Validating data sfai
We can achieve this by adding a pattern attribute to the 'Name' field, setting it's value to the regular expression we want the data to be compared against: The text in the title attribute is then appended to the built-in validation message: Note that some screen reader / browser combinations might lead to the title attribute being read out in addition to the aria-describedby text, so watch out for this e.g.
Required fields can use the Now, in addition to showing the help text when the input field receives focus, we'll also show the help text when the input field's value is invalid.
One option is to not do anything and rely on your server-side validation only.
This would require no extra work on your part, but would the UX for those using unsupported browsers be satisfactory?
So if an older browser doesn't support them, the fact that they're in the HTML won't 'break' anything, they’ll just be rendered as an NB While client-side form validation is great for enhancing user experience—fast, instant feedback to the user without making a round trip to the server—you will still need to validate any data submitted on the server, too.
Let's walk through an example of how we can validate a form using only the browser's built in validation.