The context of the callback function is not right when you use replaceWith(function);

$("h3").replaceWith(function(i) {

console.log(this);

//'this' will be the next sibling or the parent

});

Because replaceWith(function) ends up delegating to

jQuery(next).before(value)

or

jQuery(parent).append(value)

Since the current element isn't passed in as an argument or

set as the context, there's presently no way to work with it in the callback. I tend to think that the current elem should be set as context, as well as passed in as an arg, to be consistent with .html(function), .text(function), etc.