What is automatic slideshow in HTML

<!--automatic slidshow-->

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
* {box-sizing: border-box;}
body {font-family: Verdana, sans-serif;}
.mySlides {display: none;}
img {vertical-align: middle;}

/* Slideshow container */
.slideshow-container {
max-width: 1000px;
position: relative;
margin: auto;
}

/* Caption text */
.text {
color: #f2f2f2;
font-size: 15px;
padding: 8px 12px;
position: absolute;
bottom: 8px;
width: 100%;
text-align: center;
}

/* Number text (1/3 etc) */
.numbertext {
color: #f2f2f2;
font-size: 12px;
padding: 8px 12px;
position: absolute;
top: 0;
}

/* The dots/bullets/indicators */
.dot {
height: 15px;
width: 15px;
margin: 0 2px;
background-color: #bbb;
border-radius: 50%;
display: inline-block;
transition: background-color 0.6s ease;
}

.active {
background-color: #717171;
}

/* Fading animation */
.fade {
-webkit-animation-name: fade;
-webkit-animation-duration: 1.5s;
animation-name: fade;
animation-duration: 1.5s;
}

@-webkit-keyframes fade {
from {opacity: .4}
to {opacity: 1}
}

@keyframes fade {
from {opacity: .4}
to {opacity: 1}
}

/* On smaller screens, decrease text size */
@media only screen and (max-width: 300px) {
.text {font-size: 11px}
}
</style>
</head>
<body>

<h2>Automatic Slideshow</h2>
<p>Change image every 2 seconds:</p>

<div class="slideshow-container">

<div class="mySlides fade">
<div class="numbertext">1 / 3</div>
<img src="img_nature_wide.jpg" style="width:100%">
<div class="text">Caption Text</div>
</div>

<div class="mySlides fade">
<div class="numbertext">2 / 3</div>
<img src="img_snow_wide.jpg" style="width:100%">
<div class="text">Caption Two</div>
</div>

<div class="mySlides fade">
<div class="numbertext">3 / 3</div>
<img src="img_mountains_wide.jpg" style="width:100%">
<div class="text">Caption Three</div>
</div>

</div>
<br>

<div style="text-align:center">
<span class="dot"></span>
<span class="dot"></span>
<span class="dot"></span>
</div>

<script>
var slideIndex = 0;
showSlides();

function showSlides() {
var i;
var slides = document.getElementsByClassName("mySlides");
var dots = document.getElementsByClassName("dot");
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
slideIndex++;
if (slideIndex > slides.length) {slideIndex = 1}
for (i = 0; i < dots.length; i++) {
dots[i].className = dots[i].className.replace(" active", "");
}
slides[slideIndex-1].style.display = "block";
dots[slideIndex-1].className += " active";
setTimeout(showSlides, 2000); // Change image every 2 seconds
}
</script>

</body>
</html>
<html>
<head>
<style>
#slider {
width: 100%;
height: 100%;

margin: 0 auto;
border: 10px solid transparent;
padding: 0px;

z-index: 100;
overflow: hidden;
white-space: nowrap;
box-sizing: border-box;
}
#slider > li {
width: 100%;
height: 100%;

position: relative;
display: inline-block;
overflow: hidden;
font-size: 15px;
font-size: initial;
line-height: normal;
transition: all 0.5s cubic-bezier(0.4, 1.3, 0.65, 1); /* Slide css animation */
background-size: cover;
vertical-align: top;
box-sizing: border-box;
white-space: normal;
}
</style>
</head>
<body>
<ul id="slider">
<li>
<p>Some content.</p>
</li>
<li>
<p>Some more content.</p>
</li>
<li>
<p>And here's space for more.</p>
</li>
</ul>
<script>
// Slide every slideDelay seconds
const slideDelay = 3000;

const dynamicSlider = document.getElementById("slider");

var curSlide = 0;
window.setInterval(()=>{
curSlide++;
if (curSlide === dynamicSlider.childElementCount) {
curSlide = 0;
}

// Actual slide
dynamicSlider.firstElementChild.style.setProperty("margin-left", "-" + curSlide + "00%");
}, slideDelay);

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

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