Why is my progress bar animation jerky?
Because you are updating too frequently (e.g., every 1ms) or have no CSS transition. Update every 50-100ms and add transition: width 0.3s ease. The CSS transition smooths the animation between updates.
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More FAQs in Progress Bar Common Bugs and Fixes
Because you are not clamping the value. Fix: percent = Math.max(0, Math.min(100, percent)). This ensures the value never goes below 0 or above 100.
Because you do not have a CSS transition on the width property. Add: transition: width 0.3s ease to the progress bar's CSS. When you change the width via JavaScript, the browser animates it.
Because you are not clearing the interval. Add: if (progress >= 100) clearInterval(interval). Without this, the interval keeps running, wasting resources and potentially causing bugs.
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