This might sound like a silly question.
If I use this CSS snippet for regular displays (Where box-bg.png
is 200px by 200px);
.box{
background:url('images/box-bg.png') no-repeat top left;
width:200px;
height:200px
}
and if I use a media query like this to target retina displays (With the @2x image being the high-res version);
@media (-webkit-min-device-pixel-ratio: 2),
(min-resolution: 192dpi) {
.box{background:url('images/[email protected]') no-repeat top left;}
}
Do I need to double the size of the .box
div to 400px by 400px to match the new high res background image?
Do I need to double the size of the .box div to 400px by 400px to match the new high res background image
No, but you do need to set the background-size
property to match the original dimensions:
@media (-webkit-min-device-pixel-ratio: 2),
(min-resolution: 192dpi) {
.box{
background:url('images/[email protected]') no-repeat top left;
background-size: 200px 200px;
}
}
EDIT
To add a little more to this answer, here is the retina detection query I tend to use:
@media
only screen and (-webkit-min-device-pixel-ratio: 2),
only screen and ( min--moz-device-pixel-ratio: 2),
only screen and ( -o-min-device-pixel-ratio: 2/1),
only screen and ( min-device-pixel-ratio: 2),
only screen and ( min-resolution: 192dpi),
only screen and ( min-resolution: 2dppx) {
}
NB. This min--moz-device-pixel-ratio:
is not a typo. It is a well documented bug in certain versions of Firefox and should be written like this in order to support older versions (prior to Firefox 16).
- Source
As @LiamNewmarch mentioned in the comments below, you can include the background-size
in your shorthand background
declaration like so:
.box{
background:url('images/[email protected]') no-repeat top left / 200px 200px;
}
However, I personally would not advise using the shorthand form as it is not supported in iOS <= 6 or Android making it unreliable in most situations.