If you have a number of related images (or other content) with caption text, you can use nested figure elements to associate both a group caption and an individual caption to each instance using the figcaption element.
Using nested figure elements is a useful method for grouping related content instances, such as images.
Examples are provided on a separate page: Use of nested figures
Recommended methods – grouped images
Examples of recommended methods for marking up groups of images which have associated captions:
How NOT TO markup groups of images with associated captions
The HTML5 specification does not currently provide an example of using nested figure elements to mark up a group of images and their captions. Instead it promotes the use of the title attribute anti-pattern to caption the individual images within a figure.
An example of how not to mark up groups of images which have associated captions is provided in Example 3 – bad code example