Svelte crossfade: Takes 2 elements, uses scaling and translate, and fades them through the
animation (both of them are always the same size)
Old m3-svelte container transform: Based on crossfade, but instead of scaling it uses clip-path
New m3-svelte container transform: Kinda based on crossfade, maintains a background element and
uses scaling, clip-path, and translate to transition the elements
Actual container transform: Fades the content through. Content is anchored at top center. The
content is scaled as needed to match the smaller sides and clipped. For example if
something that was already the full width was expanding, it would clip vertically. If it was
skinnier but tall enough, it would scale to match heights and clip horizontally. If it was a
FAB, it would scale to match widths and clip vertically.