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In other web browsers they can be used in combination with the .
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.
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.
The following Java Script, placed or included at the end of the page, should enable support for the If you want email validation with RFC 5322 standard: \A(?
By validating form responses before accepting them, we can alert users to their errors before they submit the form.