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DOM.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<button id="btn" onclick="check1()">check1</button>
<button class="btn" onclick="check2()">check2</button>
<button class="btn" onclick="check3()">check3</button>
<button class="btn" onclick="check4()">check4</button>
<button class="btn" onclick="check5()">check5</button>
<button id="btn" onclick="check6()">check6</button>
<script>
// by Id (Single element not show array)
const i =document.getElementById("btn");
console.log(i);
// by class Name (Array)
const j=document.getElementsByClassName("btn");
console.log(j);
// by Tag Name
const z= document.getElementsByTagName("button")
console.log(z);
// by queryselector (Single class)
const u=document.querySelector(".btn")
console.log(u);
const o=document.querySelector("#btn")
console.log(o);
// by queryselectorAll (All array show (all classes show))
const v=document.querySelectorAll(".btn")
console.log(v);
</script>
</body>
</html>