Thomas and I (with help from a few others) have been working pretty solid for the last 10 days or so to get this banner ready, and wanted to get it out with plenty of time before 02/11. We realize there are a few cross-browser quirks and some of our code is messy, but it works, and any issues will be ironed out between now and February 11th. You can embed the code starting now without worry.
In the meanwhile, if anyone wants to submit pull requests to fix any issues they see, that'd be wonderful. We'll clean up the code and fix any outstanding issues in the meanwhile.
In case you missed it, this is a follow up to The Day We Fight Back campaign [1]. The site itself will also be updated on the day.
[1] https://news.ycombinator.com/item?id=7037532
Edit: If you work at a medium or large tech company and care about this issue, please take a moment to start a conversation internally about joining the day of action on the 11th. It can be adding the banner, or something else entirely. It's likely you'll find quite a bit of support amongst other employees. While we've reached out to the policy arms of some larger companies, we're pretty constrained on resources, and many of them are interested but hesitant. Engineers often have a lot of say in what actually happens; if you care, speak up.