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.
- If the user is using one of the default Windows themes—Luna, Royale, Zune, or Aero (including Vista Basic, Vista Advanced, and Aero Glass)—this is 1. Otherwise it's 0.
Accepts min/max prefixes: no