Looks like @CodePen does server-side UA sniffing and sends broken markup to non-Chrome browsers. https://bugzilla.mozilla.org/show_bug.cgi?id=1306384#c8 …
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@chriscoyier1 reply 0 retweets 0 likes -
I can chime in on that ticket. tl;dr that value was causing obnoxious console noise when it wasn’t supported
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I'm not aware of us having any console noise for this case (unlike sandbox CSP, which logs unknown tokens).
10:43 AM - 7 Oct 2016
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