13 lines
211 B
HTML
13 lines
211 B
HTML
<!DOCTYPE html>
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<html>
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<head>
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<style>
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fieldset:valid { 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 readonly>
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</fieldset>
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</body>
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</html>
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