Dom/exercise1.html at main · farahmango/Dom · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Exercise #1: Changing text</title>
    <style>
        #mydiv {
            width: 300px;
            height: 50px;
            line-height: 50px;  /* for vertical alignment of text */
            text-align: center;
            border: 1px solid black;
            background-color: yellow;
            font-size: 2em;
            font-weight: bold;
        }
    </style>
</head>
<body>
<div id="mydiv" >Hello world</div>

<script>
// my div is an object  and obj have method
var mydiv =document.getElementById("mydiv");
// call functions
// onmouseover is a event for mydiv obj
mydiv.onmouseover = function () {
    mouseOver();
  };
  mydiv.onmouseout = function () {
    mouseOut();
  };
//   declare functions
  function mouseOver() {
    //   innerhtml method to change html elem  content
    mydiv.innerHTML = "Can I help you?";
  }

  function mouseOut() {
   mydiv.innerHTML = "Hello world!";
  }


</script>
</body>
</html>