Scale image to fit a bounding box

Question

Is there a css-only solution to scale an image into a bounding box (keeping aspect-ratio)? This works if the image is bigger than the container:

img {
  max-         


        

Answer 1

Here's a hackish solution I discovered:

#image {
    max-width: 10%;
    max-height: 10%;
    transform: scale(10);
}

This will enlarge the image tenfold, but restrict it to 10% of its final size - thus bounding it to the container.

Unlike the background-image solution, this will also work with elements.

Interactive example:

 function step(timestamp) {
     var container = document.getElementById('container');
     timestamp /= 1000;
     container.style.left   = (200 + 100 * Math.sin(timestamp * 1.0)) + 'px';
     container.style.top    = (200 + 100 * Math.sin(timestamp * 1.1)) + 'px';
     container.style.width  = (500 + 500 * Math.sin(timestamp * 1.2)) + 'px';
     container.style.height = (500 + 500 * Math.sin(timestamp * 1.3)) + 'px';
     window.requestAnimationFrame(step);
 }

 window.requestAnimationFrame(step);

 #container {
     outline: 1px solid black;
     position: relative;
     background-color: red;
 }
 #image {
     display: block;
     max-width: 10%;
     max-height: 10%;
     transform-origin: 0 0;
     transform: scale(10);
 }