HTML output for cross-browser support

res/css/structures/_RoomView.scss

@@ -205,10 +205,6 @@ limitations under the License.
     clear: both;
 }
 
-.mx_RoomView_MessageList .katex {
-    font-size: 1.3em;
-}
-
 li.mx_RoomView_myReadMarker_container {
     height: 0px;
     margin: 0px;

src/HtmlUtils.tsx

@@ -426,7 +426,7 @@ export function bodyToHtml(content: IContent, highlights: string[], opts: IOpts
                             {
                                 throwOnError: false,
                                 displayMode: d.display,
-                                output: "mathml",
+                                output: "htmlAndMathml",
                             })
                     });
                 });