If you watch the source here : https://github.com/Victa/path-menu/blob/master/sass/app.scss https://github.com/Victa/path-menu/blob/master/sass/app.scss // Gen

If you watch the source here : https://github.com/Victa/path-menu/blob/master/sass/app.scss https://github.com/Victa/path-menu/blob/master/sass/app.scss // Generate keyframes // Sass interpolation doesn't work with keyframe. CF : https://github.com/nex3/sass/issues/46 https://github.com/nex3/sass/issues/46 // so I use a tricks ==> "appear-'#{$i}'" - And it doesn't work in Firefox. It's impossible to generate @-moz-Keyframes + interpolation with Sass yet. That's why the experiment works only in Webkit.