Board Thread:Support Requests - Getting Technical/@comment-30398052-20170323165142/@comment-168424-20170323193618

Okay, that makes sense.

Unfortunately, due to the way images are rendered on most wikis, I don't think it's possible to have it fit-to-width.

I think the way it works is this: you tell the wiki how wide (or tall) you want the image and it creates a different scaled version and shows that. For a fit-to-width function it could generate literally thousands of images, if it had to generate a scaled version every time you resized the window or based on how the default window size shows up.

You could use Special:Contact/general and ask Fandom staff, if they could add this feature to the list of things they're working on. It's not impossible, since I think the mobile skin does something like this. However, people can't really change their window size (in theory) easily on mobile.