This element is unstyled save for a background color of gray. However, it contains an inline element of margin -10px and background-color of red, giving it a red background and a -10px margin. Margins on inline elements do not affect line-height calculations, so all lines in this element should have the same line-height. However, there should be a -10px margin to the left side of the inline box in the first line it appears, and a -10px margin to the right side of the inline element box in the last line where it appears. Individual properties are tested here.