Validating forms in html
But the great thing about them is that they all degrade gracefully.
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.
They also help with accessibility, as the text in the label will be read out to screen reader users: it can therefore be useful to indicate required fields by adding ‘required’ to the label text, as I’ve done above.
It also means that if you click the label, the associated input tag receives the focus.I found that using NVDA with IE10 caused the title attribute and the aria-describedby element's text to be read out, but using NVDA with Chrome and Firefox didn’t exhibit this behaviour. Later on we’ll revisit this and show you one solution using CSS3.To make sure our user enters the right data in the email, website, and number of tickets fields, we can use some of the new input types added in HTML5: By specifying the appropriate type, our browser will validate the data for us and make sure we've got an email address in the email field, a URL in the website field, and a number in the number of tickets field.The idea is to create a set of “validation descriptors” associated with each element in a form.The “validation descriptor” is nothing but a string specifying the type of validation to be performed.