Sometimes a a web developer wants to center align an advertisement to make it fit the page style or to act as a page break etc.
<div align="center">insert code here</div>
Align is supported across the board for all major browsers.
The style in HTML 5 prefers to use CSS rather than direct HTML capability. For some reason this does not work with WordPress with the theme we are using which is why we present the older align code.
We have spend a log of time using WordPress and when provide solutions to common problems so others do not have to read a ton of books to figure it out.