As of today (November 4, 2025), all code blocks on Stack Overflow have a “Copy” button. From [Results of the October 2025 Community Asks Sprint: copy button for code blocks, and more](https://meta.stackexchange.com/q/414573/196432) on Meta:

> As of today, users will be able to copy blocks of code directly from posts on Stack Overflow, by clicking the new Copy button in the top right corner of the code block.  
> [...]  
> We can also enable this feature on other tech sites that use code blocks, let us know here if this functionality would benefit other Stack Exchange communities.

I think this would be a useful feature for Code Review as well.

Questions on Code Review *must* contain (real, working) code, and the first step in crafting a review is often to run the posted code. Also answers do often quote parts of the posted code. A “Copy” button would make this easier and less error-prone.

(In a comment to [my answer](https://meta.stackexchange.com/a/414575/196432) on Meta it was suggested that we discuss this on Code Review Meta first and then, if there is sufficient support by this community, forward the feature request to a CM.)