FYI: with some super basic benchmarking that repeats an HTML snippet 1–100000 times and times how long setting innerHTML takes, I can report that in Firefox, it

FYI: with some super basic benchmarking that repeats an HTML snippet 1–100000 times and times how long setting innerHTML takes, I can report that in Firefox, it’s a little faster to omit </p>, a little faster to omit trailing slashes on void elements, quoting attributes is probably a bit faster, and that the XML parser is much slower (mostly 2–4×). In Chromium, parser performance is way noisier, and I mostly can’t easily see a difference by numbers (without plotting), though it’s probably faster to omit </p>. As for the effects of using the XML parser, my benchmark crashes the tab (SIGILL) in Chromium and I don’t care enough to figure out why.