[css-fonts-4] List additions since Level 3

[fantasai]

It would be nice to have a list of what's new since Level 3.

[xfq]

Do you mean something like:

• https://drafts.csswg.org/css-cascade-4/#additions-l3
• https://drafts.csswg.org/css-color-4/#changes-from-3
• https://drafts.csswg.org/css-contain-2/#l1-changes
• https://drafts.csswg.org/css-grid-2/#changes-2
• https://drafts.csswg.org/selectors-4/#changes-level-3
• https://drafts.csswg.org/mediaqueries-4/#changes-2012

[xfq]

If so, here is a brief summary (according to the current Table of Contents and the commit history):

• Added font-display descriptor for @font-face
• Added @font-feature-values rule
• Added font variation properties, including font-optical-sizing and font-variation-settings
• Added color font support
• Defined feature-value-name for font-variant-alternates
• Added new auto value for font-weight, font-style and font-stretch descriptors
• Added ui-serif, ui-sans-serif, ui-monospace, and ui-rounded generic font families
• Added font-size: xxx-large
• Added font metric override descriptors
• Added some motivation for generic font families
• Added font feature technology keywords opentype, aat, and graphite
• Added math value to font-size