> For the complete documentation index, see [llms.txt](https://docs.synaps.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.synaps.app/reference/properties.md).

# Properties

Shared appearance controls for supported shapes — stroke, fill, line style and opacity.

Select a shape to see the appearance controls it supports. These pages explain shared fill, stroke and line-style controls. Not every shape exposes every property: walls, rooms, openings and annotations may use dedicated controls instead.

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><strong>Stroke</strong></td><td>Colour, weight and opacity of a shape's outline.</td><td><a href="/reference/properties/stroke.md">Stroke</a></td></tr><tr><td><strong>Fill</strong></td><td>The colour inside a closed shape.</td><td><a href="/reference/properties/fill.md">Fill</a></td></tr><tr><td><strong>Line style</strong></td><td>Solid or dashed.</td><td><a href="/reference/properties/line-style.md">Line style</a></td></tr><tr><td><strong>Opacity</strong></td><td>How see-through a shape is.</td><td><a href="/reference/properties/opacity.md">Opacity</a></td></tr></tbody></table>