OpenType Font Features

OpenType Font Features


FontWeights Class

Definition (Microsoft)

A font weight describes the relative weight of a font, in terms of the lightness or heaviness of the strokes. Weight differences are generally differentiated by an increased stroke or thickness that is associated with a given character in a font, as compared to a „normal“ character from that same font.

The FontWeights values correspond to the usWeightClass definition in the OpenType specification. The usWeightClass represents an integer value between 1 and 999. Lower values indicate lighter weights; higher values indicate heavier weights.

Font weight

usWeightClass

Thin

100

ExtraLight | UltraLight

200

Light

300

Normal | Regular

400

Medium

500

DemiBold | SemiBold

600

Bold

700

ExtraBold | UltraBold

800

Black | Heavy

900

ExtraBlack | UltraBlack

950

For more information about the OpenType usWeightClass value, see the
„Font File Tables“ section of the OpenType specification.

Source: TYPOGRAPHY.COM

OpenType Cookbook

OpenType Cookbook

This cookbook is written with the assumption that you have a basic working knowledge of the structure of a font. You need to know the differences between characters and glyphs, understand the coordinate system in glyphs and so on. If you aren’t familiar with that, go study the basics and then come back. This will all make a lot more sense that way.

Link

 

Further readings

OpenType specification
Using OpenType features
Syntax for OpenType features in CSS
The State of Web Type
What’s OpenType?
Which feature works in which program?
OpenType feature support in applications
OpenType Feature Intro

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