title: Listen to HTML/CSS events of web page
body: <p>I'm looking for a way to listen for an event in the HTML/CSS of a webpage. Basically, a website I use at work lists queues and appointments, which flag as yellow/red based on the amount of time late on taking said appointment. Other than this visual aide, there is no alert of any kind, which is a failing point if one is juggling multiple windows and doesn't notice.</p>
  
  <p>What I would like to do is put together a simple way to watch for the tag ID or perhaps the flag hex color, and then alert me in a way of my choosing.</p>
  
  <p>The work environment is on OS X, so I presume I'm looking at an Objective-C centric solution unless Applescript is capable of doing this.</p>
  
  <p>Any help would be greatly appreciated.</p>