required Attribute
The required attribute specifies that before submitting an input field must be filled out .Note: The required attribute works with the following <input> types: text, search, url, telephone, email, password, date pickers, number, checkbox, radio, and file.
Syntax
Name: <input type="text" name="user_name" required="required" />
Example
<!DOCTYPE html><html>
<body>
<form action="demo_form.asp" method="get">
Name: <input type="text" name="user_name" required="required" />
<input type="submit" />
</form>
</body>
</html>
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