Use dynamicDowncast<T> more in the DOM instead of is<T>() + downcast<T>(). It is less error-prone and often results in more concise code. I am also hoping to have downcast<>() do a type check on release builds in the future. It is currently too expensive to do so but it may become affordable if we use dynamicDowncast<T>() instead when possible.
Pull request: https://github.com/WebKit/WebKit/pull/20384
Committed 270617@main (b1c357dd6e0f): <https://commits.webkit.org/270617@main> Reviewed commits have been landed. Closing PR #20384 and removing active labels.
<rdar://problem/118305393>