API reference / Common / Viewport

Interface: Viewport

What the engine should paint: a window into document space plus the output surface metrics. The canvas is pinned to the viewport (synthetic scroll), so scrollX/scrollY are a document-space offset, not DOM scroll.

Properties

Property	Description
scrollX number	Document-space offset of the top-left of the visible window.
scrollY number	-
zoom number	Faithful zoom; 1 == 100% (1 document pt → 96/72 CSS px).
dpr number	Device pixel ratio (CSS px → device px).
width number	Visible canvas size in CSS px.
height number	-