This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

Note: Since Firefox 58, this media feature is no longer available to web content — it is only available internally (e.g. to XUL / chrome code). See bug 1396066 for more details.

The -moz-windows-accent-color-in-titlebar Gecko-only CSS media feature can be used to apply styles based on whether accent colors are enabled in Microsoft Windows titlebars.


In recent Windows versions (e.g., 10), if accent colors are enabled in window titlebars, this is 1. Otherwise it's 0.

Media: media/visual
Accepts min/max prefixes: no


@media (-moz-windows-accent-color-in-titlebar: 1) {
  h1 {
    color: -moz-win-accentcolortext;

  body {
    background-color: -moz-win-accentcolor;

See also

  • This feature is closely related to the Mozilla-specific <color> values -moz-win-accentcolor and -moz-win-accentcolortext, which allow you to access the Windows accent and overlaid text accent colors from CSS.