<!DOCTYPE html>
<html>
<body>
<div id="myDiv">
This is some text. This is some text. This is some text.
This is some text. This is some text. This is some text.
This is some text. This is some text. This is some text.
This is some text. This is some text. This is some text.
</div><br>
<button type="button" onclick="myFunction()">Indent text</button>
<script>
function myFunction() {
document.getElementById("myDiv").style.textIndent = "50px";
}
</script>
</body>
</html>