How do you calculate stroke-dashoffset for a circular progress bar?
offset = circumference - (percent / 100) * circumference. Where circumference = 2 * Math.PI * radius. At 0%, offset = circumference (no fill). At 100%, offset = 0 (full fill).
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More FAQs in Progress Bar Types: Linear, Circular, and Stepped
Linear (horizontal bar with width %), circular (SVG ring with stroke-dashoffset), and stepped (discrete steps with active states). Also striped (animated stripes) for indeterminate progress.
Use two SVG circles. The background circle has a gray stroke. The progress circle has stroke-dasharray set to the circumference (2 * PI * radius) and stroke-dashoffset set to circumference - (percent/100 * circumference). Rotate -90 degrees.
Create step elements in a flex row. Toggle an 'active' class based on the current step: step.classList.toggle('active', index <= currentStep). Style .active with a different background color.
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