IE9 equivalent of querySelectorAll

Question

I haven\'t had any problems in FF or Chrome, but IE9 chucks an error on this method. I thought I would be able to use it, due to it having been shown to be supported here:

Answer 1

You need to use the html5 doctype for IE9 to work with the querySelectorAll() javascript method. The doctype looks like this and should be placed as the first line on all the pages in your site.