I've been a professional C, Perl, PHP and Python developer.
I'm an ex-sysadmin from the late 20th century.
These days I do more Javascript and CSS and whatnot, and promote UX and accessibility.
Other people have talked about accessibility, so I'm going to add something else to the mix: potentially confusing UI.
There's a constant desire burning in the back of the eyes of everyone who calls themselves a "designer", and it's the desire to make things look like they're made by Apple. In Carbon, it extends to adding fake window controls to the image. There's literally no reason for this apart from someone's sense of aesthetic trumping their consideration for the end-user.
At best, you'll get something that clashes with the UI on your user's display, since they're using Windows or Apple have changed their colourscheme again.
At worst, people will spend time clicking them to see if they afford functionality like copying or viewing as raw text.
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I made a post about why this is a bad idea a while ago (but after you wrote this one): dev.to/moopet/embedding-code-in-po...
Other people have talked about accessibility, so I'm going to add something else to the mix: potentially confusing UI.
There's a constant desire burning in the back of the eyes of everyone who calls themselves a "designer", and it's the desire to make things look like they're made by Apple. In Carbon, it extends to adding fake window controls to the image. There's literally no reason for this apart from someone's sense of aesthetic trumping their consideration for the end-user.
At best, you'll get something that clashes with the UI on your user's display, since they're using Windows or Apple have changed their colourscheme again.
At worst, people will spend time clicking them to see if they afford functionality like copying or viewing as raw text.