Source Code:
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Submit
Result:
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<!DOCTYPE html> <html> <head> <title>Title of the document</title> </head> <body> <form action="/form/submit" method="post"> <select name="books" required> <option value="">Books</option> <option value="html">HTML</option> <option value="css">CSS</option> </select> <input type="submit"> </form> </body> </html>