[1] CSS Fonts Module Level 3 ( ( 版)) http://dev.w3.org/csswg/css-fonts/#cssfontfacerule
[2] Re: [css3-fonts][cssom] CSSFontFeatureValuesRule vs. CSSKeyframesRule ( (John Daggett 著, 版)) http://lists.w3.org/Archives/Public/www-style/2013May/0724.html
[3] [css-fonts] About the breaking change to CSSFontFaceRule interface (Xidorn Quan著, ) https://lists.w3.org/Archives/Public/www-style/2016Aug/0000.html
[4] [css-fonts] About the breaking change to CSSFontFaceRule interface (Xidorn Quan著, ) https://lists.w3.org/Archives/Public/www-style/2016Aug/0000.html
[5] CSSFontFaceRule etc. exposed to Window (ericwilligers著, ) https://github.com/w3c/csswg-drafts/commit/144108785bd098d5b18d3866222254ae7b83696e