Safer prefetch polyfill

This release replaces the very slim JS preload polyfill with a slightly larger one. This ensures that bundlers don't cause accidental overloading of unused variants by moving around the order of font-face declaration stylesheets.

Also fixed problem with subfont exiting if it encountered a page with no actively used font variants.

3.4.0

• Add support for custom CSS properties (#23)
• Better handling of the font shorthand

Local font subsetting

Breaking changes:

• Removed --format option. Subfont now automatically generates woff2 and woff files
• Switched font-display default value from auto to swap
• Renamed --inline-subsets option to --inline-fonts

Features:

• Added --[no-]recursive option (@papandreou)
• Added ability to subset locally with fonttools. Allows working with non-google fonts #3 #1
• Warn when glyphs are missing in original font #13
• Preload fonts with Javascript for browsers without preload support #5
• Output both woff2 and woff formats #4

Patches:

• Don't break when encountering existing preload hints for fonts

Inline CSS and inject font-display

• [minor] Added --inline-css option
• [minor] Added --font-display option
• [patch] Fixed missing preload hint attributes