Cancel Button on a form with Required fields

The HTML5 tag parameter required is very handy except when you want to add a Cancel submit button. To allow the Cancel button to work without the browser giving an error on empty required fields, simply add the formnovalidate parameter to the Cancel button. Here's an abbreviated form showing the parameter in use:

<form>
    <label>Email: <input type="email" name="email" required></label>
    <input type="submit" name="submit" value="Submit">
    <input type="submit" name="submit" value="Cancel" formnovalidate>
</form>