CSS3 added support for multiple background images. Which declaration uses the correct syntax for applying two background images to the same element?

CSS3 added support for multiple background images. Which declaration uses the correct syntax for applying two background images to the same element?

• A. background: url("images/logo.png"), url("images/pattern.png");
• B. background-image: url("images/logo.png"), url("images/pattern.png")
• C. background-image: url("images/logo.png"); url("images/pattern.png");
• D. background-image: url("images/logo.png"), url("images/pattern.png");

Answer: (D)

Multiple background images are applied by listing the image URLs in a comma-separated sequence on a single property that controls backgrounds. The best way to do this is to use the background-image property and provide both URLs in one declaration, separated by a comma. This creates two layers on the same element, with the first URL representing the top layer and the second the bottom. This approach is explicit and scalable as you add more layers. The shorthand background property can also accept multiple layers, but using background-image keeps the intent clear and is commonly used when only the image sources matter. An attempt to put two values inside one property separated by a semicolon is invalid, because a property value cannot include a semicolon. And omitting the semicolon at the end of the declaration is not proper CSS syntax, even though some parsers might still read it.

Multiple background images are applied by listing the image URLs in a comma-separated sequence on a single property that controls backgrounds. The best way to do this is to use the background-image property and provide both URLs in one declaration, separated by a comma. This creates two layers on the same element, with the first URL representing the top layer and the second the bottom. This approach is explicit and scalable as you add more layers. The shorthand background property can also accept multiple layers, but using background-image keeps the intent clear and is commonly used when only the image sources matter. An attempt to put two values inside one property separated by a semicolon is invalid, because a property value cannot include a semicolon. And omitting the semicolon at the end of the declaration is not proper CSS syntax, even though some parsers might still read it.