I was working on a project where I needed to select a single cell of a table and get the text out of it using jQuery. I went with a multiclass css selector, like so:
1: <td class="class1 class2">...</td>
Using jQuery, I used $(".class1.class2") which returned an array of objects... so far so good. The jQuery spec indicates that the css selector is supposed to return an array of elements. My read of that was that the array returned should contain objects which have the typical jQuery attributes / methods (.text, .html, .val, ...