Validating html file

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Client-side validation alone does not ensure security; therefore data needs to be validated on the server-side as well.Forms frequently include required input that needs to be clearly identified using labels.Most current web browsers support these features and handle input validation.Also, HTML5 validation helps users inputting data by providing specific controls, such as date pickers and custom on-screen keyboards.HTML5 input types are displayed as simple input fields in older web browsers that do not support these HTML5 features.The example below shows these HTML5 input types in action.Verification details are listed beneath each signature and can be viewed by expanding the signature. This feature analyzes the document for content that may alter the appearance of the document.

HTML5 defines a range of built-in functionality to validate common types of input, such as email addresses and dates.If your web browser supports HTML5, it will not allow you to submit the form without entering text into the input field.Instead, it will display a message that is generated by the web browser itself.You also specify the types of changes that are permitted for the document to remain certified.For example, suppose that a government agency creates a form with signature fields.

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