JS: Animate ScrollTo Inpage Navigation

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// Animate ScrollTo InPage Navigation
$(function(){
  $("a.inpage").bind("click", function (event) {
    event.preventDefault();
    var target = $(this).attr("href");
    var headerHeight = $('body > header').height();
    $("html, body").stop().animate({
      scrollTop: $(target).offset().top - headerHeight
    }, 1200);
  });
});