diff --git a/renderer.php b/renderer.php
index 014a9f2..21740ff 100644
--- a/renderer.php
+++ b/renderer.php
@@ -64,8 +64,65 @@ public function formulation_and_controls(question_attempt $qa, question_display_
             ]);
         }
 
-        $renderer = new question_ui_renderer($question->ui->formulation, $question->ui->placeholders, $options, $qa);
-        return $renderer->render();
+        global $PAGE, $OUTPUT;
+        $oldpage = $PAGE;
+        $oldoutput = $OUTPUT; // Class moodle_page also modifies global $OUTPUT variable.
+
+        try {
+            $PAGE = new moodle_page();
+            $PAGE->set_context($options->context);
+            $PAGE->set_pagelayout('embedded');
+            $PAGE->set_pagetype($oldpage->pagetype);
+            $PAGE->set_url($oldpage->url);
+
+            $qformulation = new question_ui_renderer($question->ui->formulation, $question->ui->placeholders, $options,
+                $qa);
+            $feedback = html_writer::nonempty_tag('div', $this->feedback_in_iframe($qa, $options),
+                ['class' => 'outcome clearfix']);
+
+            $editor = editors_get_preferred_editor(FORMAT_HTML); // Only for testing purposes!
+            $editor->use_editor('mytextareaid', [
+                'context' => $options->context,
+                'enable_filemanagement' => true,
+                'maxfiles' => EDITOR_UNLIMITED_FILES,
+            ], question_utils::get_filepicker_options($options->context, 0));
+
+            $questionsrc = $this->output->render_from_template('qtype_questionpy/iframe_content', [
+                'question' => $qformulation->render(),
+                'feedback' => $feedback,
+                'filepicker' => $this->get_file_picker_test($options->context),
+            ]);
+
+            $outputrenderer = $PAGE->get_renderer('core', null);
+            $iframesrc = $outputrenderer->header();
+            $iframesrc .= $questionsrc;
+            $iframesrc .= $outputrenderer->footer();
+            return '<iframe srcdoc="' . htmlspecialchars($iframesrc) . '"></iframe>';
+
+        } finally {
+            $PAGE = $oldpage;
+            $OUTPUT = $oldoutput;
+        }
+
+        return '';
+    }
+
+    protected function get_file_picker_test($context) {
+        global $CFG, $PAGE;
+        require_once($CFG->dirroot . '/lib/form/filemanager.php');
+
+        $pickeroptions = new stdClass();
+        $pickeroptions->mainfile = null;
+        $pickeroptions->maxfiles = 10;
+        $pickeroptions->itemid = 1;
+        $pickeroptions->context = $context;
+        $pickeroptions->return_types = FILE_INTERNAL | FILE_CONTROLLED_LINK;
+        $pickeroptions->accepted_types = '*';
+
+        $fm = new form_filemanager($pickeroptions);
+        $fm->options->maxbytes = 10*1024*1024;
+        $filesrenderer = $PAGE->get_renderer('core', 'files');
+        return $filesrenderer->render($fm);
     }
 
     /**
@@ -80,7 +137,7 @@ public function formulation_and_controls(question_attempt $qa, question_display_
      * @return string HTML fragment.
      * @throws coding_exception
      */
-    public function feedback(question_attempt $qa, question_display_options $options): string {
+    protected function feedback_in_iframe(question_attempt $qa, question_display_options $options): string {
         $question = $qa->get_question();
         assert($question instanceof qtype_questionpy_question);
 
@@ -128,6 +185,30 @@ public function feedback(question_attempt $qa, question_display_options $options
             );
         }
 
+        if ($output) {
+            // Copied from \core_question_renderer::question.
+            $output = html_writer::tag('h4', get_string('feedback', 'question'),
+                    ['class' => 'accesshide']) . $output;
+        }
+
         return $output;
     }
+
+    /**
+     * Generate the display of the outcome part of the question. This is the
+     * area that contains the various forms of feedback. This function generates
+     * the content of this area belonging to the question type.
+     *
+     * Subclasses will normally want to override the more specific methods
+     * {specific_feedback()}, {general_feedback()} and {correct_response()}
+     * that this method calls.
+     *
+     * @param question_attempt $qa the question attempt to display.
+     * @param question_display_options $options controls what should and should not be displayed.
+     * @return string HTML fragment.
+     */
+    public function feedback(question_attempt $qa, question_display_options $options) {
+        // We display all feedbacks in the iframe.
+        return '';
+    }
 }
diff --git a/styles.css b/styles.css
index bfd2995..3e9b440 100644
--- a/styles.css
+++ b/styles.css
@@ -25,6 +25,26 @@
     display: none;
 }
 
+/* Make question iframe seamless. */
+.que.questionpy .formulation {
+    padding: 0;
+    border: 0;
+    border-radius: unset;
+    margin: 0;
+    background: unset;
+}
+
+.que.questionpy iframe {
+    border: 0;
+    padding: 0;
+    width: 100%;
+    height: 500px;
+}
+
+.que .questionpy-iframe-content.content {
+    margin: 0;
+}
+
 /* Style package selection container */
 
 .qpy-tab-content {
diff --git a/templates/iframe_content.mustache b/templates/iframe_content.mustache
new file mode 100644
index 0000000..f637eec
--- /dev/null
+++ b/templates/iframe_content.mustache
@@ -0,0 +1,44 @@
+{{!
+    This file is part of the QuestionPy Moodle plugin - https://questionpy.org
+
+    Moodle is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    Moodle is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+}}
+{{!
+    @template qtype_questionpy/iframe_content
+}}
+<div class="que">
+    <div class="content questionpy-iframe-content">
+        <div class="formulation clearfix">
+            {{{ question }}}
+            <textarea id="mytextareaid" rows="15"></textarea>
+            {{{ filepicker }}}
+            <details>
+                <summary>hohes div aufklappen</summary>
+                <div style="height: 500px">der iframe soll sich automatisch verkleinern/vergrößern,
+                    möglichst schnell und nicht störend</div>
+            </details>
+            <details>
+                <summary>breites div</summary>
+                <div style="width: 2500px">breites div, der iframe Inhalt soll nicht im gesamten so breit werden.
+                Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore
+                et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea
+                rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum
+                dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et
+                dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea
+                rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</div>
+            </details>
+        </div>
+        {{{ feedback }}}
+    </div>
+</div>