Using HTML data-attribute to set CSS background-image url

Question

You will eventually be able to use

background-image: attr(data-image-src url);

but that is not implemented anywhere yet to my knowledge. In the above, url is an optional "type-or-unit" parameter to attr(). See https://drafts.csswg.org/css-values/#attr-notation.

If you wanted to keep it with just HTML and CSS you can use CSS Variables. Keep in mind, css variables aren't supported in IE.

<div class="thumb" style="--background: url('images/img.jpg')"></div> 

.thumb {
    background-image: var(--background);
}

Codepen: https://codepen.io/bruce13/pen/bJdoZW

It is not best practise to mix up content with style, but a solution could be

<div class="thumb" style="background-image: url('images/img.jpg')"></div>

You will need a little JavaScript for that:

var list = document.getElementsByClassName('thumb');

for (var i = 0; i < list.length; i++) {
  var src = list[i].getAttribute('data-image-src');
  list[i].style.backgroundImage="url('" + src + "')";
}

Wrap that in <script> tags at the bottom just before the </body> tag or wrap in a function that you call once the page loaded.