Validating forms using html5
One study found that simply providing inline validation increased the successful completion rate by 22% and decreased time to completion by 42%.
Currently support for the new form and input elements is widespread on modern browsers, though there is often some difference in the way some pickers are displayed on desktop.
While there are Java Script helpers to do this, they can sometimes be annoying when they move focus after you’ve already started typing.The use of pattern ensure that the field value matches the correct format for a part number.If the required attribute is present, then the field must contain a value before the form can be submitted.There is even more up to date forms guidance on our new Web Fundamentals site.When used properly, these features make it significantly easier for users to provide the information needed, increasing completion rates, and improving accuracy.
In some cases, you may want to allow the user to submit the form even if it contains invalid input.