Weekly github digest (HTML specs)

Issues
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* w3c/html (+2/-3/💬13)
  2 issues created:
  - <dialog> element should send focus back to the element that opened when it is closed (by Dan503)
    https://github.com/w3c/html/issues/1515 
  - <dialog> element should trap focus (by Dan503)
    https://github.com/w3c/html/issues/1514 

  8 issues received 13 new comments:
  - #1514 <dialog> element should trap focus (4 by Dan503, stevefaulkner)
    https://github.com/w3c/html/issues/1514 
  - #240 Should the special handling of <isindex> be removed? (2 by Azvareth, chaals)
    https://github.com/w3c/html/issues/240 
  - #860 4.11.7. dialog element - There is no HTML markup to distinguish open as a modal or non-modal (2 by Dan503, dance-cmdr)
    https://github.com/w3c/html/issues/860 [Feature request] [needs tests] 
  - #1508 Add <inputgroup> element (1 by desandro)
    https://github.com/w3c/html/issues/1508 
  - #1495 CSS for popout sidebar is broken (1 by scottaohara)
    https://github.com/w3c/html/issues/1495 
  - #980 'Media element' should be a category (1 by scottaohara)
    https://github.com/w3c/html/issues/980 [editorial] 
  - #1429 Need clarification on <audio> element support for <track> elements (1 by LJWatson)
    https://github.com/w3c/html/issues/1429 [a11y] [help wanted] 
  - #1431 Why is there no alt attribute associated with the poster attribute on a video element (or, what's the accessible name calculation on a video element)? (1 by mraccess77)
    https://github.com/w3c/html/issues/1431 [Feature request] [Needs incubation] [a11y] 

  3 issues closed:
  - 4.11.7. dialog element - There is no HTML markup to distinguish open as a modal or non-modal https://github.com/w3c/html/issues/860 [Feature request] [needs tests] 
  - fix "Contexts in which this element can be used:" of <figcaption> element https://github.com/w3c/html/issues/1509 [editorial] 
  - <dialog> element should trap focus https://github.com/w3c/html/issues/1514 



Pull requests
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* w3c/html (+2/-2/💬1)
  2 pull requests submitted:
  - Editorial: add GET & POST descriptions (by scottaohara)
    https://github.com/w3c/html/pull/1513 [editorial] 
  - Editorial: update figcaption usage context (by scottaohara)
    https://github.com/w3c/html/pull/1512 [editorial] 

  1 pull requests received 1 new comments:
  - #1512 Editorial: update figcaption usage context (1 by scottaohara)
    https://github.com/w3c/html/pull/1512 [editorial] 

  2 pull requests merged:
  - Editorial: update figcaption usage context
    https://github.com/w3c/html/pull/1512 [editorial] 
  - update bikeshed config
    https://github.com/w3c/html/pull/1511 


Repositories tracked by this digest:
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* https://github.com/w3c/html
* https://github.com/w3c/html-aam
* https://github.com/w3c/html-aria
* https://github.com/w3c/html-extensions
* https://github.com/w3c/html-landscape
* https://github.com/w3c/html-reference
* https://github.com/w3c/aria-in-html