A range slider lets users select values by dragging thumbs along a track. The native <input type="range"> works but is ugly and single-thumb only. Custom implementations enable dual-thumb range selection, tick marks, and real-time tooltips.
Key points: Prevent thumb collision with Math.min(value, this.maxValue - this.step). Use percentage positioning for automatic responsiveness. Implement keyboard support (arrow keys) for role="slider" accessibility. Bind both touch and mouse events.
Common pitfalls: Don't mix pixel and percentage positioning (breaks on resize). Always align values to step with Math.round(value / step) * step. Set { passive: false } on touchmove to allow preventDefault.
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