Core (container, fill, CSS transition, clamp 0-100, percentage display), advanced (auto-increment, color-based, circular, stripes, buttons), accessibility (role, aria-valuenow, aria-label), CSS (gradient, border-radius, transition, responsive), and testing (0%, 50%, 100%, clamping, smooth animation).
A container div, a fill div whose width is set by JavaScript, CSS transition for smooth animation, clamping to 0-100, and a percentage display. These are the minimum required features.
Auto-increment (setInterval), color based on progress (red/yellow/green), circular progress bar (SVG), striped animation for indeterminate, and buttons to increase/decrease/reset. These show depth.
Container: background gray, border-radius, overflow hidden. Fill: background color or gradient, transition: width 0.3s ease. Optional: border-radius on fill, box-shadow for glow, striped pattern for indeterminate.
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