= Variable Fonts =

//Myles Maxfield, Apple//

- contain tables for each glyph
	- sequence of points that define each path
- variable fonts allow parameterization of:
	- control points in glyph contours
	- advances (horizontal space) for each glyph
	- shaping information
	- '''basically all information specified by table'''
- parameters held in a vector
	- grouped together into axes
		- e.g. weight, height, etc.
- software sends a value to the font structure that generates a result based on these axes
- SanFransisco only understands `weight` axis
- Skia has `weight`, `width`, etc.
- these axes are animatable
- implemented/used via CSS
- three main components
	- some properties already exists (`weight`, `width`, and `stretch`) which map directly onto axes (`weight`, `width`, and `slant`)
	- remaining axes do not currently have CSS properties, but are used by the browser
	- axes that are unknown to browsers
		- `font-variation-settings` is a sequence of key-value pairs that define custom axes and their value format
			- due to cascading of CSS, this property must replace the entire list (no append)
- each property can have different syntax/format
- prevents duplication of fonts for different features
- new format will be larger than a single font, but smaller than two forms of the same font (normal and bold > new format > normal)
- support for font files with this format is basically done
- CSS implementation is still being worked out