This is absolutely not HTML related, but by sheer demand, I needed to add it somewhere. To add a "space" to the dock in OS X, open up Terminal.app and enter this. Enter it as many times as you want spaces. Error on too many, they are easy to remove.

defaults write com.apple.dock persistent-apps -array-add '{"tile-type"="spacer-tile";}'

They won't show up until you force restart the Dock with:

killall Dock

To remove them, just drag them up and out of the Dock like any other icon. To move them around, click and drag.