Choose the smallest truthful SVG mode

01 / OutputSeparate geometry from interaction payload

Here is the reassuring part: every mode shares one parsed document, one layout, one set of routes, one viewBox. Only the styling and metadata differ, so raising or lowering the mode never moves the drawing underneath. The raw SVG in the playground is the exact string Render View displays — not a reconstructed DOM snapshot.

With wire hooks enabled, every signal wire exposes its parser-resolved topology as data-net-id: named nets keep their author name and unnamed nets use deterministic $N identities. The compilation source map exposes the same value as SchematicWireSource.netId; relation-only UML connectors omit it. Every junction dot the router draws — where a branch leaves its net's copper, or where a wire crosses its own net — carries the schematic-junction class, so a host can style joins apart from terminals. A connection written with trunk still carries data-wire-trunk, so the decompiler can read it back. The root <svg> names the measured font stack, Arial, Helvetica, 'Liberation Sans', Arimo, sans-serif, as its default.

source:SC "coin cell" at (90, 130) #blue [type=battery]
switch:SW "slide" at (300, 130) #amber [type=spst]
load:LP "lamp" at (540, 130) #emerald [type=lamp]

SC.positive -> SW.in #blue [line]
SW.out -> LP.in #emerald [line]

full mode keeps diagram-local IDs and provides accessible port targets. It never injects scripts, external fonts, raster assets, data URLs, or foreignObject.

02 / BytesReuse canonical symbols

Identical components reference a single <symbol> definition, and orientation costs only an instance rotation on top of it. A family we never use adds exactly zero bytes to the diagram, which is why a large drawing of few distinct parts stays small.

inductor:LA "L" at (130, 120) #purple
inductor:LB "L" at (350, 120) #purple [orientation=down]
inductor:LC "L" at (580, 120) #purple [orientation=up]