I often use Chrome's Cmd+ and Cmd- (Ctrl+ and Ctrl- on Windows) to zoom in and out on a web page. However, the new zoom level affects every tab showing a page from the same domain. Sometimes this is handy, but other times it's a big problem. Right now, I want to zoom a page containing a video on one tab, while continuing to read text at a normal size in another tab. Is there any method for controlling zoom independently of other tabs? For now I'm stuck using another two browsers.
Google-chrome – Chrome: any way to zoom a single page, not all pages in domain
Just discovered that the issue linked by @Qtax in the comments above was marked "Wontfix" by the Chromium dev team a couple of years ago - they state that this behavior is by design, and they do not intent to provide per-page zoom. The extensions mentioned in other answers appear to be the only resolution for this issue.