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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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1
Tests/LibWeb/Text/expected/IntersectionObserver/implicit-root-after-originating-iframe-is-removed-from-dom.txt Normal file
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@ -0,0 +1 @@
PASS if we didn't crash!

17
Tests/LibWeb/Text/input/IntersectionObserver/implicit-root-after-originating-iframe-is-removed-from-dom.html Normal file
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@ -0,0 +1,17 @@
<body>
<iframe></iframe>
<script src="../include.js"></script>
<script>
asyncTest(done => {
let iframe = document.querySelector("iframe");
iframe.src =
"data:text/html," +
encodeURI("<script>new IntersectionObserver(function() { }, { })<" + "/script>");
iframe.onload = function () {
iframe.remove();
done();
println("PASS if we didn't crash!");
};
});
</script>
</body>

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