The answer
width (for the fill), transition (for smooth animation), border-radius (for rounded corners), overflow: hidden (on the container, to clip the fill), and background (gradient for a nice look).
How to Build a Progress Bar in an Interview
What CSS properties are important for a progress bar?
More FAQs in How to Build a Progress Bar in an Interview
Create a container div with an inner fill div. Set the fill's width based on a percentage. Use CSS transition for smooth animation. Add buttons to change the progress. Clamp the value to 0-100. Display the percentage.
Use CSS transition on the width property: transition: width 0.3s ease. When you change the width via JavaScript (bar.style.width = progress + '%'), the CSS transition animates the change smoothly.
Clamp the value to 0-100 (no negative or over 100), smooth animation with CSS transition, auto-increment mode (setInterval), and different colors for different ranges (red for low, green for high).
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