I have a very simple html file that displays a new image every 2 seconds. I am pretty sure my code works, I can open the file in a browser and everything is as expected. However, when I put it in an content editor webpart it fails to work properly. I currently have the code in a different file that the content editor references, I'm not really sure where I'm going wrong as I am very new to SharePoint. My code is below:

<meta name="viewport" content="width=device-width, initial-scale=1">
* {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}

<div class="slideshow-container">

<div class="mySlides fade">
  <div class="numbertext">1 / 3</div>
  <img src="image1.jpg" style="width:100%">
  <div class="text">Caption Text</div>

<div class="mySlides fade">
  <div class="numbertext">2 / 3</div>
  <img src="image2.jpg" style="width:100%">
  <div class="text">Caption Two</div>

<div class="mySlides fade">
  <div class="numbertext">3 / 3</div>
  <img src="image3.jpg" style="width:100%">
  <div class="text">Caption Three</div>


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

<script type="text/javascript">
var slideIndex = 0;

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";  
  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


Instead of displaying my images every two seconds, SharePoint will flash through them all and remain stuck on the third one. I should also note that this is SharePoint classic, all done online. I do not have access to SharePoint designer.

1 Answer 1


One of the annoying things I've found over the years with the Content Editor Web Part is that if you paste your content into the part then it can be manipulated in ways that you can't control.

The best approach I have found is to save your content into a separate file and upload it into a document library somewhere (I usually save as a .txt file) and from there, configure the CEWP to point to that file instead.

In your case, you might want to take the html, head and body tags out of your file and just have html content that can be slotted nicely into the rest of the page structure.

Hope that makes sense.

  • 1
    I removed my tags and saved everything as a text file, it works properly now! This thing has been plaguing me for such a long time, I cant thank you enough!! Commented May 26, 2021 at 14:08
  • You're welcome!
    – Paul Lucas
    Commented May 27, 2021 at 5:53

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