diff --git a/src/markdown_exec/formatters/base.py b/src/markdown_exec/formatters/base.py
index 66c15af..7590670 100644
--- a/src/markdown_exec/formatters/base.py
+++ b/src/markdown_exec/formatters/base.py
@@ -43,22 +43,27 @@ def base_format(  # noqa: WPS231
     """
     markdown = MarkdownConverter(md)
     extra = options.get("extra", {})
+
     try:
         output = run(code, **extra)
     except RuntimeError as error:
         logger.warning(f"Execution of {language} code block exited with non-zero status")
         return markdown.convert(str(error))
-    if html and source:
-        placeholder = str(uuid4())
+
+    if html:
+        if source:
+            placeholder = str(uuid4())
+            wrapped_output = add_source(
+                source=code, location=source, output=placeholder, language=language, tabs=tabs, **extra
+            )
+            return markdown.convert(wrapped_output, stash={placeholder: output})
+        return Markup(output)
+
+    wrapped_output = output
+    if result:
+        wrapped_output = code_block(result, output)
+    if source:
         wrapped_output = add_source(
-            source=code, location=source, output=placeholder, language=language, tabs=tabs, **extra
+            source=code, location=source, output=wrapped_output, language=language, tabs=tabs, **extra
         )
-        markup = markdown.convert(wrapped_output, stash={placeholder: output})
-    elif html:
-        markup = Markup(output)
-    elif result:
-        wrapped_output = code_block(result, output)
-        markup = markdown.convert(wrapped_output)
-    else:
-        markup = markdown.convert(output)
-    return markup
+    return markdown.convert(wrapped_output)
diff --git a/tests/test_base_formatter.py b/tests/test_base_formatter.py
index b203b48..96520ae 100644
--- a/tests/test_base_formatter.py
+++ b/tests/test_base_formatter.py
@@ -1,6 +1,6 @@
 """Tests for the base formatter."""
 
-
+import pytest
 from markdown import Markdown
 
 from markdown_exec.formatters.base import base_format
@@ -15,3 +15,15 @@ def test_no_p_around_html(md: Markdown) -> None:
     code = "<pre><code>hello</code></pre>"
     html = base_format("whatever", lambda _: _, code, md, html=True, source="", result="", tabs=("", ""))
     assert html == code
+
+
+@pytest.mark.parametrize("html", [True, False])
+def test_render_source(md: Markdown, html: bool) -> None:
+    """Assert source is rendered.
+
+    Parameters:
+        md: A Markdown instance (fixture).
+        html: Whether output is HTML or not.
+    """
+    markup = base_format("python", lambda _: _, "hello", md, html, "tabbed-left", "", ("Source", "Output"))
+    assert "Source" in markup