The font-family CSS descriptor allows authors to specify the font family for the font specified in an @font-face rule.

@font-face CSS CSS Descriptor CSS Fonts Reference

The src CSS descriptor of the @font-face rule specifies the resource containing font data. It is required for the @font-face rule to be valid.

@font-face CSS CSS Descriptor CSS Fonts NeedsMobileBrowserCompatibility Reference

The user-zoom CSS descriptor controls whether or not the user should be able to change the zoom factor of a document defined by @viewport.

CSS CSS Descriptor Graphics Layout NeedsBrowserCompatibility NeedsExample Reference Web

The zoom CSS Descriptor sets the initial zoom factor of a document defined by @viewport.

CSS CSS Descriptor Graphics Layout NeedsBrowserCompatibility NeedsExample Reference Web