Not as Serious as I Thought
After calming down from my initial panic of being responsible for a sudden mass-crashing of blogs everywhere (ha, how I flatter myself that my readership is that large), I went back and studied the critique on my code, and it seems I left out one </span> directly at the end of the code in Step 2 of my instructions. If you look now, you'll see that it's been added. Wait, I'm going to break my own rule of No Overexuberance with Multicolored Fonts and make this forgotten bit of code a bright hussy pink so nobody will miss it.
Sorry for all the mad flapping and the slip-up everybody.