How does the HTML call the validation routine?

Answer 1

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Answer 2

HTML doesn't call the validation routine. It is mainly triggered by an event and this is done because of javascript. When the user clicks the Submit button on the form, the form data is sent to a JavaScript validation function that checks each aspect of the input to make sure that it is in the appropriate format. This function is invoked due to "onclick" or "onsubmit" action attribute. Each form element is evaluated according to specified criteria. If the script finds an error in one of the fields, it sends back a warning explaining how the string doesn't conform. The fairly robust string-handling and regular expression techniques available in JavaScript handle this checking process. This validation is done in the client side.