What is the difference between the hidden attribute (HTML5) and the display:none rule (CSS)?

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The key difference seems to be that hidden elements are always hidden regardless of the presentation:

The hidden attribute must not be used to hide content that could legitimately be shown in another presentation. For example, 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. It is similarly incorrect to use this attribute to hide content just from one presentation — if something is marked hidden, it is hidden from all presentations, including, for instance, screen readers.

http://dev.w3.org/html5/spec/Overview.html#the-hidden-attribute

Since CSS can target different media/presentation types, display: none will be dependent on a given presentation. E.g. some elements might have display: none when viewed in a desktop browser, but not a mobile browser. Or, be hidden visually but still available to a screen-reader.

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