The 'Validation RegEx' property field below will be disabled with the build-in standard validation rules. The default labels of the validation rules are configured in the node configurations ('ef:validationrulelabel' property). You can now specify a different message per field type, in regard of the validation rule that you've configured for a field. So for example, you can have different message for the regexp validator, depending on the type of field that is being validated. The following example shows an example handling a special validation rule for the specific use case. An Open Web advocate and front-end engineer, who loves everything mobile, and writes about HTML5, CSS, JS, UX, tech events, gadgets, etc.

My articles are licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. HTML5 specifications come with a full of goodness that make web developer's lives easier.
The one of the goodies, the client form validation is the one I like a lot, because, for example, by adding required attribute to an input, I don’t need to write any additional JavaScript to warn a user, when the user submits a form without filling out the required fields.
A user is required to enter values to match a regular expression pattern, in this case, a 13 to 16 digit number. 2) The built-in HTML5 message is displayed when the user submits the form while leaving the invalid entry. If you would make it prettier, I suggest you should place some icons as a background-image of the input, instead of just dumping some unicode char!

Also, the opinions expressed here are solely her own and do not express the views or opinions of my employer. According to this W3C Candidate Doc, there are additional pseudo-classes defined, such as :valid, invalid, in-range, out-of-range, required, optional, read-only and read-write.
However, it is not possible to add contents to the input with the CSS since input has no document tree content.

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