This article is Not Ready.
Needs Summary: This article does not have a summary. Summaries give a brief overview of the topic and are automatically included on some listing pages that link to this article.
Needs Examples: This section should include examples.
If the value is set to "0" or "", the top margin is on the top edge of the window or frame. By default, when you set the value of this property, the opposite margin is set to the same value.
Related pages (MSDN)
This article contains content originally from external sources.
Portions of this content come from the Microsoft Developer Network: [Windows Internet Explorer API reference Article]