You're checking out on an e-commerce site. You click Submit, and the page reloads with an error message at the top: "There were errors in your submission." That's it. No indication of which fields have problems. No explanation of what's wrong. You start hunting through the form, checking each field, trying to figure out what went wrong.
This frustrating experience is unfortunately common, especially on e-commerce sites, membership portals, and complex forms. But it's also completely avoidable - and fixing it makes your site accessible and more usable for everyone.
