Currently, the skins called Vector, Monobook & co. display a small button "Enlarge", on the top right of captions (ex: https://en.wiktionary.org/wiki/elephant?useskin=vector#Noun), which is not the case with Timeless (https://en.wiktionary.org/wiki/elephant?useskin=timeless#Noun)

As a result, the WP-en template "CSS_image_crop" which manually built the thumb's frame and the caption, displays the .magnify link as a raw link: https://en.wikipedia.org/wiki/Template:CSS_image_crop?useskin=timeless#Examples (scroll down to the second caption to see it), instead of displaying the traditional "Enlarge" button, as shown above with Vector.

Is it a bug, or a feature of Timeless?