Error validating current user and server

Writing effective form validation is not just about the errors themselves; it's equally important to show the errors to the user in a usable way, and supporting browsers give you CSS hooks to do just that.

In this tutorial I will: Per the spec how errors are presented to the user is left up to the browser itself.

However, the spec does provide a full DOM API, new HTML attributes, and CSS hooks authors can use to customize the experience.



= Element By Id('password2').value) { Element By Id('password1')Custom Validity('Passwords must match.'); } else { Element By Id('password1')Custom Validity(''); } Try It When the "Validate" button is clicked form submission will be prevented because of the empty input.

However, when the "Do NOT Validate" button is clicked the form will submit despite the invalid data because of the attribute.


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