Use CSS to access style custom attribute - html

Question

I don't know if this is possible or not, but any help would be very appreciated.
I have this code in my HTML:
<img src="mountains.jpeg" class="green inline-image" data-caption="A picture of mountains!">
where data-caption is a custom attribute.
I want to do something like this.
As you can see, the data-caption has to be in a small box right under the image, with the exact width as the image. I don't know if this is possible or not, so can you recommend an alternative way if not?
I tried doing something like this:
<img src="mountains.jpeg" class="green inline-image">
<div class="photo-caption">
A picture of mountains!
</div>
CSS:
.inline-image {
width:30%;
}
.photo-caption {
width:30%;
background-color:blue;
}
This works, but I'd prefer to not have to make a new <div> for every caption. I'd rather have it in the <img> tag.
Thank you very much!

Answer 1

Yeah it's possible using css content but problem in your case is you are using it on an img element which won't work on some browsers.
A different approach I would suggest is to insert your img element inside a div and have that custom attribute in there.
html:
<div class="img-block" data-caption="A picture of mountains!">
<img src="mountains.jpeg" class="green inline-image" >
</div>
css
.img-block:after {
content: attr(data-caption);
}
Reference