dom: Implement minimal IntersectionObserver workflow (#35551)

* Add very rough implemnentation of observation steps

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Fix entry reflection and propagate can_gc

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Fix BorrowError and add fragment find descendant

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Implement is descendant in containing block path correctly

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Fix unrooted error and tidy issues

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Fix comments

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Remove is descendant of other node query

I suppose these changes is better separated to other PRs.

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Fix intersection and refactor registration

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Use AppUnit more and propagate GlobalScope better

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Update WPT expectations

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Revert delay changes

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Align compute intersection algo to other browser actual behavior

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Align processing documents and note several issues

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Update WPT

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Minor lint

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Fix top level browsing context

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Make Registration rootable

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Avoid reflow inside observation step algo

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Using borrow for iterating registration

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Fix document disconnect

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Update WPT

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Address comments and minor quality suggestions

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Root the observer before nofifying any of it

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Tidy docs

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Account not found element and refactor observation step

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Fix documentations

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Ignore position of document viewport

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Refactor root intersection rectangle

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Add can GC note to the callback

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Fix top-level browsing context term

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

* Fix minor comments

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

---------

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

components/script/dom/domrectreadonly.rs

@@ -55,6 +55,20 @@ impl DOMRectReadOnly {
         )
     }
 
+    pub(crate) fn new_from_dictionary(
+        global: &GlobalScope,
+        proto: Option<HandleObject>,
+        dictionary: &DOMRectInit,
+        can_gc: CanGc,
+    ) -> DomRoot<DOMRectReadOnly> {
+        reflect_dom_object_with_proto(
+            Box::new(create_a_domrectreadonly_from_the_dictionary(dictionary)),
+            global,
+            proto,
+            can_gc,
+        )
+    }
+
     pub(crate) fn set_x(&self, value: f64) {
         self.x.set(value);
     }