Question

Can anyone explain the meaning of the attribute complete?

I read somewhere that it might have to do with DOM.

<img src="/folder/pic.jpeg" complete="complete" /> 

Answer 1

It’s set when the image has been downloaded.

I’ve never seen it explicitly in the HTML like in your example (MDN says it’s not an attribute for a img element) . I just use to check if the image has been downloaded with JavaScript (there are cross browser issues with that, however). The property on a HTMLImageElement returns a Boolean.

[].forEach.call(document.querySelector("img"), function(img) {
    // Loaded?
    img.complete && (img.style.border = "5px solid #f00");
});