effect4 smoke by @garghy64 - Codewith.it

#main, .loader-cont { display: none; } JavaScript disabilitato.
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classDefinisce una o più classi per elemento
widthImposta la larghezza di un elemento HTML
<div>Crea contenitori generici o sezioni in una pagina
<!doctype>Dichiara la versione del linguaggio di sviluppo della pagina

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STILI + IMMAGINI

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“esercitazione4.html”

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<html>
<head>
<title>Canvas</title>
<script type="text/javascript">
// When the window has loaded, DOM is ready. Run the draw() function.

</script>
</head>
<body>
  <canvas id="myCanvas" ></canvas>
</body>
</html>

#myCanvas{
    background:black;
  width:100%;
  height:100%;
  position:fixed;
  top:0;
  left:0;
}

var particles = [];
var particleCount = 30;
var maxVelocity = 2;
var targetFPS = 33;
var canvasWidth = 400;
var canvasHeight = 400;
var imageObj = new Image();
imageObj.onload = function() {
  particles.forEach(function(particle) {
    particle.setImage(imageObj);
  }
                   );
};
imageObj.src = "http://www.blog.jonnycornwell.com/wp-content/uploads/2012/07/Smoke10.png";
function Particle(context) {
  this.x = 0;
  this.y = 0;
  this.xVelocity = 0;
  this.yVelocity = 0;
  this.radius = 5;
  this.context = context;
  this.draw = function() {
    if(this.image){
      this.context.drawImage(this.image, this.x-128, this.y-128);
      return;
    }
    this.context.beginPath();
    this.context.arc(this.x, this.y, this.radius, 0, 2 * Math.PI, false);
    this.context.fillStyle = "rgba(255, 255, 44, 1)";
    this.context.fill();
    this.context.closePath();
  };
  this.update = function() {
    this.x += this.xVelocity;
    this.y += this.yVelocity;
    if (this.x >= canvasWidth) {
      this.xVelocity = -this.xVelocity;
      this.x = canvasWidth;
    }
    else if (this.x <= 0) {
      this.xVelocity = -this.xVelocity;
      this.x = 0;
    }
    if (this.y >= canvasHeight) {
      this.yVelocity = -this.yVelocity;
      this.y = canvasHeight;
    }
    else if (this.y <= 0) {
      this.yVelocity = -this.yVelocity;
      this.y = 0;
    }
  };
  this.setPosition = function(x, y) {
    this.x = x;
    this.y = y;
  };
  this.setVelocity = function(x, y) {
    this.xVelocity = x;
    this.yVelocity = y;
  };
  this.setImage = function(image){
    this.image = image;
  }
}
function generateRandom(min, max){
  return Math.random() * (max - min) + min;
}
var context;
function init() {
  var canvas = document.getElementById('myCanvas');
  if (canvas.getContext) {
    context = canvas.getContext('2d');
    for(var i=0; i < particleCount; ++i){
      var particle = new Particle(context);
      particle.setPosition(generateRandom(0, canvasWidth), generateRandom(0, canvasHeight));
      particle.setVelocity(generateRandom(-maxVelocity, maxVelocity), generateRandom(-maxVelocity, maxVelocity));
      particles.push(particle);
    }
  }
  else {
    alert("Please use a modern browser");
  }
}
function draw() {
  context.fillStyle = "rgba(255, 255, 255, 0.5)";
  context.fillRect(0, 0, 400, 400);
  particles.forEach(function(particle) {
    particle.draw();
  }
                   );
}
function update() {
  particles.forEach(function(particle) {
    particle.update();
  }
                   );
}
init();
if (context) {
  setInterval(function() {
    update();
    draw();
  }
              , 1000 / targetFPS);
}