diff --git a/src/addons/filter/displayh5p/services/handlers/displayh5p.ts b/src/addons/filter/displayh5p/services/handlers/displayh5p.ts
index 0ef26c726..8e4dbcb47 100644
--- a/src/addons/filter/displayh5p/services/handlers/displayh5p.ts
+++ b/src/addons/filter/displayh5p/services/handlers/displayh5p.ts
@@ -20,7 +20,7 @@ import { makeSingleton } from '@singletons';
 import { CoreH5PPlayerComponent } from '@features/h5p/components/h5p-player/h5p-player';
 import { CoreUrl } from '@singletons/url';
 import { CoreH5PHelper } from '@features/h5p/classes/helper';
-import { CoreTemplateElement } from '@/core/utils/create-html-element';
+import { CoreText } from '@singletons/text';
 
 /**
  * Handler to support the Display H5P filter.
@@ -37,41 +37,39 @@ export class AddonFilterDisplayH5PHandlerService extends CoreFilterDefaultHandle
     filter(
         text: string,
     ): string | Promise<string> {
-        CoreTemplateElement.innerHTML = text;
+        return CoreText.processHTML(text, (element) => {
+            const h5pIframes = <HTMLIFrameElement[]> Array.from(element.querySelectorAll('iframe.h5p-iframe'));
 
-        const h5pIframes = <HTMLIFrameElement[]> Array.from(CoreTemplateElement.content.querySelectorAll('iframe.h5p-iframe'));
+            // Replace all iframes with an empty div that will be treated in handleHtml.
+            h5pIframes.forEach((iframe) => {
+                const placeholder = document.createElement('div');
 
-        // Replace all iframes with an empty div that will be treated in handleHtml.
-        h5pIframes.forEach((iframe) => {
-            const placeholder = document.createElement('div');
+                placeholder.classList.add('core-h5p-tmp-placeholder');
+                placeholder.setAttribute('data-player-src', iframe.src);
 
-            placeholder.classList.add('core-h5p-tmp-placeholder');
-            placeholder.setAttribute('data-player-src', iframe.src);
+                iframe.parentElement?.replaceChild(placeholder, iframe);
+            });
 
-            iframe.parentElement?.replaceChild(placeholder, iframe);
+            // Handle H5P iframes embedded using the embed HTML code.
+            const embeddedH5PIframes = <HTMLIFrameElement[]> Array.from(
+                element.querySelectorAll('iframe.h5p-player'),
+            );
+
+            embeddedH5PIframes.forEach((iframe) => {
+                // Add the preventredirect param to allow authenticating if auto-login fails.
+                iframe.src = CoreUrl.addParamsToUrl(iframe.src, { preventredirect: false });
+
+                // Add resizer script so the H5P has the right height.
+                CoreH5PHelper.addResizerScript();
+
+                // If the iframe has a small height, add some minimum initial height so it's seen if auto-login fails.
+                const styleHeight = Number(iframe.style.height);
+                const height = Number(iframe.getAttribute('height'));
+                if ((!height || height < 400) && (!styleHeight || styleHeight < 400)) {
+                    iframe.style.height = '400px';
+                }
+            });
         });
-
-        // Handle H5P iframes embedded using the embed HTML code.
-        const embeddedH5PIframes = <HTMLIFrameElement[]> Array.from(
-            CoreTemplateElement.content.querySelectorAll('iframe.h5p-player'),
-        );
-
-        embeddedH5PIframes.forEach((iframe) => {
-            // Add the preventredirect param to allow authenticating if auto-login fails.
-            iframe.src = CoreUrl.addParamsToUrl(iframe.src, { preventredirect: false });
-
-            // Add resizer script so the H5P has the right height.
-            CoreH5PHelper.addResizerScript();
-
-            // If the iframe has a small height, add some minimum initial height so it's seen if auto-login fails.
-            const styleHeight = Number(iframe.style.height);
-            const height = Number(iframe.getAttribute('height'));
-            if ((!height || height < 400) && (!styleHeight || styleHeight < 400)) {
-                iframe.style.height = '400px';
-            }
-        });
-
-        return CoreTemplateElement.innerHTML;
     }
 
     /**
diff --git a/src/addons/filter/mediaplugin/services/handlers/mediaplugin.ts b/src/addons/filter/mediaplugin/services/handlers/mediaplugin.ts
index 6d111dca4..363cc109c 100644
--- a/src/addons/filter/mediaplugin/services/handlers/mediaplugin.ts
+++ b/src/addons/filter/mediaplugin/services/handlers/mediaplugin.ts
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-import { CoreTemplateElement } from '@/core/utils/create-html-element';
+import { CoreText } from '@singletons/text';
 import { AddonFilterMediaPluginVideoJS } from '@addons/filter/mediaplugin/services/videojs';
 import { Injectable } from '@angular/core';
 
@@ -33,15 +33,13 @@ export class AddonFilterMediaPluginHandlerService extends CoreFilterDefaultHandl
      * @inheritdoc
      */
     filter(text: string): string | Promise<string> {
-        CoreTemplateElement.innerHTML = text;
+        return CoreText.processHTML(text, (element) => {
+            const videos = Array.from(element.querySelectorAll('video'));
 
-        const videos = Array.from(CoreTemplateElement.content.querySelectorAll('video'));
-
-        videos.forEach((video) => {
-            AddonFilterMediaPluginVideoJS.treatYoutubeVideos(video);
+            videos.forEach((video) => {
+                AddonFilterMediaPluginVideoJS.treatYoutubeVideos(video);
+            });
         });
-
-        return CoreTemplateElement.innerHTML;
     }
 
     /**
diff --git a/src/core/services/utils/dom.ts b/src/core/services/utils/dom.ts
index f074d20c8..924ef2b8c 100644
--- a/src/core/services/utils/dom.ts
+++ b/src/core/services/utils/dom.ts
@@ -55,7 +55,7 @@ import { CorePopovers, OpenPopoverOptions } from '@services/popovers';
 import { CoreViewer } from '@features/viewer/services/viewer';
 import { CoreLoadings } from '@services/loadings';
 import { CoreErrorHelper, CoreErrorObject } from '@services/error-helper';
-import { convertTextToHTMLElement, CoreTemplateElement } from '@/core/utils/create-html-element';
+import { convertTextToHTMLElement } from '@/core/utils/create-html-element';
 import { CoreHTMLClasses } from '@singletons/html-classes';
 
 /*
@@ -197,7 +197,7 @@ export class CoreDomUtilsProvider {
      * @param html Text to convert.
      * @returns Element.
      *
-     * @deprecated since 4.5. Use convertToElement directly instead.
+     * @deprecated since 4.5. Use convertTextToHTMLElement directly instead.
      */
     convertToElement(html: string): HTMLElement {
         return convertTextToHTMLElement(html);
@@ -262,24 +262,23 @@ export class CoreDomUtilsProvider {
      * @returns Fixed HTML text.
      */
     fixHtml(html: string): string {
-        CoreTemplateElement.innerHTML = html;
+        return CoreText.processHTML(html, (element) => {
+            // eslint-disable-next-line no-control-regex
+            const attrNameRegExp = /[^\x00-\x20\x7F-\x9F"'>/=]+/;
+            const fixElement = (element: Element): void => {
+                // Remove attributes with an invalid name.
+                Array.from(element.attributes).forEach((attr) => {
+                    if (!attrNameRegExp.test(attr.name)) {
+                        element.removeAttributeNode(attr);
+                    }
+                });
 
-        // eslint-disable-next-line no-control-regex
-        const attrNameRegExp = /[^\x00-\x20\x7F-\x9F"'>/=]+/;
-        const fixElement = (element: Element): void => {
-            // Remove attributes with an invalid name.
-            Array.from(element.attributes).forEach((attr) => {
-                if (!attrNameRegExp.test(attr.name)) {
-                    element.removeAttributeNode(attr);
-                }
-            });
+                Array.from(element.children).forEach(fixElement);
+            };
 
             Array.from(element.children).forEach(fixElement);
-        };
+        });
 
-        Array.from(CoreTemplateElement.content.children).forEach(fixElement);
-
-        return CoreTemplateElement.innerHTML;
     }
 
     /**
diff --git a/src/core/singletons/dom.ts b/src/core/singletons/dom.ts
index e35035472..c35b87ed6 100644
--- a/src/core/singletons/dom.ts
+++ b/src/core/singletons/dom.ts
@@ -17,7 +17,7 @@ import { CoreUtils } from '@services/utils/utils';
 import { CoreEventObserver } from '@singletons/events';
 import { CorePlatform } from '@services/platform';
 import { CoreWait } from './wait';
-import { CoreTemplateElement } from '../utils/create-html-element';
+import { convertTextToHTMLElement } from '../utils/create-html-element';
 
 /**
  * Singleton with helper functions for dom.
@@ -118,9 +118,9 @@ export class CoreDom {
             return true;
         }
 
-        CoreTemplateElement.innerHTML = content;
+        const element = convertTextToHTMLElement(content);
 
-        return !CoreDom.elementHasContent(CoreTemplateElement.content);
+        return !CoreDom.elementHasContent(element);
     }
 
     /**
diff --git a/src/core/utils/create-html-element.ts b/src/core/utils/create-html-element.ts
index 60f98e5c2..076d6bbc4 100644
--- a/src/core/utils/create-html-element.ts
+++ b/src/core/utils/create-html-element.ts
@@ -12,18 +12,17 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// A template element to convert HTML to element.
-export const CoreTemplateElement: HTMLTemplateElement = document.createElement('template');
-
 /**
- * Convert some HTML as text into an HTMLElement. This HTML is put inside a div or a body.
+ * Convert some HTML as text into an HTMLElement. This HTML is put inside a div.
  *
  * @param html Text to convert.
  * @returns Element.
  */
 export function convertTextToHTMLElement(html: string): HTMLElement {
-   // Add a div to hold the content, that's the element that will be returned.
-   CoreTemplateElement.innerHTML = '<div>' + html + '</div>';
+    const element = document.createElement('template');
 
-   return <HTMLElement> CoreTemplateElement.content.children[0];
+    // Add a div to hold the content, that's the element that will be returned.
+    element.innerHTML = '<div>' + html + '</div>';
+
+    return <HTMLElement> element.content.children[0];
 }