$('h1,h2,h3,li,p').each(function() {
$(this).html($(this).html().replace(/\s([^\s<]+)\s*$/,' $1'));
});
///and for longer words that can be widows:
$('h1,h2,h3,li,p').each(function() {
$(this).html($(this).html().replace(/\s([^\s<]{0,10})\s*$/,' $1'));
});