<desc>If background images have been specified, this property specifies their initial position (after any resizing) within their corresponding background positioning area.</desc>
<desc>Equivalent to '100%' for the vertical position if one or two values are given, otherwise specifies the bottom edge as the origin for the next offset.</desc>
<desc>Equivalent to '50%' ('left 50%') for the horizontal position if the horizontal position is not otherwise specified, or '50%' ('top 50%') for the vertical position if it is.</desc>
</value>
<value name="left" version="3.0" browsers="all">
<value name="left" version="4.0" browsers="all">
<desc>Equivalent to '0%' for the horizontal position if one or two values are given, otherwise specifies the left edge as the origin for the next offset.</desc>
</value>
<value name="right" version="3.0" browsers="all">
<value name="right" version="4.0" browsers="all">
<desc>Equivalent to '100%' for the horizontal position if one or two values are given, otherwise specifies the right edge as the origin for the next offset.</desc>
</value>
<value name="top" version="3.0" browsers="all">
<value name="top" version="4.0" browsers="all">
<desc>Equivalent to '0%' for the vertical position if one or two values are given, otherwise specifies the top edge as the origin for the next offset.</desc>
<desc>If background images have been specified, this property specifies their initial position (after any resizing) within their corresponding background positioning area.</desc>
<desc>Equivalent to '100%' for the vertical position if one or two values are given, otherwise specifies the bottom edge as the origin for the next offset.</desc>
<desc>Equivalent to '50%' ('left 50%') for the horizontal position if the horizontal position is not otherwise specified, or '50%' ('top 50%') for the vertical position if it is.</desc>
</value>
<value name="left" version="3.0" browsers="all">
<value name="left" version="4.0" browsers="all">
<desc>Equivalent to '0%' for the horizontal position if one or two values are given, otherwise specifies the left edge as the origin for the next offset.</desc>
</value>
<value name="right" version="3.0" browsers="all">
<value name="right" version="4.0" browsers="all">
<desc>Equivalent to '100%' for the horizontal position if one or two values are given, otherwise specifies the right edge as the origin for the next offset.</desc>
</value>
<value name="top" version="3.0" browsers="all">
<value name="top" version="4.0" browsers="all">
<desc>Equivalent to '0%' for the vertical position if one or two values are given, otherwise specifies the top edge as the origin for the next offset.</desc>