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How do you build custom widgets using jQuery?

Senior JQuery
Quick Answer Custom widgets: wrap complex UI (date range picker, color wheel, rich text editor) in a self-contained plugin. Manage all state internally with .data(), expose a clean API (init, set, destroy), generate all required HTML in the plugin (don't require users to write specific markup), handle keyboard events for accessibility, and provide events for external integration.

Answer

Combine DOM manipulation, events, and animations.
Wrap logic in a plugin or module.
Use .data() for state.
Examples: sliders, tabs, accordions, modals.
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