I was trying to find out what class to use if I want a vector of garbage-collected objects in an off-heap class. There is no documentation I could find that tells me what to do. HeapVector and PersistentHeapVector have no comments in the class. https://chromium.googlesource.com/chromium/src/+/master/third_party/WebKit/Source/platform/heap/BlinkGCAPIReference.md conveniently has a section for it -- that's been left empty.

I eventually found out that https://sites.google.com/a/chromium.org/dev/blink/blink-gc used to have documentation, so I used its revision history to find it, so now I know to use PersistentHeapVector<Member<T>>. But I wish that documentation wasn't only found in a deleted page...