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Home/ Questions/Q 9315899
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Editorial Team
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Editorial Team
Asked: June 19, 20262026-06-19T02:28:44+00:00 2026-06-19T02:28:44+00:00

Do HTML/CSS/JavaScript define constants representing system theme colours? I mean those colours a user

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Do HTML/CSS/JavaScript define constants representing system theme colours? I mean those colours a user can define in the operating system (or a browser) control panel. Like standard window contents background and text colours etc.

The idea is to make a web site to respect the user preferences by default, showing light text on dark background in case the user uses such a theme in his system (while following the Occam’s razor principle by avoiding introducing extra configuration).

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  1. Editorial Team
    Editorial Team
    2026-06-19T02:28:45+00:00Added an answer on June 19, 2026 at 2:28 am

    Yes you can,

    Open firebug and change some css declaration like color : ActiveBorder or see webdesign.about.com/od/colorcharts/l/blsystemcolors.htm or search the net for ‘css system colors’

    • ActiveBorder : Active window border.
    • ActiveCaption : Active window caption.
    • AppWorkspace Background color of multiple document interface.
    • Background Desktop background.
    • ButtonFace Face color for three-dimensional display elements.
    • ButtonHighlight Dark shadow for three-dimensional display elements (for edges facing away from the light source).
    • ButtonShadow Shadow color for three-dimensional display elements.
    • ButtonText Text on push buttons.
    • CaptionText Text in caption, size box, and scrollbar arrow box.
    • GrayText Grayed (disabled) text. This color is set to #000 if the current display driver does not support a solid gray color.
    • Highlight Item(s) selected in a control.
    • HighlightText Text of item(s) selected in a control.
    • InactiveBorder Inactive window border.
    • InactiveCaption Inactive window caption.
    • InactiveCaptionText Color of text in an inactive caption.
    • InfoBackground Background color for tooltip controls.
    • InfoText Text color for tooltip controls.
    • Menu Menu background.
    • MenuText Text in menus.
    • Scrollbar Scroll bar gray area.
    • ThreeDDarkShadow Dark shadow for three-dimensional display elements.
    • ThreeDFace Face color for three-dimensional display elements.
    • ThreeDHighlight Highlight color for three-dimensional display elements.
    • ThreeDLightShadow Light color for three-dimensional display elements (for edges facing the light source).
    • ThreeDShadow Dark shadow for three-dimensional display elements.
    • Window Window background.
    • WindowFrame Window frame.
    • WindowText Text in windows.

    For a better reference suggested by unor about system colors

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