Regex in new pattern attr for HTML5 forms

I am just using HTML5 forms for the first time and I want to use the new pattern attribute. This is a regular expression (which I haven\'t used before) so I am 开发者_StackOverflow社区a bit lost. The

How do I style the HTML5 form validation error messages with CSS?

How do I sty开发者_JAVA百科le the HTML5 form validation error messages with CSS?Currently, there is no way to style those little validation tooltips. The only other option, which is what I have chosen

&nbsp causes a HTML5 validation fail

I\'m in the process of applying a \"HTM开发者_如何学GoL4.5\" approach to an existing XHTML1.0 Strict site. The idea is to change the doctype and apply semantic classes matching the new elements of HTM

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