Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions.
Consider email address RFCs:
Look at HTML5 form input element (with type=email) regex pattern:
The viewer will learn the benefit of using external CSS files and the relationship between class and ID selectors.
Create your external css file by saving it as style.css then set up your style tags:
Reference the nav tag and set your prop…