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Validating the MailChimp subscribe form with vanilla JavaScript

Over the last few articles in this series, we’ve learned how to use a handful of input types and validation attributes to natively validate forms.

We’ve learned how to use the Constraint Validation API to enhance the native browser validation process for a better overall user experience. And we wrote a polyfill to extend support all the way back to IE9 (and plug a few feature holes in some newer versions).

In my final post on CSS Tricks, let’s take what we’ve learned and apply it to a real example: the MailChimp signup form.


🚀 Make 2018 the year you master JavaScript! My pocket guides and mini courses are short, focused, and made for beginners. You can do this!

Have any questions or comments about this post? Email me at chris@gomakethings.com or contact me on Twitter at @ChrisFerdinandi.

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