An @font-face rule can declare a range for font-weight, font-stretch and font-style: oblique. The face is used for every value inside its range, and the request sets the variable font's axes there, kept inside the range. A font with no descriptors covers the range of its own axes.
HIAH requested 100, drawn at 300 | HIAH requested 450, drawn at 450 | HIAH requested 900, drawn at 600 | HIAH no descriptor: the axis reaches 900 |
HIAH 200 is in the first range | HIAH 500 is in neither: the nearer lighter range, at its upper end | HIAH 800 is in the second range |
HIAH 75%, drawn at 90% | HIAH 100% | HIAH 105.5% | HIAH 125%, drawn at 110% |
HIAH normal: upright (0 is in the range) | HIAH oblique 5deg | HIAH italic is 14deg, drawn at 10deg | HIAH oblique 25deg, drawn at 10deg |