Gets the X coordinate of the top-left corner of the window's viewport, in screen coordinates.

Note: This coordinate is reported in CSS pixels, not in hardware pixels. That means it can be affected by the zoom level; to compute the actual number of physical screen pixels, you should use the nsIDOMWindowUtils.screenPixelsPerCSSPixel property.


screenX = window.mozInnerScreenX;


  • screenX stores the window.mozInnerScreenX property value.
  • The window.mozInnerScreenX property is a floating point, read-only value; it has no default value.


Not part of any W3C technical specification or recommendation.

See also

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 Contributors to this page: sarafec, fscholz, teoli, libreGeekingKid, Sheppy, ethertank
 Last updated by: sarafec,