Intent to ship: Make elements always unvisited.

[Emilio Cobos Álvarez]

Summary: Make HTML  elements not query the browser history. This 
is unnecessary work, and matches other browsers (kinda, see below in the 
"Other browsers" section).


The TLDR is that even though this is technically required per spec as of 
today, it's a fairly obscure feature where there's no interop, and it 
causes issues unnecessarily, and extra history queries for no good reason.


Long term we should probably aim for  to not be traversable (even 
if you force-show it).


Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1572246

Standard: https://drafts.csswg.org/selectors-4/#location (though note 
https://github.com/w3c/csswg-drafts/issues/3817).


Platform coverage: All

Preference: none

Devtools bug: N/A

Other browsers:

Behavior here is all over the place. We used to match the current spec 
text and WebKit, until 
http://trac.webkit.org/projects/webkit/changeset/244642 landed not long ago.


With this change, we'd match Edge and WebKit. Chrome is the only browser 
which doesn't consider  a :link to begin with, and you can't click 
on force-showed links.


We may want to aim for this behavior in the long run to simplify the 
code, since force-showing a  element doesn't seem useful over-all. 
That may or may not require changes in the HTML spec 
(https://html.spec.whatwg.org/#links).


 -- Emilio
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Intent to ship: font-size: xxx-large

[Emilio Cobos Álvarez]

Summary:

Expose the xxx-large value for the font-size property, as resolved in 
https://github.com/w3c/csswg-drafts/issues/3907.


This value was previously accessible only via `` 
in HTML.


Sending an intent on behalf of the patch author.

Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1553545

Standard: 
https://drafts.csswg.org/css-fonts-4/#valdef-font-size-absolute-size


Platform coverage: All

Preference: None

DevTools bug: N/A

Other browsers:

  Blink: Fixed on trunk 
(https://bugs.chromium.org/p/chromium/issues/detail?id=966249)

  WebKit: Proposed the feature, but hasn't implemented yet AFAIK.

web-platform-tests: They exist, and a new reftest is added. See the patch.

Secure contexts: Not restricted, as all the other CSS font-size keywords.

Is this feature enabled by default in sandboxed iframes? Yes

 -- Emilio
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