Summary: A .srcElement property on events that is an alias of .target.
It's originally an IE-ism that now everyone but us supports.
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=453968
Standard: https://dom.spec.whatwg.org/#dom-event-srcelement
Target release: Firefox 62
Preference: None. This is behind a nightly-only ifdef right now; I am
planning to remove the ifdef.
Concerns: The main worry here is whether sites use this for UA-detection
and would take "IE-only" codepaths if it's present. We have been
shipping this in nightly since it landed partway through the 60 cycle,
and haven't run into any issues so far...
-Boris
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