Recipes / How-to

Short, task-focused patterns for common authoring needs. Each builds on the Concepts and Authoring material.

Parallax background

Give a slide depth by scrolling a background image slower than the foreground: keyframe the image's position (and optionally scale) across the slide's scroll_range so it drifts as the reader scrolls. See Animation for the keyframe model.

Incremental build-up

Reveal a diagram step by step with an image_sequence in incremental compositing mode: each frame adds to the composite rather than replacing it, so the diagram accumulates as the reader scrolls.

Filmstrip crossfade

Use an image_sequence in the default blend mode to crossfade through a series of images — a compact way to show a process or a before/after sweep driven entirely by scroll.

Bottom-up content

For content that reads naturally from the bottom up (timelines, call stacks), set reverse: true on the slide so the scrollbar thumb starts at the bottom and rises as the reader advances.

Note

More recipes will be added over time. For the full set of fields each pattern uses, see the Element schemas reference.