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Vic Mercier3,276 Points
Here's a basic example
<img src="" id="myImg" />
document.getElementById("myImg").src = "http://www.google.com/image.png"; document.getElementById("myImg").alt = "This is some alt text";
You can also use attribute selectors in jquery or querySelector/querySelectorAll in vanilla js - see here.
Hope this helps :)
Hope that helps! Happy coding!