Test — Scroll to Top
HTML Structure
Button element with id="scroll-top" presentPASS
aria-label="Scroll to top" for accessibilityPASS
CSS
Fixed position: bottom 24px, right 24pxPASS
Initial state: opacity 0, pointer-events nonePASS
.visible class: opacity 1, pointer-events autoPASS
Behavior
Scroll listener uses requestAnimationFrame throttlePASS
Visibility toggles at 200px scroll thresholdPASS
Click triggers smooth scroll to topPASS