Backport PR #18732 on branch v3.3.x (Add a ponyfill for ResizeObserver on older browsers.)#18921

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QuLogic merged 1 commit intomatplotlib:v3.3.xfrom

meeseeksmachine:auto-backport-of-pr-18732-on-v3.3.x

Nov 10, 2020

Commits on Nov 10, 2020

Backport PR #18732: Add a ponyfill for ResizeObserver on older browsers.

tacaswell
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meeseeksmachine
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