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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Verified Answer
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