LibWeb: Implement IntersectionObserver "intersection roots" per spec

In particular, get the implicit root correctly for intersection observers that don't have an explicit root specified. This makes it possible to load the Terminal app on https://puter.com/
Author: https://github.com/awesomekling Commit: 8addfc14af Pull-request: https://github.com/SerenityOS/serenity/pull/23328 Reviewed-by: https://github.com/tcl3
2025-08-20 09:21:55 +00:00 · 2024-02-23 20:50:19 +01:00 · 2024-02-23 20:50:19 +01:00 · 8addfc14af · 2024-07-17 06:51:40 +09:00
commit 8addfc14af
parent 8586897928
3 changed files with 27 additions and 3 deletions
--- a/Tests/LibWeb/Text/expected/IntersectionObserver/implicit-root-after-originating-iframe-is-removed-from-dom.txt
+++ b/Tests/LibWeb/Text/expected/IntersectionObserver/implicit-root-after-originating-iframe-is-removed-from-dom.txt
@ -0,0 +1 @@
+    PASS if we didn't crash!