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

Understanding the "Error: CSS: background: / is an incorrect operator" Issue

CSS provides a convenient shorthand property, background, to simplify the management of various background attributes. When using this property, it's important to follow its correct syntax. Deviations from this syntax can lead to validation errors.

Cause of the Error

In the provided HTML, the background property of an element includes a "/" character, which separates the background-position and background-size attributes. However, this is an incorrect operator according to CSS syntax.

Correct Syntax and Explanation

The correct syntax for the background property involving both background-position and background-size is:

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

Here's a breakdown of the values:

• url(...): Defines the image to be used as the background.
• 100% 0: Specifies the background-position, setting the image's horizontal and vertical positions.
• /: Separates the background-position from the background-size.
• 4%: Sets the background-size, indicating the width and height of the background image relative to the element's size.
• no-repeat: Prevents the image from repeating across the element.

Additional Notes

It's worth noting that background-size must be specified alongside background-position in the shorthand background property. You can, however, specify background-position without background-size, as in the following example:

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

Related Issue

For reference, a similar question has been discussed elsewhere: "Issues with background-position in background shorthand property."

The above is the detailed content of Why Does My CSS Background Property Throw an 'Incorrect Operator' Error?. For more information, please follow other related articles on the PHP Chinese website!