User-Friendly and Useful Data Validation
Let's start with looking at the customer experience. Imagine that you fill out a form and you make a mistake or forget to include some of the required information. Which is more useful to you, a pop-up with a potentially long list of errors, like this one:
Or is it more useful if the page layout shifts to explain the errors and highlight the fields that need to be changed, like this:
Explaination of GET and POST methods of form submittal from W3 School
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