Issues with "Background-Position" in "Background" Shorthand Property

Issues with background-position in background shorthand property

As stated in the documentation of the background property, background-size cannot be set alone and it should be used with background-position. Also inherit and initial aren't valid values for those properties.

Sample Image

CSS background shorthand property not working with background-size

The background shorthand requires that you also set background-position in order to set background-size. You can find the grammar for the background shorthand in the spec, but in a nutshell the syntax for the two properties is

<bg-position> [ / <bg-size> ]

which means "background-position, optionally followed by a forward slash then background-size" (the usual optional-whitespace rules apply)

If you do not need to change background-position to a different value, the initial value is 0 0 (zero on both axes):

background: url("img/background.jpg") 0 0 / cover no-repeat;

CSS Background Shorthand property not work?

Two problems you have to fixed:

You doesn't have the "" for the url.

You have to separately set the background-size:cover property.

Set it in the background will not work.

*Not sure if image/computer.png is a local image or an invalid image. If it is a local image, just replace the url back (I change the url to wikipedia icon for showing purpose)

*{
         padding: 0;
            margin: 0;
        }
        .container{
            width: 800px;
            height: 800px;
            margin: 0 auto;
            border: solid 2px;
            background: red url("https://upload.wikimedia.org/wikipedia/commons/thumb/8/80/Wikipedia-logo-v2.svg/2244px-Wikipedia-logo-v2.svg.png")  0 0 no-repeat fixed;
           
        }

<div class="container">
    
        </div>

Why does css background-size/position not work with shorthand background url?

You have to use background-image instead of the shorthand background property. Shorthand background resets background-size and background-position to their default values, which is why the first rule ends up not doing anything.

Moving the shared CSS last in the file would also make it work by having last say, although of course this is not a real solution.

CSS background shorthand, can't include size

From MDN:

The value may only be included immediately after ,
separated with the '/' character, like this: "center/80%".

To clarify: The solution is to write background: none center/contain no-repeat, instead of separating them with spaces.

Error: CSS: background: / is an incorrect operator

If we refer to the formal syntax:

Sample Image

The / is the separation between background-position and background-size (this one being optional) so the correct syntax is:

 background: url(...) 100% 0/4% no-repeat;

Where background-position:100% 0 and background-size:4%

Note that background-size should always be specified with background-position when using shorthand syntax. You cannot specify the size without position but you can specify position without size:

 background: url(...) 100% 0 no-repeat;

Relatad question: Issues with "background-position" in "background" shorthand property

background-size in shorthand background property (CSS3)

Your jsfiddle uses background-image instead of background
It seems to be a case of "not supported by this browser yet".

This works in Opera : http://jsfiddle.net/ZNsbU/5/

But it doesn't work in FF5 nor IE8. (yay for outdated browsers :D )

Code :

body {
  background:url(http://www.google.com/intl/en_com/images/srpr/logo3w.png) 400px 200px / 600px 400px no-repeat;
}

You could do it like this :

body {
    background:url(http://www.google.com/intl/en_com/images/srpr/logo3w.png) 400px 400px no-repeat;
    background-size:20px 20px
}

Which works in FF5 and Opera but not in IE8.

Issues with "Background-Position" in "Background" Shorthand Property