Working on some CSS for a WordPress site, I came across this:

img[class*="attachment-"] {
    height: auto; /* Make sure images with WordPress-added height and width attributes are scaled correctly */

Are thes wild cards that will work for any instance of, for instance, class="wp-image-a", class="wp-image-b", class="attachment-vacation"?

Yes correct. The *= will select those elements that contain that substring.

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