PopYg

// http://viljamis.com/blog/2013/prototyping-responsive-typography/?utm_source=Responsive+Design+Weekly&utm_campaign=76e7785581-Responsive_Design_Weekly_046&utm_medium=email

$browser-context: 16; // Default

@function em($pixels, $context: $browser-context) {
  @return #{$pixels/$context}em
}

PopYg

    var secTopSet = [
        [".js-scr-sec", 100, .5, 100],
        [".js-scr-sec2", 100, .5, 100]
    ];
    var scrInnerStep = [];

    function scrollEvent() {
        scrollSet();
        scrollMotion(0);
        $window.scroll(function () {