font-weight: 1000;
According to the CSS spec:
"values greater than or equal to 1 and less than or equal to 1000 are valid" source
However, this is not yet fully supported in Firefox or Safari.
The left column (red) uses font-weight: 1000;
.
The right column (blue) uses font-variation-settings: 'wght' 1000;
.
The middle column should perfectly overlap (it will look purple if it does). If it doesn't, font-weight: 1000;
doesn't work.
font-weight
values above 900 is ignored and falls back to 900.font-weight
values up to 999
work, but font-weight: 1000;
is marked as invalid and weight falls back to
400
). However, in the latest Safari Tech Preview (Release 95 (Safari 13.1, WebKit 14609.1.7), this test works as intended.
Tested with Recursive Sans & Mono by Arrow Type.