<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="fixed" version="1.0" browsers="all">
<desc>The background is fixed with regard to the viewport. In paged media where there is no viewport, a 'fixed' background is fixed with respect to the page box and therefore replicated on every page.</desc>
</value>
<value name="left" version="1.0" 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="local" version="3.0" browsers="all">
<desc>The background is fixed with regard to the element's contents: if the element has a scrolling mechanism, the background scrolls with the element's contents.</desc>
</value>
<value name="none" version="1.0" browsers="all">
<desc>A value of 'none' counts as an image layer but draws nothing.</desc>
</value>
<value name="right" version="1.0" 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>
<desc>The background is fixed with regard to the element itself and does not scroll with its contents. (It is effectively attached to the element's border.)</desc>
</value>
<value name="top" version="1.0" 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":"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."
},
{
"name":"center",
"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."
},
{
"name":"fixed",
"desc":"The background is fixed with regard to the viewport. In paged media where there is no viewport, a 'fixed' background is fixed with respect to the page box and therefore replicated on every page."
},
{
"name":"left",
"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."
},
{
"name":"local",
"desc":"The background is fixed with regard to the element's contents: if the element has a scrolling mechanism, the background scrolls with the element's contents."
},
{
"name":"right",
"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."
},
{
"name":"scroll",
"desc":"The background is fixed with regard to the element itself and does not scroll with its contents. (It is effectively attached to the element's border.)"
},
{
"name":"top",
"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."
