SafeHTML Anti-XSS filter

This parser strip down all potentially dangerous content within HTML: * opening tag without its closing tag * closing tag without its opening tag * any of these tags: “base”, “basefont”, “head”, “html”, “body”, “applet”, “object”, “iframe”, “frame”, “frameset”, “script”, “layer”, “ilayer”, “embed”, “bgsound”, “link”, “meta”, “style”, “title”, “blink”, “xml” etc. * any of these attributes: on*, data*, dynsrc * javascript:/vbscript:/about: etc. protocols * expression/behavior etc. in styles * any other active content