<!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>
<H1 id="H1"></H1>
<input type="Button" id="Button1" onclick="checkLength()" value="Check Length">
<input type="Button" id="Button2" onclick="ReplaceText()" value="Replace Text">
<input type="Button" id="Button3" onclick="FetchText()" value="Fetch Text">
<input type="Button" id="Button4" onclick="TrimText()" value="Trim Text">

<script>
    function checkLength()
    {
        var myText = "Hello World";
        document.getElementById("H1").innerHTML="The length is " + myText.length;
    }
    function ReplaceText()
    {
        var myText = "Hello India";
        document.getElementById("H1").innerHTML=myText.replace("India","World");
    }
    function FetchText()
    {
        var myText = "Hello World Learn Easy";
        document.getElementById("H1").innerHTML=myText.substring(0,5);
    }
    function TrimText()
    {
        var myText = "  HELLO   WORLD  ";
        myText = myText.trim();
        myText = myText.toLowerCase();
        document.getElementById("H1").innerHTML=myText;
    }
</script>

</body>
</html>