What is this tag for and is it really that important?

Robert,

Your HTML code wasn't showing up correctly. I fixed it in your post.

For the future, to put HTML/CSS/JavaScript in a forum post:

1. hit return to create a new line and type three back tick characters ```

2. hit return to create another new line and paste your HTML

3. hit return and add three more back tick characters: ``` The back tick character isn't the same as the single quote -- ' -- mark; the back tick is located on the same key as the ~ on most keyboards.

Also to add correct color highlighting add the name of the language after the back ticks like this: ```CSS. Here's what CSS should look like in a forum post:

#gallery li {
  float: left;
  width: 45%;
}