You can use WC3 Markup Validation Service to validate your html5.
I found it very helpful – at first, it came up with 5 errors for my blog and these were simple things, like tags I hadn’t closed properly, or in an instance, I had got confused with their order to close them. I fixed this – didn’t take more than 5 minutes – and now this blog validates as HTML5 markup.
It’s not the be-all-and-end-all of web development but it’s a good indication that you are on the right track when it comes to designing to web standards, which in turn is a way to ensure your website is forward-compatible and accessible.
You may also use W3C CSS3 Validation Service to validate your CSS.
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