On Nov 29, 2012, at 7:19 PM, Alex Russell <slightly...@google.com> wrote:

> My object is somewhat different. I think it's useful for the readability 
> use-case (and the other proposed "solutions" are mostly bad jokes), but it 
> doesn't strike me that this give you much default UI and doesn't plumb 
> through any new low-level capability.
> 
> In that vein, I wonder why it's not being proposed as an ARIA role instead?

'main' is already one of the subclass roles of landmark[1], many of which have 
have direct 1:1 default role mappings to new HTML5 elements (e.g. 
nav[role=navigation], footer[role=contentinfo]) and the proposal is, in part, 
to have an element on which to hang the default semantics of the 'main' 
landmark role. The accessibility role default is one important argument, but 
there were several others raised in favor of the element, including the 
semantic clarity or heuristic ease for readability/reader that you mentioned, 
as well as CSS hooks, script hooks, and other organizational benefit for 
content authors.

1. http://www.w3.org/TR/wai-aria/complete#landmark

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