Another example:
https://www.youtube.com/watch?v=IkskY9bL9Bk

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[mac triage] There's was a recent WebKit bug about chinese fonts -- https://bugs.webkit.org/show_bug.cgi?id=162889

In https://trac.webkit.org/changeset/206791 , the font mappings Safari uses in SettingsCocoa.mm changed from relying on the system fallback mechanism to an explicit mapping "because it's more robust"...

Maybe this is at play here.

These seem to be both cases with fallback from Roboto on Sierra. I'll try to update soon and take a look.

#2, the referenced webkit CL does not help in this cases, this is for a better definition of font-family: cursive; for Chinese.

Related with  issue 659916 ?

Probably yes, I didn't have time to take a closer look yet.

Unable to reproduce with Chrome 54.0.2840.98 on 10.12.1 - 

ainslie@, could you try running the following terminal commands, restart Chrome and see if the behavior persists?

$ atsutil databases -removeUser
$ atsutil databases -shutdown
$ atsutil databases -ping

Thanks for checking.

Oh - I don't see this on my own machine (10.11.6). 
The screenshots I attached are from twitter (#0).

(I know it's not a really good idea to post this 'me too', but I want to provide more info anyway)

Ok, I am having this problem again.

https://twitter.com/henrylim96/status/932933156574867456

macOS: 10.13
Chrome: since Canary Version 62.0.3202.94

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henry, your problem is  issue 786777 .