Any browsing context that doesn't have a parent browsing context is now
considered a top-level browsing context. This matches the HTML spec.
This means we no longer keep a pointer to the top-level context, since
we can simply walk the parent chain until we find the topmost ancestor.
We already have a base class for frame elements that we call
BrowsingContextContainer. This patch makes BrowsingContext::container()
actually return one of those.
This makes us match the spec names, and also solves a FIXME about having
a shared base for <frame> and <iframe>. (We already had the shared base,
but the pointer we had there wasn't tightly typed enough.)
At the moment, nested browsing contexts expect that there's always a
top-level browsing context at some higher level. That's okay, but let's
keep the top-level pointer in a WeakPtr to make it easier to catch
mistakes (as this turns UAF into a null dereference.)
Our "frame" concept very closely matches what the web specs call a
"browsing context", so let's rename it to that. :^)
The "main frame" becomes the "top-level browsing context",
and "sub-frames" are now "nested browsing contexts".
2021-05-30 12:39:53 +02:00
Renamed from Userland/Libraries/LibWeb/Page/Frame.h (Browse further)
