<!DOCTYPE html>
<html>
<head>
  <title>Platformer</title>
  <style>
    body {
      background-color: #008000;
    }
    #game {
      border: 3px solid #000000;
      width: 800px;
      height: 600px;
      margin: auto;
    }
    #player {
      position: absolute;
      width: 50px;
      height: 50px;
      background-color: #000000;
      left: 0;
      top: 0;
    }
    #platform {
      position: absolute;
      width: 500px;
      height: 30px;
      background-color: #cccccc;
      left: 0;
      top: 500px;
    }
  </style>
</head>
<body>
  <div id='game'>
    <div id='player'></div>
    <div id='platform'></div>
  </div>
  <script>
    document.onkeydown = move;
    var player = document.getElementById('player');
    var platform = document.getElementById('platform');
    var speed = 10;
    function move(e) {
      switch(e.keyCode) {
        case 37:
        //left key
        player.style.left = (player.offsetLeft - speed) + 'px';
        break;
        case 38:
        //up key
        player.style.top = (player.offsetTop - speed) + 'px';
        break;
        case 39:
        //right key
        player.style.left = (player.offsetLeft + speed) + 'px';
        break;
        case 40:
        //down key
        player.style.top = (player.offsetTop + speed) + 'px';
        break;
      }
      if (player.offsetTop + player.offsetHeight >= platform.offsetTop) {
        player.style.top = (platform.offsetTop - player.offsetHeight) + 'px';
      }
    }
  </script>
</body>
</html>
HTML Platform Game Code: Create Your Own Jumping Game

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