If a 'background-image' is specified, this property specifies the initial position on the X-axis of the background image specified in the browser window if it is not continuously tiled in the element's rendering box. A minimum value for this property indicates the left side of the rendering box, and a maximum value is at the right side. The Y-axis component of the background position can be specified using the 'background', 'background-position' or 'background-position-y' properties.

div.marked {   background-image: url(watermark.jpg);   background-position-x: center }
Possible Values
[Percentage]: Percentage is in reference to the dimensions of the box of the current element. Value specifies the percentage on BOTH the image and the canvas and may be negative (eg: 20% indicates the reference point 20% from the left side of the image is to be located at 20% from the left side of the element's rendering box
[Length]: Represents an absolute X-coordinate position for the image and may be negative. Standard Absolute or Relative Length Units may be used here
left|center|right: Keywords representing X-axis screen positions for image placement

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