Non-standard
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.
Summary
The :-moz-system-metric(windows-default-theme) CSS pseudo-class matches an element if the user is currently using one of the following themes in Windows: Luna, Royale, Zune, or Aero (i.e., Vista Basic, Vista Standard, or Aero Glass). This will exclude Windows Classic themes as well as third-party themes.
This selector is intended for use mainly by theme developers.
Example
HTML Content
<p id="defaultThemes"> This paragraph should have a green background with Luna/Royale/Zune/Aero Windows themes and red with other themes. </p> <p id="nonDefaultThemes"> This paragraph should have a green background with Windows Classic or third-party themes and red with other themes. </p> <p id="notSupported">Theme detection is not supported.</p>
CSS Content
#defaultThemes,
#nonDefaultThemes {
background-color: #FFA0A0;
}
#defaultThemes:-moz-system-metric(windows-default-theme) {
background-color: #A0FFA0;
}
#nonDefaultThemes:not(-moz-system-metric(windows-default-theme)) {
background-color: #A0FFA0;
}
#notSupported:-moz-system-metric(windows-default-theme),
#notSupported:not(:-moz-system-metric(windows-default-theme)) {
display: none;
}
Specifications
Not part of any specification.
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | Not supported | 3.0 (1.9)[1] | Not supported | Not supported | Not supported |
| Feature | Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | Not supported | ? | Not supported | Not supported | Not supported |
[1] Implemented in bug 426660. Changed the behavior of Royale and Zone to work the same as Luna in bug 429176.