HTML5 form required attribute. Set custom validation message?

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Here is the code to handle custom error message in HTML5:

<input type="text" id="username" required placeholder="Enter Name"
  oninvalid="this.setCustomValidity('Enter User Name Here')"
  oninput="this.setCustomValidity('')"/>

This part is important because it hides the error message when the user inputs new data:

oninput="this.setCustomValidity('')"

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