deviceXDPI

Summary

Retrieves the device’s horizontal Dots Per Inch (DPI) value.

Property of css/cssom/screen css/cssom/screen

Syntax

var result = element.deviceXDPI;
element.deviceXDPI = value;

Examples

The following examples use the deviceXDPI property to retrieve the horizontal DPI of the screen. The function in this example returns 1 if Internet Explorer is not adjusting the scale of the screen.

<script>
  function fnScaleFactorX() {
    var nScaleFactor = screen.deviceXDPI / screen.logicalXDPI;
    return nScaleFactor;
  }
</script>

This example uses the -ms-zoom property of the BODY element to adjust the scale of the page “manually” if Internet Explorer is not adjusting the scale of the screen and the user’s horizontal DPI is higher than normal. This is a simple but imprecise way to make a document look the same on higher resolution screens. You can achieve finer control over the layout of your documents by modifying the properties of individual elements or groups of elements.

<script>
  // change layout on HighDPI screens when IE not scaling
  function fnScaleManually()
  {
    // normal DPI
    var constNorm = 96;

    // scaling is off and DPI higher than normal
    if ((screen.deviceXDPI == screen.logicalXDPI)
      && (screen.deviceXDPI > constNorm))
    {
      document.body.style.zoom =
        constNorm / screen.logicalXDPI;
    }
  }
</script>

Notes

Remarks

On most systems, there is no difference between horizontal and vertical DPI. The deviceXDPI property was introduced in Microsoft Internet Explorer 6. For information about how Internet Explorer 6 and later can adjust the scale of the display on screens with higher-than-normal DPI, see Adjusting Scale for Higher DPI Screens.

deviceXDPI

Summary

Syntax

Examples

Notes

Remarks

Syntax

Standards information

See also

Related articles

CSSOM

Related pages

Attributions