electron-api-demos
                                
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                        Display nothing inside window?
Win 7, win2008 Node.js is on your system? 8.11.2 v1.3.0 release electron-api-demos-windows.zip run OK, but nothing display inside window (main menus OK) when I run : npm start for source.
? maybe thers are not the font like font-family: 'BlinkMacSystemFont', 'Lucida Grande', 'Segoe UI', Ubuntu, Cantarell, sans-serif;

I wonder if adding another font to that list means that it would choose that instead of the others? Definitely want to work on this
Given that nothing is being rendered, I wonder if this is a hardware acceleration issue.
@okwh when running from source are you able to add app.disableHardwareAcceleration() just after this line and see if that changes the behaviour?
https://github.com/electron/electron-api-demos/blob/3a978054c38cfba89f09525a23a74f282280e6e0/main.js#L10
I wonder if adding another font to that list means that it would choose that instead of the others?
sans-serif as the fallback font is one that all browsers should recognise. I don't believe this is related to fonts.