Why does my progress bar not animate in JavaScript?
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.
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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 are not clearing the interval. Add: if (progress >= 100) clearInterval(interval). Without this, the interval keeps running, wasting resources and potentially causing bugs.
Because the container does not have overflow: hidden. Add overflow: hidden and border-radius to the container. This clips the progress bar to the container's boundaries.
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