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As mentioned above, we can improve on this by making use of the are already implicit so the input has to match the entire expression. If anyone wants to contribute a more thorough expression to test for valid email or url format, feel free to post it using the Feedback option above.. Since it is not possible to recurse when using a regular expression it is also not possible to create a truly accurate regex for doing email address validation.The value, clicking 'down' with the input blank will result in a very large number. The examples posted in these responses are vastly oversimplified when compared against reality.We have a separate article with details on validating passwords using HTML5, including Java Script code for customising the browser generated alert messages. You just need to pick one and then remove the portion that detects the protocol (xxx://).Other HTML5 input types include: -related options do have an effect at least in Opera, with pop-up calendars and other devices appearing to assist with input. But as you see, lots of strange looking URLs are actually valid.Fortunately, we can assume that all browsers supporting HTML5 form validation techniques will also support images being replaced in the CSS by 'Base64 encoded datasets'. When you select a “tel” or “email” field on your mobile browser, it could open your address book for you to pick a phone number or address from.Using a service such as Spritebaker or other techniques, the above style settings become: The above code can now be copied directly to your CSS style sheet. :[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f] | \[\x01-\x09\x0b\x0c\x0e-\x7f])*") @ (? The fallback for the placeholder attribute in this article is far from accurate.

In this article we intend to present only a number of simple examples to get you started, covering the basic form elements.There's no need to copy any images and, especially if your style-sheets are gzip-compressed, there will be next to no impact on load times. The main problem is that if the user doesn't enter a new value, the placeholder text will be submitted along with the form.In a few minutes you could have your whole website updated. I would highly recommend using one the various placeholder polyfill scripts if you want to support the placeholder attribute in older browsers: e.g.The simplest change you can make to your forms is to mark a text input field as 'required': This informs the (HTML5-aware) web browser that the field is to be considered mandatory.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.

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