fixed embedding issue with FRAMESET/FRAME elements

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

@@ -1135,8 +1135,12 @@ this.SingleFileCore = this.SingleFileCore || (() => {
 			if (frameElement.tagName == "OBJECT") {
 				frameElement.setAttribute("data", "data:text/html," + content);
 			} else {
-				frameElement.setAttribute("srcdoc", content);
-				frameElement.removeAttribute("src");
+				if (frameElement.tagName == "FRAME") {
+					frameElement.setAttribute("src", "data:text/html," + content.replace(/#/g, "%23"));
+				} else {
+					frameElement.setAttribute("srcdoc", content);
+					frameElement.removeAttribute("src");
+				}
 			}
 		}