Remove mention of itemprop from W3C HTML spec.

Fixes W3C bug: https://www.w3.org/Bugs/Public/show_bug.cgi?id=19661
[giow] (0) Add supportsContext()
Affected topics: Canvas, DOM APIs

git-svn-id: http://svn.whatwg.org/webapps@7482 340c8d12-0b0e-0410-8428-c7bf67bfef74
(cherry picked from commit 6e1081a860afd08e6aa0329032c9cf4106760a27)

Fixes W3C bug: https://www.w3.org/Bugs/Public/show_bug.cgi?id=19677
[e] (0) Fix some typos or copypasta.
Affected topics: Canvas, DOM APIs, HTML

git-svn-id: http://svn.whatwg.org/webapps@7483 340c8d12-0b0e-0410-8428-c7bf67bfef74
(cherry picked from commit 90c0786311cd92d5a4fd1c546e6a8a766c6d3b2c)

Fixes W3C bug: https://www.w3.org/Bugs/Public/show_bug.cgi?id=19677
[giow] (2) The parser should have mutation observers.
Affected topics: HTML, HTML Syntax and Parsing

git-svn-id: http://svn.whatwg.org/webapps@7484 340c8d12-0b0e-0410-8428-c7bf67bfef74
(cherry picked from commit b45da726fbd8dfb3603de931ef5fcc1ebd67a109)

Clarifies DOM mutation observers
Replacing Anne with Simon as author of HTML4 differences doc.
Picked from WHATWG patch:
https://github.com/w3c/html/commit/0e5f355bd059d8857a44505757da025f21e2efb7
Fix s/implied ARIA semantics/implicit ARIA semantics/.
Fix some references.

Closes W3C bug: https://www.w3.org/Bugs/Public/show_bug.cgi?id=18364
[Editorial] Update revision number up to which WHATWG changes have been
merged.
The WHATWG hasn't called its specification 'Web Applications 1.0' for several years now.
Removing td/th 'abbr' from obsolete features list, per resolution of https://www.w3.org/Bugs/Public/show_bug.cgi?id=13614
[e] (0) What a world we are coming to, where even the editor's versions of specs are versioned.
Affected topics: HTML

git-svn-id: http://svn.whatwg.org/webapps@7486 340c8d12-0b0e-0410-8428-c7bf67bfef74
(cherry picked from commit 0d979dff9e38ce6b384341a00eaae44fb56a4e45)

Update of reference to CSS Image Values and Replaced Content Module
[e] (0) The text as written before didn't really make any sense.
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=18604
Affected topics: HTML

git-svn-id: http://svn.whatwg.org/webapps@7487 340c8d12-0b0e-0410-8428-c7bf67bfef74
(cherry picked from commit 4687558ce0ed676b0730e68b16426faa71e37834)

Closes W3C bug: https://www.w3.org/Bugs/Public/show_bug.cgi?id=19851
[giow] (0) Abort was a little over-enthusiastic.
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=18413
Affected topics: HTML

git-svn-id: http://svn.whatwg.org/webapps@7488 340c8d12-0b0e-0410-8428-c7bf67bfef74
(cherry picked from commit 5682a70607959eab08655fce872cd46ad73ce800)

Closes W3C bug: https://www.w3.org/Bugs/Public/show_bug.cgi?id=19852
[giow] (0) I was wrong when I did this.
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=18789
Affected topics: DOM APIs, Microdata

git-svn-id: http://svn.whatwg.org/webapps@7489 340c8d12-0b0e-0410-8428-c7bf67bfef74
(cherry picked from commit aedfbfe82bf4b452189b4446403d6508eaebf399)

Fixes W3C bug: https://www.w3.org/Bugs/Public/show_bug.cgi?id=18278
[e] (0) Add a note saying that CSS list rendering is not yet defined.
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=17632
Affected topics: Rendering

git-svn-id: http://svn.whatwg.org/webapps@7491 340c8d12-0b0e-0410-8428-c7bf67bfef74
(cherry picked from commit c94cdeadf2b9f91e5a6a83ba82724e3c57716f10)

Closes W3C bug: https://www.w3.org/Bugs/Public/show_bug.cgi?id=18260
[giow] (3) Be more strict about what <script type=''> handling should look like.
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=16887
Affected topics: HTML

git-svn-id: http://svn.whatwg.org/webapps@7493 340c8d12-0b0e-0410-8428-c7bf67bfef74
(cherry picked from commit ec5dd89bfb2afdf101d6367426cb9adcbd3aca20)

Fixes W3C bug: https://www.w3.org/Bugs/Public/show_bug.cgi?id=18133
[giow] (1) Prevent a race condition between <video onerror> and <body onload>
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=18570
Affected topics: Video and Audio

git-svn-id: http://svn.whatwg.org/webapps@7494 340c8d12-0b0e-0410-8428-c7bf67bfef74
(cherry picked from commit 17cedfa25ca340a4af4eb248db18f57b751208b4)

Closes W3C bug: https://www.w3.org/Bugs/Public/show_bug.cgi?id=19853
[e] (0) Clarify that 'directionality' applies to all elements.
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=18339
Affected topics: HTML

git-svn-id: http://svn.whatwg.org/webapps@7495 340c8d12-0b0e-0410-8428-c7bf67bfef74
(cherry picked from commit fcca364e971a12b2c9bccc81440e0f6622b030da)
[e] (0) Match Selectors terminology better
Affected topics: HTML

git-svn-id: http://svn.whatwg.org/webapps@7496 340c8d12-0b0e-0410-8428-c7bf67bfef74
(cherry picked from commit 42cafdc36c72315f8ecfc802d6c6b0100c22c38f)
[giow] (3) Try to get a little closer to browsers.
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=18707
Affected topics: HTML Syntax and Parsing

git-svn-id: http://svn.whatwg.org/webapps@7497 340c8d12-0b0e-0410-8428-c7bf67bfef74
(cherry picked from commit 44de111e07bc56cb2ee3ddb87e42b3a83602c457)

(clarify document.write on document load events)
[giow] (3) Another attempt at defining tabindex, :disabled, what can be focused, etc.
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=16018
Affected topics: HTML

git-svn-id: http://svn.whatwg.org/webapps@7498 340c8d12-0b0e-0410-8428-c7bf67bfef74
(cherry picked from commit fa5f20cdde3075c3c01fb89cf8858ba5cb513641)

Closes W3C bug: https://www.w3.org/Bugs/Public/show_bug.cgi?id=18065