Which approach provides the best rendering performance for animating element properties?
Using transform and opacity for animations provides the best rendering performance because these properties: 1) Can be hardware-accelerated, allowing GPU processing, 2) Don't trigger layout (reflow) operations, 3) Only require composition, which is much cheaper than layout or paint operations, 4) Create a new composition layer, isolating the animated element. Properties like left, top, width, height, margin, or padding trigger layout recalculations, which are CPU-intensive and can cause jank in animations.