This results in lots of new WPT test passes.
There were also a couple of WPT tests that turned out to be broken;
tab-size-inline-001 and -002 had errors in their reference files such
that they'd never pass anywhere. So those are fixed here.
Depends on D117331
Differential Revision: https://phabricator.services.mozilla.com/D117332
This parsing is hidden behind the pref layout.css.page-size.enabled.
It isn't ideal that we parse this as a property, but we can't treat it as a
descriptor because of compatibility issues with other browsers. There are also
outstanding spec issues related to how descriptors like page-size are cascaded,
and whether the !important specifier is valid or not.
Differential Revision: https://phabricator.services.mozilla.com/D103958
This is a gross hack, of course, but has the advantage of not breaking sites
that use both zoom and -moz-transform / -moz-transform-origin.
There should be no behavior change when the pref is off, of course, and the
webcompat team wanted to experiment with this.
Differential Revision: https://phabricator.services.mozilla.com/D49792
Also, update the serialization by the shorter perference because this is
a new feature and using older syntax doesn't make sense.
Besides, use `cssOffset` for web animation IDL attribute name.
Differential Revision: https://phabricator.services.mozilla.com/D45607
For developing properties, we will handle them in an other bug.
Besides, I use an iframe for the test because we create a use counter in
the constructor of Document, which use the prefs to decide what kind of
properties we want to record. So, in the test, we have to reload iframe
to make sure we re-create the document, so does the use counter, to make
sure the prefs work properly.
The two prefs affect the css use counters:
1. layout.css.use-counters.enabled: Allocate use counters, and record
non-custom properties.
2. layout.css.use-counters-unimplemented.enabled: Record all unimplmented
properties into the use counters.
If we disable layout.css.use-counters.enblaed, we don't create use counters
object, so layout.css.use-counters-unimplemented.enabled doesn't work,
either.
Differential Revision: https://phabricator.services.mozilla.com/D43860
