v133 · css + js
Progress Sequence
Five sequential loading phases — Connecting, Authenticating, Fetching, Processing, Rendering — each driven by a CSS animation with animation-delay chaining. overallProgress reads the live 0–1 value from each phase animation to feed the master bar and phase indicators. No requestAnimationFrame math, no timer arithmetic.
Feature detection: checking...
Five-phase load — overallProgress drives the progress bars
idle
overall — derived from sum of overallProgress across 5 phase animations
Before: manual progress tracking
Each phase would need a
setTimeout or rAF loop reading Date.now(), subtracting a stored start time, and dividing by a hardcoded duration — and that has to be repeated per phase. The animation's true playback position was inaccessible.After: animation.overallProgress
Each CSS animation exports a live
overallProgress from 0 to 1 that already accounts for its delay, duration, and fill. Reading all five values and averaging gives an accurate overall percentage with no per-phase math./* Five phases, chained via animation-delay */
.phase-0 { animation: fill 1.8s ease-in 0.0s forwards; }
.phase-1 { animation: fill 2.2s linear 1.8s forwards; }
.phase-2 { animation: fill 1.5s ease-out 4.0s forwards; }
.phase-3 { animation: fill 2.5s linear 5.5s forwards; }
.phase-4 { animation: fill 1.0s ease-in 8.0s forwards; }
@keyframes fill { from { width: 0%; } to { width: 100%; } }
// Poll overallProgress via rAF
function tick() {
const overall = phases.reduce((sum, a) =>
sum + (a.animation?.overallProgress ?? 0), 0) / phases.length;
masterBar.style.width = (overall * 100).toFixed(1) + '%';
if (overall < 1) requestAnimationFrame(tick);
}