UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36

Example URL:
https://oreillymedia.github.io/Using_SVG/ch18-interaction-files/gem-click-game-misses.svg

Steps to reproduce the problem:
1. Create a .svg file that uses CSS background (color or image) on the :root element, set with an external CSS stylesheet.
2. Open it in Chrome. If need be, refresh the tab. The behavior is really flaky, it seems to happen about half the time.
3. If you get a version where the background isn't being drawn, open Dev Tools. Confirm that the style is correctly being parsed. Try changing the background style.

What is the expected behavior?
The root element of an SVG file is drawn with CSS backgrounds and borders, whether the style is set inline, via external CSS, or via Dev Tools.

What went wrong?
Sometimes (it's flaky), the CSS background for the SVG canvas isn't drawn at all.  In that case, even changing the styles in Dev Tools does not seem to force a re-paint.

Does it occur on multiple sites: N/A

Is it a problem with a plugin? N/A 

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 60.0.3112.90  Channel: stable
OS Version: 10.0
Flash Version: 

Twitter poll confirms that it wasn't just me:
https://twitter.com/AmeliasBrain/status/895022662258262016

People are having problems on various OS (see comments), so it's not just a Windows thing, either.