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LibWeb: Add initial implementation of IntersectionObserver

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The main missing features are rootMargin, proper nested browsing
context support and content clip/clip-path support.

This makes images appear on some sites, such as YouTube and
howstuffworks.com.
This commit is contained in:
Luke Wilde 2023-07-06 23:44:07 +01:00 • committed by Andreas Kling
parent 6f8afd8cd9
commit 165abafb80
16 changed files with 664 additions and 22 deletions
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3
Userland/Libraries/LibWeb/HTML/EventLoop/Task.h
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@ -38,6 +38,9 @@ public:
// https://w3c.github.io/FileAPI/#fileReadingTaskSource
FileReading,
// https://www.w3.org/TR/intersection-observer/#intersectionobserver-task-source
IntersectionObserver,
// Some elements, such as the HTMLMediaElement, must have a unique task source per instance.
// Keep this field last, to serve as the base value of all unique task sources.
UniqueTaskSourceStart,