Changelog

v0.1.5

Exit animations no longer fire during a live_redirect. When the whole page is about to be replaced, watching every animated element on the outgoing view collapse and fade is more jarring than calming. Mid-page interactions (clicks, form submits) still animate exits normally because their loading kind is "element", not "redirect".

Layout cache now seeds when an element transitions from hidden to visible. The v0.1.3 fix stopped caching a bogus (0, 0) for elements inside a display: none ancestor, but the cache stayed empty until the first DOM mutation while visible — and by that point the move had already happened, leaving FLIP without a pre-move position to animate from. An IntersectionObserver now watches every tracked element and seeds the cache the moment visibility changes.

Elements that mount inside a display: none ancestor no longer cache a bogus (0, 0) layout. The next time they appear and then change, FLIP would diff against the stale zero and fly the element in from the top-left of the page. measure now returns null when the element has no layout, and the cache stays empty until the element is actually visible.
Cross-parent moves where the element becomes the first child of its new parent now animate. The previous local-position FLIP gate saw localTop = 0 in both the old and new parent and skipped the animation entirely. Relayout now also FLIPs whenever the element's parent itself changes, using the body-relative delta for the transform amount.

Position FLIP is now gated by the element's position relative to its immediate parent, not its body-relative offset. Previously, any layout change that shrank content above a tracked list — a delete in one demo, for instance — would shift everything below it in body coordinates, and Shift would FLIP every unrelated element down the page back to its old absolute position. Now only elements whose position within their own parent changes get animated; the body- relative delta is still what the FLIP translates by, so bottom- anchored layouts (toast stacks) keep working.
Cached layouts now refresh on window resize. The MutationObserver doesn't fire on a resize, so previously every tracked element's __shiftLayout went stale and the next real layout change would FLIP against the pre-resize positions — animating the resize delta into whatever change came next. A debounced resize listener now remeasures every tracked element so the next FLIP starts from the current layout.

Sibling layout caches now refresh on every animation frame during a size-collapsing exit, and are nulled when the element is finally removed. Previously, the post-removal relayout would FLIP each neighbor by the full reflow distance, snapping them back to their pre-exit positions and animating up again.

Special-case collapse for <tr> exits. Because display: table-row derives its height from the tallest cell rather than its own CSS height, each cell's padding, font-size, and line-height are now animated to zero alongside the row's exit. The row's intrinsic height shrinks with the animation while the table layout stays intact.
fontSize and lineHeight added to PX_PROPS so the keyframe builder emits them with a px unit instead of as bare numbers (which WAAPI silently ignores).

Initial release.

<.animated> component — one component for enter, exit, layout (FLIP), and size animations.
Tween transitions with phase-aware easing defaults (ease-out on enter, ease-in-out on exit and layout).
Spring transitions backed by a numerical ODE solver — overshoot and damping behave physically.
Smart defaults: opacity fade by default, auto-resolved targets when only initial is given, padding/margin/border collapse on size animations.
Inferred mid-life animations — position and size changes animate automatically; opt out per element with disable: [:position, :size].
Server-driven exits via phx-remove, with cascading-order preservation and sliding-window stack handling out of the box.