css before
.parent-div {
position: relative;
width: 100px;
height: 100px;
background: #ffffff;
border: 1px solid #000000;
}
.div:before {
content: "";
width: 20px;
height: 20px;
background: blue;
position: absolute;
top: 45%;
left: 45%;
}before in javascript
<button onclick="fun_name()">Insert</button>
<script>
function fun_name()
{
var elem = document.getElementById("idDiv2");
elem.before("New Content");
var elem2 = document.getElementById("idDiv1");
alert(elem2.outerHTML);
}
</script>Copyright © 2021 Codeinu
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