Before you ask, and someone always does, these examples will currently work in the following browsers: Safari 5, Chrome 6, Opera 9, Firefox 4 Beta and the i Phone/i Pad.
Also each browser has a slightly different default behaviour.
For a more detailed introduction to HTML5 form validation you can find some great articles linked under References below.
In this article we intend to present only a number of simple examples to get you started, covering the basic form elements.
Server side validation is performed by a web server, after input has been sent to the server.
Different browsers may mark the input box in some way (Firefox 4 Beta adds a red box-shadow by default), display a warning (Opera) or even prevent the form from being submitted if this field has no value.It's guaranteed to improve your website or your money back.CSE HTML Validator is used by federal, state, and local governments (in the US, Canada, UK, and other countries), by Fortune 500 companies, and by small businesses, individuals, schools and learning institutions.CSE HTML Validator to check HTML, XHTML, CSS, SEO, and more.CSE HTML Validator is for web professionals, webmasters, corporations, government agencies, individuals, teachers, students, non-profit organizations, or anyone with a website.