​x
 
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<!DOCTYPE html>
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<title>Example</title>
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<style>
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    :lang(fr) {
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        color: yellowgreen;
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    }
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    :lang(en) {
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        color: orange;
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    }
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</style>
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​
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<h1 lang="fr">Bonjour</h1>
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<h1 lang="en">Hello</h1>