Why is a foldable transition more than a window resize?
A foldable transition changes the relationship between available space, device posture, input reach and the user’s current task, so treating it as a single breakpoint loses important product state.
- Map posture changes to product states, not device marketing names.
- Preserve navigation, selection, playback and draft state through reconfiguration.
- TODO: Validate the official iPhone Duo posture and lifecycle APIs when documentation is available.
Which interface assumptions should a team audit first?
Teams should audit fixed aspect ratios, full-screen overlays, edge-anchored controls and flows that assume one uninterrupted surface before adapting visual polish.
- Inventory absolute positioning and hard-coded canvas dimensions.
- Check modal, keyboard, drag and media behavior at every supported size.
- Identify content that can move between primary and supporting roles.
What evidence should guide a foldable layout?
A foldable layout should be guided by task continuity, reachability, safe regions and measured rendering behavior rather than by adding columns whenever more width appears.
- Test representative tasks across every transition path.
- Measure layout shift, frame time, memory and input continuity.
- TODO: Add verified iPhone Duo dimensions, safe areas and transition timings.