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LibWeb: Implement IntersectionObserver "intersection roots" per spec

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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/
This commit is contained in:
Andreas Kling
2024-02-23 20:50:19 +01:00
parent 8586897928
commit 8addfc14af
3 changed files with 27 additions and 3 deletions
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12
Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserver.cpp
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@@ -11,6 +11,7 @@
#include <LibWeb/HTML/TraversableNavigable.h>
#include <LibWeb/HTML/Window.h>
#include <LibWeb/IntersectionObserver/IntersectionObserver.h>
#include <LibWeb/Page/Page.h>
namespace Web::IntersectionObserver {
@@ -156,11 +157,16 @@ Variant<JS::Handle<DOM::Element>, JS::Handle<DOM::Document>, Empty> Intersection
return m_root.value();
}
// https://www.w3.org/TR/intersection-observer/#intersectionobserver-intersection-root
Variant<JS::Handle<DOM::Element>, JS::Handle<DOM::Document>> IntersectionObserver::intersection_root() const
{
if (!m_root.has_value())
return JS::make_handle(global_object().navigable()->traversable_navigable()->active_document());
return m_root.value();
// The intersection root for an IntersectionObserver is the value of its root attribute
// if the attribute is non-null;
if (m_root.has_value())
return m_root.value();
// otherwise, it is the top-level browsing context’s document node, referred to as the implicit root.
return JS::make_handle(global_object().page().top_level_browsing_context().active_document());
}
// https://www.w3.org/TR/intersection-observer/#intersectionobserver-root-intersection-rectangle