Is it true that all SVG Tiny content will work on an SVG Basic or SVG Full implementation?
Yes, because SVG Tiny is a strict subset of SVG Basic, which is in turn a strict subset of SVG Full, all conformant SVG Tiny, SVG Basic and SVG Full implementations will correctly display all SVG Tiny content; similarly all conformant SVG Basic and SVG Full implementations will correctly display all SVG Basic content.