14 lines
248 B
HTML
14 lines
248 B
HTML
<!DOCTYPE html>
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<!--fieldset with only invalid elements -->
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<html>
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<head>
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<style>
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fieldset:invalid { display: none; }
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</style>
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</head>
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<body>
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<fieldset id="fieldset">
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<input required>
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</fieldset>
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</body>
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</html>
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