Set correct charset in HTML when HTML filter is active (#736)

core/manipulate-dom.js

@@ -117,6 +117,9 @@ manipulateDOM._removeCrossOriginAndIntegrityAttr = function (details) {
                     }
                     str += decoder.decode(); // end-of-stream
 
+                    // set UTF-8 in document
+                    str = str.replace(new RegExp(`charset=["']?${charset}["']?`), 'charset="utf8"');
+
                     // remove crossorigin and integrity attributes
                     str = str.replace(/<(link|script)[^>]+>/ig, (m) => {
                         // eslint-disable-next-line no-use-before-define

pages/updates/updates.html

@@ -35,6 +35,7 @@
                         <p>Improved</p>
                         <ul>
                             <li>Unused permission removed (since Firefox 86) <a href="https://codeberg.org/nobody/LocalCDN/issues/734">#734</a></li>
+                            <li>Set correct charset in HTML when HTML filter is active <a href="https://codeberg.org/nobody/LocalCDN/issues/736">#736</a></li>
                         </ul>
                     </div>
                     <div id="generator-section">