I found a discussion of Microsoft on 2004, why they copied all SVG elements and capitalized them: &quot;SVG has its own set of conventions for element and attribute names that is at odds with the existing .NET Framework class library.&quot; <a href="https:&#x2F;&#x2F;msdn.microsoft.com&#x2F;en-us&#x2F;library&#x2F;aa480164.aspx#avalongraphics_topic2" rel="nofollow">https:&#x2F;&#x2F;msdn.microsoft.com&#x2F;en-us&#x2F;library&#x2F;aa480164.aspx#avalo...</a>