Why Does My CSS `background` Property Throw an 'Incorrect Operator' Error?

Fixing the Invalid Background Property: Resolving "Error: CSS: background: / is an Incorrect Operator"

The provided HTML snippet includes a "background" property that raises an "incorrect operator" error when validated. The issue lies in the presence of a "/" character, which requires clarification.

Understanding the Background Syntax

CSS defines the syntax for the "background" shorthand property as follows:

background: <bg-property> <bg-property> ... ;

Where "" can be any combination of the following:

• background-color
• background-image
• background-position
• background-size
• background-repeat
• background-attachment

Resolving the "Incorrect Operator" Error

In the provided HTML, the error occurs due to the following "background" property:

background: url('...') 100% 0 / 4%;

The "/" character is used as a separator between the "background-position" and "background-size" properties. However, the HTML validator detects that this usage is incorrect.

Correcting the Background Syntax

According to the CSS syntax, the correct way to separate "background-position" and "background-size" is by omitting the "/" character and instead using a space. Therefore, the valid "background" property should be:

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

Where 100% 0 represents "background-position" and 4% represents "background-size".

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