@interface WKFullscreenStackView : UIStackView {
    struct RetainPtr<AVBackgroundView> { void *m_ptr; } _backgroundView;
}

- (id)init;
- (id).cxx_construct;
- (void).cxx_destruct;
- (void)layoutSubviews;
- (void)addArrangedSubview:(id)a0 applyingMaterialStyle:(long long)a1 tintEffectStyle:(long long)a2;

@end