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LibWeb: Extract shared lazy-loading behavior into a base class
`<iframe>` and `<img>` tags share the same spec for several aspects of lazy-loading: how the `loading` attribute works, the "will lazy load element" steps, and a member for storing the lazy-load resumption steps. So let's share the implementation by using a base class. This mostly involves moving things around. However, we also change the `start_intersection_observing_a_lazy_loading_element()` method to take a LazyLoadingElement, and operate on one, instead of always casting to HTMLImageElement. We do unfortunately have to do some shenanigans to make the cast work, by adding a virtual function stub in DOM::Element.
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@ -105,6 +105,7 @@ public:
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virtual bool is_html_button_element() const { return false; }
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virtual bool is_html_slot_element() const { return false; }
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virtual bool is_navigable_container() const { return false; }
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virtual bool is_lazy_loading() const { return false; }
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WebIDL::ExceptionOr<JS::NonnullGCPtr<Node>> pre_insert(JS::NonnullGCPtr<Node>, JS::GCPtr<Node>);
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WebIDL::ExceptionOr<JS::NonnullGCPtr<Node>> pre_remove(JS::NonnullGCPtr<Node>);
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