You're right. This was a few years ago, so well after 2010. And yes, I'd say credit as well for the layout code, not blame. I wasn't knocking the code - for

You're right. This was a few years ago, so well after 2010. And yes, I'd say credit as well for the layout code, not blame. I wasn't knocking the code - for that era sparse arrays + DOM stuff were pretty common approaches and there didn't exist better web tooling than that. It's only been the last few years I'd say where the optimization quality (on the engine side) and API support has been good enough to justify this sort of approach ofjust plumbing your own graphics pipeline on top of the web. That was a spidermonkey issue. I treat that experience more as a lesson in how obscure corner cases left as perf cliffs never stay obscure corner cases, and always get exercised, and you can't afford to ignore them for too long.