srcdoc is not a data URI

lib/single-file/single-file-core.js

@@ -479,7 +479,7 @@ this.SingleFileCore = (() => {
 						setFrameEmptySrc(frameElement);
 						if (frameData.processor) {
 							const pageData = await frameData.processor.getPageData();
-							frameElement.setAttribute(frameElement.tagName == "OBJECT" ? "data" : "srcdoc", "data:text/html," + pageData.content);
+							frameElement.setAttribute(frameElement.tagName == "OBJECT" ? "data" : "srcdoc", (frameElement.tagName != "OBJECT" ? "data:text/html," : "") + pageData.content);
 							frameElement.sandbox = true;
 						}
 					}