Just wanted to add to this page as it helped me a lot.
If you have (widows) actually should be orphans as widows are single words that land on the next page and not single words on a new line.
Working with postcodes like "N12 5GG" will result in the full postcode being on a new line together but still classed as an orphan so a work around is this. (changed the class to "noWidow2" so you can use both versions.
123 Some_road, Some_town, N12 5GG
$('.noWidows2').each(function(i,d){
var value=" "
$(d).html($(d).text().replace(/\s(?=[^\s]*$)/g, value).replace(/\s(?=[^\s]*$)/g, value));
});
This will result is the last 3 white spaces being on a new line together making the postcode issue work.
End Result
123 Some_road,
Some_town, N12 5GG
