<img Class="alignnone Size-full Wp-image-163 Al... -

: These are WordPress-specific CSS classes.

This piece of code is the "behind-the-scenes" machinery of a blog post or website. While a reader sees a beautiful photograph or an informative chart, the browser sees this instruction. <img class="alignnone size-full wp-image-163 al...

Because this code appears on thousands of different WordPress sites, "wp-image-163" could be anything depending on the site it lives on: : These are WordPress-specific CSS classes