allows "application/octet-stream" as mimetype for images

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

@@ -866,6 +866,7 @@ this.SingleFileCore = this.SingleFileCore || (() => {
 	const PREFIX_DATA_URI_VIDEO = "data:video/";
 	const PREFIX_DATA_URI_IMAGE_SVG = "data:image/svg+xml";
 	const PREFIX_DATA_URI_NO_MIMETYPE = "data:;";
+	const PREFIX_DATA_URI_OCTET_STREAM = "data:application/octet-stream";
 
 	class DomProcessorHelper {
 		static async getFilename(options, content) {
@@ -1058,7 +1059,7 @@ this.SingleFileCore = this.SingleFileCore || (() => {
 					if (resourceURL && resourceURL != baseURI && DomUtil.testValidPath(resourceURL)) {
 						try {
 							const dataURI = await batchRequest.addURL(new URL(resourceURL, baseURI).href);
-							if (dataURI.startsWith(prefixDataURI) || dataURI.startsWith(PREFIX_DATA_URI_NO_MIMETYPE)) {
+							if (dataURI.startsWith(prefixDataURI) || dataURI.startsWith(PREFIX_DATA_URI_NO_MIMETYPE) || dataURI.startsWith(PREFIX_DATA_URI_OCTET_STREAM)) {
 								resourceElement.setAttribute(attributeName, dataURI);
 							} else {
 								resourceElement.setAttribute(attributeName, EMPTY_IMAGE);
@@ -1112,7 +1113,7 @@ this.SingleFileCore = this.SingleFileCore || (() => {
 					if (resourceURL && resourceURL != baseURI && DomUtil.testValidPath(resourceURL)) {
 						try {
 							let dataURI = await batchRequest.addURL(new URL(resourceURL, baseURI).href);
-							if (!dataURI.startsWith(prefixDataURI) && !dataURI.startsWith(PREFIX_DATA_URI_NO_MIMETYPE)) {
+							if (!dataURI.startsWith(prefixDataURI) && !dataURI.startsWith(PREFIX_DATA_URI_NO_MIMETYPE) && !dataURI.startsWith(PREFIX_DATA_URI_OCTET_STREAM)) {
 								resourceElement.setAttribute(attributeName, EMPTY_IMAGE);
 							}
 							return dataURI + (srcsetValue.w ? " " + srcsetValue.w + "w" : srcsetValue.d ? " " + srcsetValue.d + "x" : "");