http://24ways.org/2014/an-overview-of-svg-sprite-creation-techniques/
https://css-tricks.com/svg-sprites-use-better-icon-fonts/
https://css-tricks.com/icon-fonts-vs-svg/
http://24ways.org/2014/an-overview-of-svg-sprite-creation-techniques/
https://css-tricks.com/svg-sprites-use-better-icon-fonts/
https://css-tricks.com/icon-fonts-vs-svg/