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HTML5 form required attribute. Set custom validation message?

I've got the following HTML5 form: http://jsfiddle.net/nfgfP/ 14 Answers 14 ...
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how to mix links ( tag ) and headings ( tag ) in web standard?

...n more: w3 Visual formatting model However, there is an exception that in HTML5 it is valid to wrap block-level elements (like div, p or h*) in anchor tags. Wrapping block-level elements in inline elements other than anchors still goes against the standards. ...
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CSS values using HTML5 data attribute [duplicate]

I want to know if there's any way it's possible to set a css value using HTML5's data- attribute the same way that you can set css content . Currently it doesn't work. ...
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Streaming via RTSP or RTP in HTML5

... I expect frequently changing support (or lack of support). From the W3C's HTML5 spec (The video element): User agents may support any video and audio codecs and container formats share | improve ...
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Can you require two form fields to match with HTML5?

Is there a way to require the entries in two form fields to match using HTML5? Or does this still have to be done with javascript? For example, if you have two password fields and want to make sure that a user has entered the same data in each field, are there some attributes, or other coding that c...
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Best way to synchronize local HTML5 DB (WebSQL Storage, SQLite) with a server (2 way sync) [closed]

...mobile web application (for iPhone & Android) with a local database (using html5 webstorage) so my app is still usable when the user is offline. ...
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Is there a way to make HTML5 video fullscreen?

Is there a way to play a video fullscreen using the HTML5 <video> tag? 21 Answers ...
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HTML5 Email Validation

It is said "With HTML5, we need no more js or a server side code to check if the user's input is a valid email or url address" ...
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HTML5 best practices; section/header/aside/article elements

There is enough information about HTML5 on the web (and also on stackoverflow), but now I'm curious about the "best practices". Tags like section/headers/article are new, and everyone has different opinions about when/where you should use these tags. So what do you guys think of the following layout...
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IE8 issue with Twitter Bootstrap 3

...ason the basic template contains these lines in the head section: <!-- HTML5 shim and Respond.js IE8 support of HTML5 elements and media queries --> <!--[if lt IE 9]> <script src="../../assets/js/html5shiv.js"></script> <script src="../../assets/js/respond.min.js">...