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Test Info:

<!doctype html>
<style>
@property --my-url {
syntax: "<url> | none";
inherits: true;
initial-value: none;
}
:root {
--my-url: url(blah);
}
* {
--foo: var(--my-url);
}
</style>
<body>
<script>
// Get some styling off-thread.
for (let i = 0; i < 10000; ++i) {
document.body.appendChild(document.createElement("span"));
}
</script>