I can't show SVG content using _IEWriteDocHTML!
If i save the same SVG code into a file and navigate to the file, it works.
Global $oIE = _IECreateEmbedded()
GUICreate('TEXT?',180,99,5,5, BitOR(0x00C00000, 0x00080000))
GUICtrlCreateObj($oIE,4,4,172,64)
_IENavigate($oIE, "about:blank")
_IEDocWriteHTML($oIE, '<HTML><BODY><svg xmlns="http://www.w3.org/2000/svg" width="400" height="110"> <rect width="300" height="100" style="fill:rgb(0,0,255);stroke-width:3;stroke:rgb(0,0,0)"