encode base URI

lib/single-file/single-file-browser.js

@@ -75,7 +75,7 @@ this.SingleFile = (() => {
 			let baseElement = doc.querySelector("base");
 			if (!baseElement) {
 				baseElement = doc.createElement("base");
-				baseElement.href = baseURI;
+				baseElement.href = encodeURIComponent(baseURI);
 				doc.head.insertBefore(baseElement, doc.head.firstChild);
 			}
 			return {