Hello I'm create an IE addon that inject a style sheet to page. CComBSTR scTagStyle = "STYLE"; IHTMLElement* elementStyle; HRESULT hr = spHTMLDoc->createElement(scTagStyle, &elementStyle); IHTMLDOMNode *domStyleNode; hr = elementStyle->QueryInterface(IID_IHTMLDOMNode, (LPVOID*)&domStyleNode); IHTMLStyleElement *IstyleElem; hr = elementStyle->QueryInterface(IID_IHTMLStyleElement, (LPVOID*)&IstyleElem); I dont know the way to set css_text to IHTMLStyleElement. Please help me solve this problem. Regards, Son Dang