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Many ways:
Javascript: document.querySelectorAll('#maindiv button')
JQuery: $('#maindiv button')
var buttons = document.querySelectorAll('#maindiv button')
console.log(buttons.length)<div id='maindiv'> <button></button> <button></button> <button></button> <button></button> <button></button> </div>2
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solved Count the number of buttons present inside a div