It sets and keeps the focus on the input field until the user supplies a valid value.
Let's walk through an example of how we can validate a form using only the browser's built in validation.
Take this simple booking form: attribute for the label tag matches up with the id attribute of the associated input tag.
function userid_validation(mx,my) // This function will validate Password.
The reason your current code doesn't work is because you don't have a FORM tag in there.
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.
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.
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