Inner border over images with CSS?

You can do this without having an extra element or pseudo element:

http://cssdeck.com/labs/t6nd0h9p

img {
  outline: 1px solid white;
  outline-offset: -4px;
}

IE9&10 do not support the outline-offset property, but otherwise support is good: http://caniuse.com/#search=outline

Alternate solution that doesn’t require knowing the dimensions of the image:

http://cssdeck.com/labs/aajakwnl

<div class="ie-container"><img src="http://placekitten.com/200/200" /></div>

div.ie-container {
  display: inline-block;
  position: relative;
}

div.ie-container:before {
  display: block;
  content: '';
  position: absolute;
  top: 4px;
  right: 4px;
  bottom: 4px;
  left: 4px;
  border: 1px solid white;
}

img {
  vertical-align: middle; /* optional */
}

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