Displaying Loading Image using CSS

Question

.my-img-container {
  position: relative;
  &:before {
    display: block;
    content: " ";
    background: url("https://lorempixel.com/300/160/") no-repeat;
    background-size: 100% 100%;
    width: 100% !important;
    padding-top: 56.25%;
  }
  >img {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100% !important;
    height: 100% !important;
  }
}

<div class="my-img-container">
  <img srcset="https://lorempixel.com/540/304 540w, https://lorempixel.com/960/540 960w" sizes="(min-width: 500px) 540px, 100vw" src="https://lorempixel.com/300/160">
</div>

I'm attempting to have a picture display in the background as the responsive image loads, hence the CSS content, however it's not working. Do you have any clue why?

Answer 1

You can set the spinner as a background to the image:

html,
body {
  height: 100%;
  margin: 0;
}

img {
  display: block;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 100%;
  background: url(https://upload.wikimedia.org/wikipedia/commons/b/b1/Loading_icon.gif ) no-repeat center;
}

<img srcset="https://picsum.photos/540/304 540w, https://picsum.photos/960/540 960w" sizes="(min-width: 576px) 540px, 100vw" src="https://picsum.photos/300/160">