For these examples we have created our own valid/invalid CSS formatting to override the browser default. That's why you may see something like the following: Before you type anything into the box a red marker is shown.As soon as a single character has been entered this changes to a green marker to indicate that the input is 'valid'.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.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.Also each browser has a slightly different default behaviour.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.Update: Java 8 has introduced Date and Time API that provides utility method to add and subtract days, weeks, months etc from given date.
Here is how it appears in Safari (with our CSS formatting to show the (in)valid state): In a similar fashion to the Again, the input box appears as normal: This time the minimum requirement for most browsers is one or more letters followed by a colon. :[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f] | \[\x01-\x09\x0b\x0c\x0e-\x7f]) ) \])\z Or you can look here for more solutions.
For those you might want to place the valid/invalid markers alongside the element or format the input elements themselves using borders, background colours, etc. The "date" input AFAIK has only been implemented in Opera, but hopefully some day there will be cross-browser support for all the new types.
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(?
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.
Here is how the two inputs are displayed in Safari: and in Opera: They are currently not supported in Firefox 4 Beta. For example it is perfectly valid for an email address to go to the MX handler for a top level domain.