ES6 is old, there are many features that are common use introduced later than that. Refer to documentation that is updated, like the MDN documentation, there should always be written if browsers are compatible with the methods
I am Sorry What do you mean By your last line, there should always be written if browsers are compatible with the methods
Re browsers being compatible, a simplification: if the browser was made before 2015, then that’s before those features were added, so they won’t work. This is not a huge issue any more (most modern browsers automatically update), but more features get added to the language every year, so care has to be taken when using them.
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