HTML and CSS Reference
In-Depth Information
To demonstrate the difference between standard and high-resolution background images, the file displays
two identical sets of links. Both use the same styles, but those intended for high-resolution display also use a class
called hires .
The hires class resets the background-size property of the sprite to the same size as the standard one. As
a result, the 80-pixel gap in the high-resolution sprite is halved to 40 pixels when the browser displays it. So, the
same background-position offsets apply to both sprites. Apart from the addition of the high-resolution media
query, the styles in sprites_hires.html are identical to sprites.html in the ch08 folder. The styles look like this:
.icons {
background-image: url('images/icons.png');
background-repeat: no-repeat;
.rss {
padding-left: 30px;
.phone {
padding-left: 25px;
background-position: left -40px;
a[href^='mailto:'] {
padding-left: 30px;
background-position: left -80px;
a[href$='.pdf'] {
padding-right: 24px;
background-position: right -120px;
a[href^="http://"] {
padding-right: 25px;
background-position: right -160px;
@media only screen and (min-resolution: 2dppx), screen and
(−webkit-min-device-pixel-ratio: 2) {
.icons.hires {
background-image: url(images/icons_large.png);
background-size: 35px 179px;
Figure 17-8 shows how the standard and high-resolution icons look on a retina display iPad. Because the
icons are small, the difference isn't immediately visible, but it's markedly noticeable when they're scaled up.
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