Y25Q1 Implementor Face-to-face Prep

[Westbrook]

In preparation for the upcoming face-to-face with implementors, let's gather for a little ad hoc hacking once a week through the month of January to ensure demos, WPTs, etc. are ready to present during the quarterly sessions.

Right now, looking at finding one good day of the week to meet at 11am ET throughout the month. Share which day works best for you in Discord.

If you've got ideas for things we can hack on in over the course, drop them in a comment below. Some ideas to start with:

• WPTs for "RESOLUTION: elementInternals.type='button' enables custom elements to get button-like semantics" is @jpzwarte is able to join one week.
• Reference Target usage via the current API to clarify whether we think it should be named differently
• Scoped Registry usage, looking to see if we can get an advanced copy of the WebKit proposal
• :has-slotted...how should it resolve a match!?
• more?