Chrome displays some websites at a very small scale relative to the screen resolution, as you can see in this pic:
(Alternatively: link)
The same thing happens for pictures loaded in the browser, but the effect is even bigger (the pics show a minuscule preview in the browser page.
I'm using Chrome Version 42.0.2311.90 m (64-bit) on Windows 8.1 Pro.
Other browsers don't have this issue. If I zoom in 500% the page text is more legible, but the page content is displayed in a small, fixed area in the tab (~15% page width). I had the same issues with Chromium builds, so I installed Chrome to get rid of that, which worked only for a while. I'm not aware if this has been going since I installed Chrome, because it only seems to happen on some sites.