Are your WordPress custom fields showing as code on your website as Raw HTML instead of rendered HTML? This may be because you have updated WordPress and are using a deprecated function like the_meta(); This function no longer works in the same way in newer versions...
CSS only click events are not something that generally have a use in everyday web development because you have access to Javascript. But for standalone uses like emails or offline modes you may find this useful. If you already use the general sibling selector and know...