LibWeb: HTML navigables

[awesomekling]

Some time ago, the HTML spec saw a huge rewrite of its navigation and session history infrastructure.

There's a new concept called navigables which takes over many of the responsibilities previously held by browsing contexts.

LibWeb currently implements the "old style" browsing contexts, and we'll need to refactor it to use navigables instead.

Navigables: https://html.spec.whatwg.org/multipage/document-sequences.html#navigables

The HTML spec PR where everything changed: whatwg/html#6315

I started working towards it once before, but the branch is quite outdated by now. Nevertheless, it may provide some inspiration: https://github.com/awesomekling/serenity/tree/navigable

[nico]

Is this done after #18219 and friends?

[kalenikaliaksandr]

I think it is ok to close this issue. There are some bugs left but we have separate issues for them.