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accordions-dropdowns

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Use when animating accordions, collapsibles, dropdowns, or expand/collapse elements for smooth reveal transitions

skills/07-by-ui-element/accordions-dropdowns/SKILL.md

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# Accordion & Dropdown Animation Principles

Apply Disney's 12 principles to expand/collapse elements for smooth, informative reveals.

## Principles Applied to Accordions

### 1. Squash & Stretch
Content can slightly compress as it collapses, stretch as it expands. Trigger header can squash on click feedback.

### 2. Anticipation
Before expanding, header briefly depresses. Chevron starts rotation before content reveals. Builds expectation.

### 3. Staging
Expanded section should be clearly visible. Consider dimming other accordion items. Active header stays highlighted.