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. 4. Straight Ahead & Pose to Pose Define cle…