ladybird/Tests/LibWeb/Text/input/css/CSSStyleDeclaration-modify-computed.html

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<!DOCTYPE html>
<script src="../include.js"></script>
<script>
test(() => {
try {
document.defaultView.getComputedStyle(document.documentElement, null).setProperty("foo", "bar");
println("FAIL");
} catch (e) {
println(`Calling setProperty() on a computed CSSStyleDeclaration throws error of type: ${e.name}`);
}
try {
document.defaultView.getComputedStyle(document.documentElement, null).removeProperty("foo");
println("FAIL");
} catch (e) {
println(`Calling removeProperty() on a computed CSSStyleDeclaration throws error of type: ${e.name}`);
}
});
</script>