Copywriting TODOs in markup

I have a real problem with accidentally letting placeholder copy get into production. I’ve done it on almost every project I’ve ever launched, and I really don’t want to screw it up on my current project. I started out by marking placeholder copy with TODO comments, but I’ve moved to a CSS solution:

<p class="placeholder">
  This thing lets you create an owner for your new account.
</p>

I have a style that makes these placeholders painfully obvious:

.placeholder {
  border: 3px solid lime;
  color: black;
  background-color: magenta;
}

I think a lot less stuff is going to slip through the cracks.