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<!DOCTYPE HTML>
<html>
<script>
new Worker("data:text/javascript;charset=UTF-8,postMessage('HELLO')", {type: "module"});
</script>
<body>
Hello World!
</body>
</html>
<!DOCTYPE HTML>
<html>
<script>
new Worker("data:text/javascript;charset=UTF-8,postMessage('HELLO')", {type: "module"});
</script>
<body>
Hello World!
</body>
</html>