How can I add figure caption to image?

[jimmysue]

I'd like to add descriptions to images, and the descriptions with different format to distinguish with normal paragraph. what is the best way?

Thanks!

[DotIN13]

I've been using a way originally from a stackoverflow answer, which is to use html as follows:

<img src=""></img>
<em>Desc</em>

Then use the following selector to style the description:

img+em {
  // your style
}