What is an easing function in progress bar animation?
A function that changes the rate of animation over time. For example, easeOutCubic: 1 - Math.pow(1 - t, 3) starts fast and slows down. This makes the animation feel natural instead of linear (constant speed).
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More FAQs in Progress Bar Animation Techniques in JavaScript
The simplest way is CSS transition: transition: width 0.3s ease. When you change the width via JavaScript, the browser animates it. For full control, use requestAnimationFrame with a custom animation loop.
Track elapsed time with performance.now(). Calculate progress as elapsed/duration. Set width = from + (to - from) * progress. If progress < 1, call requestAnimationFrame(step) again. This gives smooth, frame-by-frame animation.
Use a linear-gradient background with diagonal stripes (45deg). Animate background-position with @keyframes to move the stripes. This creates an indeterminate progress effect (something is happening, no specific percentage).
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