Using an HTML5 Theme in WordPress (and not breaking browsers)
I’m developing an HTML5 WordPress theme, but don’t want the site to be broken for visitors with browsers that don’t support it.
Luckily I found this post from Nathan Rice’s blog that describes a great way to get around that problem by serving a theme based on the user agent.
I’m also exploring the option to filter the html and css to try to convert it to lower versions