: red; }
}
@layer second {
#target { color: green; }
}
`);
}
},
];
const target = document.getElementById('target');
const reference = document.getElementById('reference');
for (let testCase of testCases) {
test(t => {
let sheet = new CSSStyleSheet();
sheet.replaceSync(testCase.style);
document.adoptedStyleSheets = [sheet];
try {
testCase.operations(sheet);
assert_equals(getComputedStyle(target).color, getComputedStyle(reference).color);
} finally {
document.adoptedStyleSheets = [];
}
}, testCase.title);
}
</script>
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