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<!DOCTYPE html>
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<head>
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<style class="foo">
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body { color: red; }
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</style>
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<script>
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document.styleSheets[0].insertRule("body { color: green; }", 1);
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document.querySelector("style").removeAttribute("class");
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</script>
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</head>
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<body>
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This text should be green
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</body>
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