why "id" is the best way to find the element in selenium webdriver? not xpath? -


why id best way find element in selenium webdriver? not xpath?

under hood it's doing javascript page search. document.getelementbyid() constant time lookup (o(1)) because there can 1 element per id on page. see answer more in-depth discussion. while on browsers it's not hash map lookup it's still faster xpath (see answer).

see perf test https://jsperf.com/getelementbyid-vs-queryselector/4 comparision.


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