[Bug 7483] The footer element desperately needs to be able to contain sectioning content descendents, most importantly "nav". Under the current specification, I will just end up using div class="footer" so my footers can contain sectioning content.
[Bug 7543] Consensus on ietf-http-wg was that repetition of relations is meaningless and we should rather use numbering (e.g. "up2"), names (e.g. "great-grandparent") or an attribute (e.g. level="3").
[Bug 7550] The invalid event does have a default action. Namely to display UI. However, UAs should probably not be forbidden to show that a field is invalid before submitting, but how can page author suppress the UI for that?
[Bug 7599] Either drop the two places that set the "Origin" HTTP header, or update HTML5 to match the Sec-From/Origin I-D (if the latter is stable enough yet).
[Bug 7628] The later 'block' box container should simply map to the first/last dd element. This makes UA implementations easier and script emulation of the feature in contemporary UAs as well. Both can simply toggle the display property between block and none.
[Bug 7643] Why not use display:none instead of overflow:hidden; height:0? display:none seems to have the desired behavior in terms of exposure to AT and keyboard navigation in browsers.
[Bug 7649] It would be useful to see an example of how section works when it's not in the context of an article, in the example text (chapters, tabs, etc) all of those would sit inside a wrapping article element.
[Bug 7660] The resource selection algorithm should set currentSrc in the sync section before invoking resource fetch instead of being set in the async resource fetch. Otherwise checking currentSrc in onloadstart is not reliable.
[Bug 7672] </p> shouldn't be ignored in "before html", "before head", "in head", "in head noscript", "after head". It should be reprocessed through to "in body" like </br>.
[Bug 7674] are the chunks for inputs having the content-type header for each chunk specified appropriately? e.g. file inputs should set the header according to the file selected by the user
[Bug 7677] Is there any behavior defined for setting the src property. For example, is the expectation that object should (A) load the src if autobuffer is true (B) stop playing if currently playing (C) something else (D) nothing at all?
[Bug 7734] open being an attribute of the section rather than the content area means you can never use this to mark up content which has multiple control/detail areas which are opened or closed independently like tabs or accordion
[Bug 7746] <link rel=search> should be used instead of <input type=search> for backwards-compatibility and beacuse the search input type poses no additional input restrictions.
[Bug 7757] The "application cache update process" does not take a browsing context as argument. Do you mean the pass the active document as cache host? It should be more explicit about what is what.
[Bug 7759] The "application cache update process" does not take a single application cache as argument. It takes an application cache group. This means the "If document was loaded from an application cache" step is wrong.