Sometimes it’s useful to perform an action on more than one item on the page at the same time - like when hiding or showing a series of elements all at the same time. With jQuery selector syntax, this is very easy. First, if you’re not familiar with basic CSS or jQuery selectors, you should probably start there. Once you’re familiar with that basic syntax however, you’ll be happy to know you can combine selectors with a comma (using the ‘multiple selector’ syntax), like this:

$("#itemone, #itemtwo").hide();
$("#itemthree, #itemfour").show();