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Test Info:

<!DOCTYPE html>
<html class="test-wait">
<title>Chrome issue 567611695</title>
<link rel="help" href="https://crbug.com/567611695">
<script>
const w = new Worker(URL.createObjectURL(new Blob([`
const x = new OffscreenCanvas(1, 1).getContext('2d');
x.filter = 'blur(calc(1px * sign(1%))) ';
x.fillRect(0, 0, 1, 1);
postMessage(0);
`])));
w.onmessage = () => {
w.terminate();
document.documentElement.className = "";
};
</script>