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<!DOCTYPE html>
<html>
<body>
<script>
var x = document.createElement('span');
x.attachShadow({ mode: "open" });
x.id = 'a';
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<body>
<script>
var x = document.createElement('span');
x.attachShadow({ mode: "open" });
x.id = 'a';
</script>
</body>
</html>