You have a webpage in which you have specified the background-image, background-position, background-attachment, and background-repeat sub-properties. In this case, when you use Windows Internet Explorer 9 to browse the webpage, you notice that the value of the background shorthand property (style.background) reflects these four sub-properties instead of returning an empty string.
This issue occurs in Quirks mode, in Strict mode, and in Internet Explorer 8 document mode.
The returned background shorthand property value is valid. This issue only affects code that depends on the presence of a non-empty style.background value to detect whether all background sub-properties are set.
This issue occurs when all background sub-properties are set except the background-color sub-property.
Security update information
To resolve this problem, install the most recent cumulative security update for Windows Internet Explorer. To do this, visit the following Microsoft website: