Re: web-platform-tests that fail only in Firefox (from wpt.fyi data)

Hi Philip, Do you know how do reftests run in order to get that data? I'm particularly curious about this Firefox-only failure: css/selectors/selection-image-001.html It passes both on our automation and locally. I'm curious because I was the author of that test (whoops) and the Firefox

Intent to Implement: selector() function for @supports / CSS.supports.

Summary: Fruit of procrastination, I plan to implement (but not ship) David's proposal for a selector() function in @supports. See https://github.com/w3c/csswg-drafts/issues/3207 for an explainer, discussion and context. Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1499386 No spec

Intent to Implement and Ship: window.screenLeft and window.screenTop aliases

(Trying to be more disciplined about pinging dev-platform@ about web-exposed changes, a few other emails will come up in a bit) Summary: I plan to add the screenLeft and screenTop properties to the window, as aliases of screenX and screenY respectively, mostly for compat with other engines.

Starting mozilla-build from WSL

This is a quick and dirty script I threw together which allows you to start a mozilla-build shell from within WSL. which allows me to do windows builds from a WSL bash ssh prompt on a remote windows machine. https://github.com/mystor/mbuild I'm mostly using this for my own stuff, and I certainly