diff --git a/.github/pr-assets/after-quiz-runs-in-iframe.png b/.github/pr-assets/after-quiz-runs-in-iframe.png
new file mode 100644
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diff --git a/.github/pr-assets/after-renders-as-page.png b/.github/pr-assets/after-renders-as-page.png
new file mode 100644
index 0000000..4e2faa7
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diff --git a/.github/pr-assets/before-renders-as-source.png b/.github/pr-assets/before-renders-as-source.png
new file mode 100644
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diff --git a/app/agent_wiki_explorer.py b/app/agent_wiki_explorer.py
index e641c88..602c94a 100644
--- a/app/agent_wiki_explorer.py
+++ b/app/agent_wiki_explorer.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import streamlit as st
+import streamlit.components.v1 as components
 
 from app.utils.agent_wiki import (
     WikiDocument,
@@ -17,6 +18,10 @@
 
 st.set_page_config(page_title="Agent wiki explorer", page_icon="📚")
 
+# Viewport height for embedded HTML artifacts. Tall enough that a report's first
+# screen is visible without scrolling the iframe; the iframe scrolls beyond that.
+HTML_ASSET_IFRAME_HEIGHT = 900
+
 # Map extensions of non-markdown text documents to a syntax-highlighting language
 # so artifacts like `repro_app.py` render inline as code.
 CODE_LANGUAGE_BY_EXTENSION = {
@@ -30,7 +35,6 @@
     ".js": "javascript",
     ".ts": "typescript",
     ".css": "css",
-    ".html": "html",
     ".sql": "sql",
 }
 
@@ -80,6 +84,22 @@ def _render_code_asset(document: WikiDocument, language: str) -> None:
     st.code(document_text, language=language)
 
 
+def _render_html_asset(document: WikiDocument) -> None:
+    document_text, document_error = fetch_wiki_document_text(document["path"])
+    if document_error:
+        st.error(document_error)
+        return
+    if document_text is None:
+        st.warning("The selected asset could not be loaded.")
+        return
+    st.caption(document["path"])
+    # A sandboxed iframe, so the artifact's own stylesheet cannot leak into the
+    # app chrome and its scripts (e.g. an interactive quiz) still run.
+    components.html(document_text, height=HTML_ASSET_IFRAME_HEIGHT, scrolling=True)
+    with st.expander("View source"):
+        st.code(document_text, language="html")
+
+
 def _render_other_asset() -> None:
     st.info("This asset is not rendered inline.")
 
@@ -132,6 +152,8 @@ def _render_other_asset() -> None:
     _render_markdown_document(selected_document, document_text)
 elif selected_document["is_image"]:
     _render_image_asset(selected_document)
+elif selected_document["is_html"]:
+    _render_html_asset(selected_document)
 elif selected_document["extension"] in CODE_LANGUAGE_BY_EXTENSION:
     _render_code_asset(selected_document, CODE_LANGUAGE_BY_EXTENSION[selected_document["extension"]])
 else:
diff --git a/app/utils/agent_wiki.py b/app/utils/agent_wiki.py
index 860cf27..c98ac55 100644
--- a/app/utils/agent_wiki.py
+++ b/app/utils/agent_wiki.py
@@ -31,6 +31,9 @@
 TEXT_DOCUMENT_EXTENSIONS = {".md", ".markdown", ".mdx", ".txt"}
 MARKDOWN_EXTENSIONS = {".md", ".markdown", ".mdx"}
 IMAGE_EXTENSIONS = {".png", ".jpg", ".jpeg", ".gif", ".webp", ".svg"}
+# Self-contained HTML artifacts (e.g. visual PR reports). Rendered in a sandboxed
+# iframe rather than as source, so their own styling and scripts stay intact.
+HTML_EXTENSIONS = {".html", ".htm"}
 
 ISSUES_SECTION = "issues"
 # Canonical filenames the agent wiki uses for runnable issue reproductions.
@@ -53,6 +56,7 @@ class WikiDocument(TypedDict):
     source_url: str
     is_markdown: bool
     is_image: bool
+    is_html: bool
 
 
 class WikiIssueRepro(TypedDict):
@@ -149,6 +153,10 @@ def is_image_path(path: str) -> bool:
     return _get_extension(path) in IMAGE_EXTENSIONS
 
 
+def is_html_path(path: str) -> bool:
+    return _get_extension(path) in HTML_EXTENSIONS
+
+
 def build_wiki_raw_url(path: str) -> str:
     return f"{WIKI_RAW_URL_PREFIX}/{quote(path, safe='/')}"
 
@@ -204,6 +212,7 @@ def build_wiki_documents(paths: list[str]) -> list[WikiDocument]:
                 "source_url": build_wiki_source_url(path),
                 "is_markdown": is_markdown_path(path),
                 "is_image": is_image_path(path),
+                "is_html": is_html_path(path),
             }
         )
 
diff --git a/tests/test_agent_wiki.py b/tests/test_agent_wiki.py
index d4310b6..c7609cd 100644
--- a/tests/test_agent_wiki.py
+++ b/tests/test_agent_wiki.py
@@ -48,6 +48,23 @@ def test_build_wiki_documents_includes_issue_artifacts() -> None:
     assert documents[1]["folder"] == "issues/12345"
 
 
+def test_build_wiki_documents_flags_html_artifacts_as_html() -> None:
+    documents = build_wiki_documents(
+        [
+            "pull-requests/12345/report.html",
+            "pull-requests/12345/notes.txt",
+        ]
+    )
+
+    report = documents[1]
+    assert report["path"] == "pull-requests/12345/report.html"
+    assert report["is_html"] is True
+    assert report["is_markdown"] is False
+    assert report["is_image"] is False
+    # Plain text artifacts keep rendering as code, not in an iframe.
+    assert documents[0]["is_html"] is False
+
+
 def test_get_wiki_folder_groups_issue_artifacts_by_issue_number() -> None:
     assert get_wiki_folder("issues/12345/repro_app.py") == "issues/12345"
     assert get_wiki_folder("issues/12345/nested/notes.md") == "issues/12345"