Active Asset
The Active Asset or owning asset in an embedded SVG is the asset that the media file has been downloaded from.
For example, if you download the SVG file from asset 14, then asset 14 is the active asset.
Note that when you add an SVG to a type, the active asset is still the asset that you opened the media file from - so the asset that uses the type will be the active asset.
Most of the embed codes work in a way that is relative to the active asset.