Update polyfill.io to v3 in documentation

w3c / IntersectionObserver

Intersection Observer

https://www.w3.org/TR/intersection-observer/

Other

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Closed lol2x closed 5 years ago

lol2x commented 5 years ago

Polyfill.io v2 failed to load IntersectionObserver in Android 4.4 WebView

siusin commented 5 years ago

Marked as non substantive for IPR from ash-nazg.

lol2x commented 5 years ago

fixed in #378