I can confirm this bug.
View attachment 719468
2017 MacBook10,1 10.13 Safari 11.0 - Renders perfectly
2009 MacBookPro5,5 10.13 Safari 11.0 - Garbled like in your pic
2008 MacBook5,1 10.13 Safari 11.0 - Garbled like in your pic
2017 iMac18,3 10.12 Safari 10.1.2 - Renders perfectly
2008 MacBook4,1 10.7 Safari 6.1.6 - Doesn't display at all. Acts like your Chrome example with a static image.
It would be interesting to see the results from a MacBook6,1, since that is fully supported by High Sierra, but has the same
nVidia 9400M GPU. In fact, it's almost identical to the MacBook5,1 spec-wise.
In fact, I'm going to post a thread on this.
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Seems this page is borked in general. On my 2017 iMac18,3 Sierra with Safari 10.1.2, it renders correctly until I resize the page. Then I get this:
View attachment 719469