Glyph
Every glyph
Type tester
drawn from parsed outlines
the browser's own renderer, same bytes
Checked against the browser
Waiting for the font…
The same file is loaded as a FontFace. Advances are compared with measureText, kerning with the width difference between kerned and unkerned pairs, and outlines by rasterising both at 340px and counting pixels where one is ink and the other is paper.