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await keywords are supported by a majority of up-to-date browsers. But of course, Internet Explorer does not support them. Since
await are keywords, we can't really use a polyfill to fix that. But if you want to target an old browser and you want to code with the
await keywords, you should use the Babel compiler.
In this playground, we run the code in a NodeJS 8+ environment. So
await are natively supported.