Is there anyway to have a textarea “autofit” height based on the content at page load?

How about http://www.jacklmoore.com/autosize/ Drop Autosize into any web page and it should Just Work. The source is short and well commented if you are curious to how it works.

// Example:
$(document).ready(function(){
    $('textarea').autosize();   
});

Source: https://github.com/jackmoore/autosize

Demo: http://www.jacklmoore.com/autosize/