We normally do smooth scroll to an anchor on the same page.  But I found most the developers are looking for a solutions to perform smooth scroll to an anchor  from different page or loading new page.

Below script will help to perform smooth scroll on the same page:

// Select all links with hashes
 $('a[href*="#"]')
 // Remove links that don't actually link to anything
 .not('[href="#"]')
 .not('[href="#0"]')
 .click(function(event) {
 // On-page links
 if (
 location.pathname.replace(/^\//, '') == this.pathname.replace(/^\//, '')
 &&
 location.hostname == this.hostname
 ) {
 // Figure out element to scroll to
 var target = $(this.hash);
 target = target.length ? target : $('[name=' + this.hash.slice(1) + ']');
 // Does a scroll target exist?
 if (target.length) {
 // Only prevent default if animation is actually gonna happen
 event.preventDefault();
 $('html, body').animate({
 scrollTop: target.offset().top
 }, 1000, function() {
 // Callback after animation
 // Must change focus!
 var $target = $(target);
 $target.focus();
 if ($target.is(":focus")) { // Checking if the target was focused
 return false;
 } else {
 $target.attr('tabindex','-1'); // Adding tabindex for elements not focusable
 $target.focus(); // Set focus again
 };
 });
 }
 }
 });

Below piece of code will help to perform a smooth scroll from different pages.

$("html, body").animate({scrollTop:$(window.location.hash).offset().top - 200 }, 500);

Putting all together will perform smooth scroll on same and from different page with offset of 200px.

jQuery(document).ready(function($) {

$("html, body").animate({scrollTop:$(window.location.hash).offset().top - 200 }, 500);


// Select all links with hashes
$('a[href*="#"]')
  // Remove links that don't actually link to anything
  .not('[href="#"]')
  .not('[href="#0"]')
  .click(function(event) {
    // On-page links
    if (
      location.pathname.replace(/^\//, '') == this.pathname.replace(/^\//, '') 
      && 
      location.hostname == this.hostname
    ) {
      // Figure out element to scroll to
      var target = $(this.hash);
      target = target.length ? target : $('[name=' + this.hash.slice(1) + ']');
      // Does a scroll target exist?
      if (target.length) {
        // Only prevent default if animation is actually gonna happen
        event.preventDefault();
        $('html, body').animate({
          scrollTop: target.offset().top - 200
        }, 1000, function() {
          // Callback after animation
          // Must change focus!
          var $target = $(target);
          $target.focus();
          if ($target.is(":focus")) { // Checking if the target was focused
            return false;
          } else {
            $target.attr('tabindex','-1'); // Adding tabindex for elements not focusable
            $target.focus(); // Set focus again
          };
        });
      }
    }
  });


});

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