LibWeb/Layout: Expose which pseudo-element a node was generated for

Author: https://github.com/AtkinsSJ
Commit: 23520509cc
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5132
Reviewed-by: https://github.com/tcl3

Libraries/LibWeb/Layout/Node.h

@@ -50,6 +50,7 @@ public:
     void reset_needs_layout_update() { m_needs_layout_update = false; }
 
     bool is_generated() const { return m_generated_for.has_value(); }
+    Optional<CSS::PseudoElement> generated_for_pseudo_element() const { return m_generated_for; }
     bool is_generated_for_before_pseudo_element() const { return m_generated_for == CSS::PseudoElement::Before; }
     bool is_generated_for_after_pseudo_element() const { return m_generated_for == CSS::PseudoElement::After; }
     bool is_generated_for_backdrop_pseudo_element() const { return m_generated_for == CSS::PseudoElement::Backdrop; }