js

<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="/lib/w3.css">
<style>
.mySlides {display:none;}
</style>
<body>

<div class="w3-content w3-section" style="max-width:500px">
  <img class="mySlides" src="img_la.jpg" style="width:100%">
  <img class="mySlides" src="img_ny.jpg" style="width:100%">
  <img class="mySlides" src="img_chicago.jpg" style="width:100%">
</div>

<script>
var myIndex = 0;
carousel();


function carousel() {
    var i;
    var x = document.getElementsByClassName("mySlides");
    var microtime = (Date.now() % 1000) / 1000; 

    for (i = 0; i < x.length; i++) {
       x[i].style.display = "none";  
    }
    myIndex++;
    if (myIndex > x.length) {myIndex = 1}    
    x[myIndex-1].style.display = "block";
    x[myIndex-1].src = x[myIndex-1].src + '?v=' + microtime;  

    setTimeout(carousel, 2000); // Change image every 2 seconds
}
</script>

</body>
</html>
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