diff --git a/src/core/directives/format-text.ts b/src/core/directives/format-text.ts
index a790499db..8ac3ea96f 100644
--- a/src/core/directives/format-text.ts
+++ b/src/core/directives/format-text.ts
@@ -876,7 +876,7 @@ export class CoreFormatTextDirective implements OnChanges, OnDestroy, AsyncDirec
                         if (iframe.contentDocument) {
                             const css = document.createElement('style');
                             css.setAttribute('type', 'text/css');
-                            css.innerHTML = 'iframe {width: 100%;height: 100%;}';
+                            css.innerHTML = 'iframe {width: 100%;height: 100%;position:absolute;top:0; left:0;}';
                             iframe.contentDocument.head.appendChild(css);
                         }
                     });
diff --git a/src/core/services/utils/iframe.ts b/src/core/services/utils/iframe.ts
index 6837b2625..93e9a0933 100644
--- a/src/core/services/utils/iframe.ts
+++ b/src/core/services/utils/iframe.ts
@@ -344,7 +344,8 @@ export class CoreIframeUtilsProvider {
 
         element.classList.add('core-loading');
 
-        const treatElement = (sendResizeEvent: boolean = false) => {
+        const treatElement = (sendResizeEvent = false) => {
+
             this.checkOnlineFrameInOffline(element, isSubframe);
 
             const { window, document } = this.getContentWindowAndDocument(element);
@@ -361,10 +362,12 @@ export class CoreIframeUtilsProvider {
 
             // Iframe content has been loaded.
             // Send a resize events to the iframe so it calculates the right size if needed.
-            if (window && sendResizeEvent) {
+            if (sendResizeEvent) {
                 element.classList.remove('core-loading');
 
-                setTimeout(() => window.dispatchEvent && window.dispatchEvent(new Event('resize')), 1000);
+                if (window) {
+                    setTimeout(() => window.dispatchEvent && window.dispatchEvent(new Event('resize')), 1000);
+                }
             }
         };