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A comment on Using const/let instead of var can make JavaScript code run 10× slower in Webkit. Parent comment

Re:Using const/let instead of var can make JavaScript code r... by minitech on Wednesday October 21, 2020 @07:46AM (#24846838)
> how much slower querySelector is compared to old school getElementByid, getElementsByClassName

IE 8 got querySelector before IE 9 got getElementsByClassName, so it’s not really an old vs. new thing, and I don’t think anyone expects querySelector to be faster than getElementById.

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