Without a doubt, the possibility to leverage CSS selectors in Google Tag Manager’s trigger conditions is one of the most useful features of the platform. It gives you an amazing amount of flexibility, especially when combined with GTM’s click and form triggers. Essentially, CSS selectors let you test an HTML Element against a selector string. This check verifies that the element matches the given selector. In practice, this would mean that when you use the click or form trigger, you can check if the Click Element or Form Element built-in variables match a specific selector, allowing you to confirm that the action happened on the correct element.