非标
此特征是非标准的，且不在标准轨道中。不要在面向 Web 的生产站点中使用它：它不适用于每个用户。实现之间可能存在大的不兼容性，且行为将来可能改变。
注意 : 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 了解更多细节。
-moz-os-version
Gecko-only
CSS
media feature
can be used to apply styles based on the user's version of Microsoft Windows. This can be useful for adapting application skins and other chrome code depending on the user's operating system version.
windows-win7
The user is on the Windows 7 operating system.
windows-win8
The user is on the Windows 8 operating system.
windows-win10
The user is on the Windows 10 operating system.
Media:
media/visual
Accepts min/max prefixes:
no