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Today, they are mostly history, as querySelector is more powerful and shorter to write.… querySelector CSS-selector ✔ - querySelectorAll CSS-selector ✔ - getElementById id - - getElementsByName… getElementsByTagName tag or '*' ✔ ✔ getElementsByClassName class ✔ ✔ By far the most used are querySelector

Encapsulation.Shadow DOM is strongly delimited from the main document: Shadow DOM elements are not visible to querySelector… : Have their own ids space, Invisible to JavaScript selectors from the main document, such as querySelector

We can’t use it in querySelector.

navigation like nextElementSibling, children and searching methods like getElementsByTagName, querySelector