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querySelector returns the first element that match the provided CSS query. Use it on the full document:
let myElem = document.querySelector('#myElem');
Or use it on an element to get an element within the element:
let elem = document.querySelector('p'); let myElem = elem.querySelector('#myElem');
querySelector returns all the elements that match the provided selector:
let elems = document.querySelectorAll('p');
And here you can do the same and narrow your selection. Let’s select span elements that are in the first p element:
let firstP = document.querySelector('p'); let spanElems = firstP.querySelectorAll('span');
You can find more data on support for the query selector feature across the major browsers from caniuse.com.
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