After anim is done it jumps back to 0

[Thomvl]

My css is more specific than the one you inject in the head, for me this little change fixes it ( setting auto to auto!important on the complete line)

styles.textContent = '[reveal] { -webkit-'+ au +'-moz-'+ au + au +'}' +
        '[reveal-transition="frame"] { -webkit-' + t + '-moz-' + t + t + 'height: auto; }' +
        '[reveal-transition="complete"] { height: auto!important; }' +
        '[reveal-transition]:not([reveal]) { -webkit-'+ ar +'-moz-'+ ar + ar +'}' +
        '@-webkit-' + r + '@-moz-' + r + r +
        '@-webkit-' + u + '@-moz-' + u + u;