The documented semantics of the hidden attribute say otherwise https://developer.mozilla.org/en-US/docs/Web/HTML/Global_att... http://www.w3.org/html/wg/drafts/html/master/editing.html#th...

" it is incorrect to use hidden to hide panels in a tabbed dialog, because the tabbed interface is merely a kind of overflow presentation — one could equally well just show all the form controls in one big page with a scrollbar"