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    Demo

    The following options, shown with their default values, are available for both $.fn.smoothScroll and $.smoothScroll:

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      offset: 0,
     
      // one of 'top' or 'left'
      direction: 'top',
  1.  
      // only use if you want to override default behavior
      scrollTarget: null,
     
        // fn(opts) function to be called before scrolling occurs.
        // `this` is the element(s) being scrolled
        beforeScroll: function() {},
       
        // fn(opts) function to be called after scrolling occurs.
        // `this` is the triggering element
        afterScroll: function() {},
        easing: 'swing',
        speed: 400,
       
        // coefficient for "auto" speed
    1.   autoCoefficent: 2,
       
        // $.fn.smoothScroll only: whether to prevent the default click action
        preventDefault: true
       
      }
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      {

      The options object for $.fn.smoothScroll can take two additional properties: exclude and excludeWithin. The value for both of these is an array of selectors, DOM elements or jQuery objects. Default value for both is an empty array.

      The following option, in addition to those listed for $.fn.smoothScroll above, is available for $.smoothScroll:

      {
        // jQuery set of elements you wish to scroll.
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        //  if null (default), $('html, body').firstScrollable() is used.
          scrollElement: null,
        }

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