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              <div class="banner-item">
<!-- Using a 2:1 image because the cat picture is better :) -->
    <img src="http://placekitten.com/1000/500" />
  <p><a href="http://daverupert.com/2011/11/responsive-image-hierarchy/">From Dave Rupert's Responsive Image Hierarchy</a></p>
              .banner-item {
  overflow: hidden;
  min-height: 300px; /* 300px is arbitrary. */
.banner-item img {
  width: auto;

/* 600px / 37.500em is about the width "locked in" at */
@media screen and (max-width: 37.500em) {
  .banner-item img {
    width: auto;
    max-width: none;
    height: 300px;
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