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In my master layout file, I have the HTML5 doctype:
<!DOCTYPE html>
But, in one of my views, I have implemented a Twitter button, and Visual Studio is complaining. Code:
<a href="twitterurl..." class="twitter-hashtag-button" data-size="large" data-url="http://google.com">Tweet #Google</a>
The warning I get:
Warning Validation (XHTML 1.0 Transitional): Attribute 'data-size' is not a valid attribute of element 'a'.
I'm using ASP.NET MVC3 and Visual Studio 2010.
234
Came across this question whilst looking for the answer. The solution seems to change the validation type by going to Tools -> Options -> Text and choosing 'HTML5' as per image below
You may need VS210 Tools update to have that as an available option.
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