The implementation of equals method was added JDK-7083187 to most of CSS.CssValue classes, but CSS.BackgroundImage doesn't implement equals.

Steps to reproduce:

Add these strings into EQUALS arrays in the javax/swing/text/html/CSS/4765271/CSSAttributeEqualityBug.java test:

            "background-image: none",
            "background-image: url(image.png)",

The test fails:

background-image=none is not equal to background-image=none
background-image=url(image.png) is not equal to background-image=url(image.png)
Exception in thread "main" java.lang.RuntimeException: The test failed: 2 failure(s) detected: background-image=none is not equal to background-image=none
        at CSSAttributeEqualityBug.main(CSSAttributeEqualityBug.java:122)