Gecko implements two proprietary pseudo-classes on images and sometimes
<embed> / <object>. These are documented here:
* https://developer.mozilla.org/en-US/docs/Web/CSS/:-moz-loading
* https://developer.mozilla.org/en-US/docs/Web/CSS/:-moz-broken
While these seem somewhat useful in some cases[1], they were added for
internal use and have various issues (in particular :-moz-loading is
totally under-tested, and :-moz-broken no longer really reflects whether
we create a replaced element for an image or not).
So over-all I think it's better to remove. Once there's a standard
proposal for something like this, we should implement that.
I've done some looking-up into how risky this is to remove and it
doesn't seem particularly risky. All usages of :-moz-loading I've seen
were used to hide loading images, mostly due to some icon we used to
display long ago (we no longer do).
For :-moz-broken, I plan to leave a pref for now
(layout.css.moz-broken.content.enabled), if only because we have one
internal usage.
Let me know if this looks concerning. We've removed similar
pseudo-classes in the past like :-moz-suppressed without issues.
This will happen in bug 1850342, if there are no objections.
Cheers,
-- Emilio
[1]: https://github.com/whatwg/html/issues/3631
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