Context:
https://chromium-review.googlesource.com/c/chromium/src/+/1363957/1/third_party/blink/renderer/core/display_lock/display_lock_context.cc#473

We're currently blocking style recalc from happening, but we're not blocking a number of other things such as style invalidation. Should we? Is it expensive?

It is probably worth investigating this. The risk is that blocking more of the stages while locked might introduce some bugs if some other part of the code relies on clean style invalidation bits and is not aware of display locking.