The view is recalculated/re-rendered/repainted. The DOM is the single-threaded-access data structure that the rendering engine ties into. Part of the browser A

The view is recalculated/re-rendered/repainted. The DOM is the single-threaded-access data structure that the rendering engine ties into. Part of the browser API is querying all current CSS properties of an element, e.g., getComputedStyle(…). The only way to get this is by having the layout engine do all its work, so properties like height and width can return accurate info. Most virtual DOM implementations just skip parts of the API like this. At best, they make an educated guess without hitting the actual renderer. Or they just allow a pass through to getComputedStyle(…) and warn you away from using it due to performance concerns. It's all smoke and mirrors topped above a bed of lies.