This contains some additional styling rules for error messages and headings. Form Input Validation Using Only HTML5 and Regex.If you want to learn more about client-side validation, check out those posts. You can also take client-side form validation to the next level with jQuery by getting more power over the error messages that are shown and their placement and appearance. You can read the tutorial titled Form Input Validation Using Only HTML5 and Regex if you want to learn more about the topic. Similarly, the use of the pattern attribute on the username will make sure that the username only consists of alphanumeric characters. For instance, the use of type="email" will alert users when the email address that they entered isn't in the proper format. The form is very basic, but we do use HTML5 to do some very basic input validation.
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