required attribute

<input required ='required'>

Explanation

Required attribute is used to make the form invalidated, when user fails/forgets to enter values in input field.

Example Code:

<form action="demo6.php">
  Username:<br> <input type="text" name="name" required="required" /><br>
  DOB:<br> <input type="text" name="dob" required="required" /><br>
  Contact Num:<br> <input type="text" name="num" required="required" /><br>
  Email ID:<br> <input type="text" name="mail" required="required" /><br><br>
  <input type="submit" />
</form>

Result :

User must enter values in all the input fields or else the form will not be validated.
It is a "Boolean Attribute".

Limitations:

It will function only in Opera, Firefox and Chrome browsers.

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