Zoomdeck zooming presentations in the browser

Focus-only decorations

Elements that appear only while their slide is focused, such as an opaque local canvas.

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[[rectangle: #paper x=0 y=0 width=20 height=11.25 fill_color="#1E293B" fill_opacity=1 stroke_width=0 focus_only=true]]

## Decorations visible only in focus

[This caption fades in with focus and out when the camera leaves]{#caption x=-9.35 y=0.6 width=19 focus_only=true color=TEAL}

Static text, math, images, listings, shapes and groups with focus_only=true fade in when their slide is focused and out when the camera leaves, including to a child. They are drawn behind the slide's ordinary content, still take part in layout and can anchor other elements.

The typical use is an opaque local canvas with its heading: while the slide is focused the parent's text cannot show through, and on return the panel disappears so the parent is not covered.

Focus-only elements cannot carry step, hide or play, and show/hide/transform directives cannot target them. Transparent zoom-only slides need no local canvas.