// http://ie.microsoft.com/testdrive/HTML5/CompatInspector/help/snippet.txt
// Snippet 1: Place this inside the "OnBeforeResponse" handler in your FiddlerScript
InjectInspectorScript(oSession);

// Snippet 2: Place this near the end of your FiddlerScript (within the Handlers class)
public static RulesOption("Use Compat Inspector")
var m_UseCompatInspector: boolean = false;
static function InjectInspectorScript(oSession: Session)
{
	if(!m_UseCompatInspector) return;
	
	// Ensure we only inject into HTML
	if (oSession.url.EndsWith(".js")) return;
	if (oSession.url.EndsWith(".css")) return;
	if (!oSession.oResponse.MIMEType.Contains("text/html")) return;
	
	// Retrieve the response body
	var sBody = oSession.GetResponseBodyAsString();
	// One final check to ensure the content looks like HTML
	if (!/^\uFEFF?\s*</.exec(sBody)) return;
	
	// Prepare to inject
	var pos = 0; // Initial position is start of document
	
	// Locate important elements in the page
	var doctype = sBody.IndexOf("<!doctype", StringComparison.OrdinalIgnoreCase);
	var meta = sBody.IndexOf("X-UA-Compatible", StringComparison.OrdinalIgnoreCase);
	var script = sBody.IndexOf("<script", StringComparison.OrdinalIgnoreCase);
	
	// Place after doctype (if present)
	if (doctype != -1) doctype = sBody.IndexOf(">", doctype + 1);
	if (doctype != -1 && doctype != sBody.Length - 1) pos = doctype + 1;
	
	// Place after first X-UA-Compatible meta tag (if present)
	if (meta != -1) meta = sBody.IndexOf(">", meta + 1);
	if (meta != -1 && meta != sBody.Length - 1) pos = meta + 1;
	
	// Place before any script tags that occur before the current position (if present)
	if (script != -1 && script < pos) pos = script;
	
	// Perform the injection at the detected location
	oSession.utilSetResponseBody(
		sBody.Insert(pos, "<script src='http://ie.microsoft.com/testdrive/HTML5/CompatInspector/inspector.js'></script>")
	);
}