A walkthrough of building a custom drag-and-drop system from scratch using JavaScript and CSS, without relying on native HTML5 DnD APIs. Covers the core mechanics: tracking mousedown/mousemove/mouseup events, using absolute CSS positioning to move elements, handling coordinate space conversion between document and container, restricting draggables to parent bounds, and detecting drop collisions with droptarget elements. Includes a small jQuery-based library with a simple init/event API, plus a list of suggested improvements like multitouch support, scroll-on-edge, and axis constraints.
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