diff --git a/src/addon/mod/resource/providers/helper.ts b/src/addon/mod/resource/providers/helper.ts
index 62a00e511..c1566e931 100644
--- a/src/addon/mod/resource/providers/helper.ts
+++ b/src/addon/mod/resource/providers/helper.ts
@@ -142,7 +142,7 @@ export class AddonModResourceHelperProvider {
             mimetype = this.mimetypeUtils.getMimeType(ext);
         }
 
-        return mimetype == 'text/html';
+        return mimetype == 'text/html' || mimetype == 'application/xhtml+xml';
     }
 
     /**
diff --git a/src/assets/js/iframe-treat-links.js b/src/assets/js/iframe-treat-links.js
index 68f83571b..c585c96fe 100644
--- a/src/assets/js/iframe-treat-links.js
+++ b/src/assets/js/iframe-treat-links.js
@@ -49,7 +49,7 @@
 
         // Find the link being clicked.
         var el = event.target;
-        while (el && el.tagName !== 'A') {
+        while (el && (el.tagName !== 'A' && el.tagName !== 'a')) {
             el = el.parentElement;
         }
 
diff --git a/src/providers/utils/iframe.ts b/src/providers/utils/iframe.ts
index 0fdc5af74..6a044b558 100644
--- a/src/providers/utils/iframe.ts
+++ b/src/providers/utils/iframe.ts
@@ -329,7 +329,7 @@ export class CoreIframeUtilsProvider {
 
             // Find the link being clicked.
             let el = <Element> event.target;
-            while (el && el.tagName !== 'A') {
+            while (el && el.tagName !== 'A' && el.tagName !== 'a') {
                 el = el.parentElement;
             }