I am essentially trying to create a version of the \"figure\" element (upcoming in HTML5), whereby I have an image with a short description below it.
However, I want
For setting the width to match the image automatically you could use
.figure {
display: table;
width: 1px;
}
This makes the div behave like a table (not supported in Internet Explorer). Or you could use a table instead of the div. I don't think there is another way of setting the width automatically.
Edit: The simplest way is to forget about the auto width and set it by hand. If it is really needed you can use JavaScript or a table. In this case the use of a table is not so ugly because you are addressing a limitation of the HTML version. In the case of server-side scripting you could also set the width when generating the page.