14.2.1 Background properties: 'background-color', 'background-image', 'background-repeat', 'background-attachment', 'background-position', and 'background'. This property sets the background color of an element, either a <color> value or the keyword 'transparent', to make the underlying colors shine through.
1 A spiral fracture happens when the break spirals around the bone, which can happen if the bone is twisted. 2  A compression fracture happens when vertebrae in the spinal column are pushed together in an accident or because of osteoporosis.
Causes. Mitral regurgitation may be caused by: 1  Mitral valve prolapseâAbnormal closure of the valve with protrusion of a leaflet tip backward into the left atrium, causing it to leak. 2  Infections that cause scarring of the heart valve, such as rheumatic fever or bacterial endocarditis.