Over at jQuery14 the full list of progress, changes and improvements, notably (amongst other things) in the .css and .attr methods, as well as new AJAXian improvements. Also, event multi-binding is now (finally) available!

For a while now, you’ve been able to pass a function into .attr() and the return value of that function is set into the appropriate attribute. This functionalilty has now been extended into all setter methods: .css(), .attr(), .val(), .html(), .text(), .append(), .prepend(), .before(), .after(), .replaceWith(), .wrap(), .wrapInner(), .offset(), .addClass(), .removeClass(), and .toggleClass().

Addtionally, for the following options, the current value of the item is passed into the function as the second argument: .css(), .attr(), .val(), .html(), .text(), .append(), .prepend(), .offset(), .addClass(), .removeClass(), and .toggleClass().

This enables code like:

// find all ampersands in A's and wrap with a span
$('a').html(function(i,html){
  return html.replace(/&amp;/gi,'<span>&amp;</span>');
});

// Add some information to the title of the anchors
$('a[target]').attr("title", function(i,title){
  return title + " (Opens in External Window)";
});

Watch out for backward compatibility in some cases, and possible unexpected turns…