Move to first 'default' focus of web page

Say you have website, and when you refresh it, if you check which element has focus, using this code:

setInterval(function () {
    console.log('ID: ', $(document.activeElement).attr('id') + ' Tag: ' + $(document.activeElement).prop('tagName')
        + ' C: ' + $(document.activeElement).attr('class'));
}, 2000);

You will see that tag of element is 'BODY' element. How do you restore focus to the same element using javascript because, things like $('body').focus(); doesn't work.

EDIT: It should also reset the 'focus' flow of document. So after you click TAB it will focus the same element as if you would refresh page then click TAB.

from Move to first 'default' focus of web page