<posOffset> (Absolute Position Offset)

This element specifies an absolute measurement for the positioning of a floating DrawingML object within a WordprocessingML document. This measurement shall be calculated relative to the top left edge of the positioning base specified by the parent element's @relativeFrom attribute.

example: 
<wp:anchor … >
  <wp:positionH relativeFrom="page">
    <wp:posOffset>914400</wp:posOffset>
  </wp:positionH>
  <wp:positionV relativeFrom="page">
    <wp:posOffset>457200</wp:posOffset>
  </wp:positionV>
</wp:anchor>

The <posOffset> element specifies the absolute positioning of the object relative to the top-left edge of the page in EMUs. ]

The possible values for this element are defined by the ST_PositionOffset simple type (§5.5.3.3).

Parent Elements

<positionH> (§5.5.2.10); <positionV> (§5.5.2.11)