Handing off W3C Advisory Committee duties

[L. David Baron]

For quite a while, I've been posting reviews of proposed W3C
charters and W3C Proposed Recommendations to this list, as part of
being Mozilla's representative to the W3C Advisory Committee, which
really means the person who expresses official Mozilla positions on
things to W3C, and designates Mozilla representatives to working
groups, who can then represent Mozilla in the discussions within
working groups.

I've just handed off the responsibility of being the Advisory
Committee Representative to Tantek Çelik, so in the future you
should expect to see those reviews coming from him rather than from
me.

(On a side note, it's also not clear to me that dev-platform is
really the best way to have those discussions today; it's possible
we should look for an alternative forum that lends itself a bit more
to discussion.)

-David

-- 
턞   L. David Baronhttps://dbaron.org/   턂
턢   Mozilla  https://www.mozilla.org/   턂
 Before I built a wall I'd ask to know
 What I was walling in or walling out,
 And to whom I was like to give offense.
   - Robert Frost, Mending Wall (1914)
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Intent to prototype: CSS aspect-ratio in [css-sizing-4]

[Boris Chiou]

*Summary*: This property sets a "preferred aspect ratio" for the box, which
will be used in the calculation of auto sizes and some other layout
functions. (Note: If a box has both a width and a height that are not
automatic, then the preferred aspect ratio has no effect.)
Example: A very simple case: if there is only a  with 'width: 100px'
and 'aspect-ratio: 1 / 1'. The automatic size of its height is 100px.

*Bug*: Bug 1528375 
*Standard*: https://drafts.csswg.org/css-sizing-4/#aspect-ratio
*Platform coverage*: All platforms
*Preference*: layout.css.aspect-ratio.enabled (This is default off on all
channels. Only enabled for testing)
*DevTools bug*: N/A

*Other browsers*:
 * Chromium issue 1045668
: Chromium
has merged the implementation of aspect-ratio for basic blocks cases, for
experimental testing
 * WebKit: not yet

*web-platform-tests*:
https://github.com/web-platform-tests/wpt/tree/master/css/css-sizing/aspect-ratio

-- Boris
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Intent to prototype: ::file-chooser-button

[Emilio Cobos Álvarez]

*Summary:* Add a pseudo-element to file inputs in order to expose the 
internal "Browse" button.


Since there's no spec yet, and the name might change, I plan to /not/ 
ship it just yet, and keep it Nightly / Dev Edition only for now until 
the dust settles.


*Bug:* bug 1635675 .

*Standard:* None yet, this was just resolved 
 by the CSS Working Group.


*Platform coverage:* All platforms.

*Preference:* layout.css.file-chooser-button.enabled

*Devtools Bug:* N/A

*Other Browsers:*

 * WebKit and Blink ship a prefixed version of this called
   ::-webkit-file-upload-button.
 * EdgeHTML shipped a prefixed version of this called ::-ms-browse.

*web-platform-tests:* I'm adding some very basic tentative tests in the 
patch.


*Secure contexts:* Not restricted to secure contexts as many other CSS 
selectors.


*Is this feature enabled by default in sandboxed iframes?* Yes

  -- Emilio

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