in-viewport-3.js

_setInitialState: on('init', function() {
  setProperties(this, {
    $viewportCachedEl   : undefined,
    viewportUseRAF      : canUseRAF(),
    viewportEntered     : false,
    viewportSpy         : false,
    viewportRefreshRate : 100,
    viewportTolerance   : {
      top    : 0,
      left   : 0,
      bottom : 0,
      right  : 0
    },
  });
}),