Apply styles to application/xml autogenerated pages

apply.js

@@ -134,6 +134,14 @@ function applyStyles(styleHash) {
 	}
 
 	if (Object.keys(g_styleElements).length) {
+		// when site response is application/xml Chrome displays our style elements
+		// under document.documentElement as plain text so we need to move them into HEAD
+		// (which already is autogenerated at this moment for the xml response)
+		if (document.head && document.head.firstChild && document.head.firstChild.id == "xml-viewer-style") {
+			for (var id in g_styleElements) {
+				document.head.appendChild(document.getElementById(id));
+			}
+		}
 		document.addEventListener("DOMContentLoaded", addDocumentStylesToAllIFrames);
 		iframeObserver.start();
 	}