diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index 8d5b8a2b..7f243ae9 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -77,7 +77,7 @@ jobs:
 
       - run: |
           mk python-release owner=vkottler \
-                            repo=runtimepy version=5.7.3
+                            repo=runtimepy version=5.7.4
         if: |
           matrix.python-version == '3.12'
           && matrix.system == 'ubuntu-latest'
diff --git a/README.md b/README.md
index 9741a426..629fb7fa 100644
--- a/README.md
+++ b/README.md
@@ -2,11 +2,11 @@
     =====================================
     generator=datazen
     version=3.1.4
-    hash=ef917873929a5dc6a70367fde7f1447f
+    hash=fbb71900eae64b008d2a2df1b7dde92b
     =====================================
 -->
 
-# runtimepy ([5.7.3](https://pypi.org/project/runtimepy/))
+# runtimepy ([5.7.4](https://pypi.org/project/runtimepy/))
 
 [![python](https://img.shields.io/pypi/pyversions/runtimepy.svg)](https://pypi.org/project/runtimepy/)
 ![Build Status](https://github.com/vkottler/runtimepy/workflows/Python%20Package/badge.svg)
diff --git a/local/variables/package.yaml b/local/variables/package.yaml
index f5b58ba7..cc1ab4b9 100644
--- a/local/variables/package.yaml
+++ b/local/variables/package.yaml
@@ -1,5 +1,5 @@
 ---
 major: 5
 minor: 7
-patch: 3
+patch: 4
 entry: runtimepy
diff --git a/pyproject.toml b/pyproject.toml
index 1218442f..b6c6328f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta:__legacy__"
 
 [project]
 name = "runtimepy"
-version = "5.7.3"
+version = "5.7.4"
 description = "A framework for implementing Python services."
 readme = "README.md"
 requires-python = ">=3.11"
diff --git a/runtimepy/__init__.py b/runtimepy/__init__.py
index 81245040..233823eb 100644
--- a/runtimepy/__init__.py
+++ b/runtimepy/__init__.py
@@ -1,7 +1,7 @@
 # =====================================
 # generator=datazen
 # version=3.1.4
-# hash=37a32f51e0bf04276100ce27658b7f8f
+# hash=cb3ed2d01203d78ad794d39500d706f9
 # =====================================
 
 """
@@ -10,7 +10,7 @@
 
 DESCRIPTION = "A framework for implementing Python services."
 PKG_NAME = "runtimepy"
-VERSION = "5.7.3"
+VERSION = "5.7.4"
 
 # runtimepy-specific content.
 METRICS_NAME = "metrics"
diff --git a/runtimepy/data/js/markdown_page.js b/runtimepy/data/js/markdown_page.js
new file mode 100644
index 00000000..f787f4a8
--- /dev/null
+++ b/runtimepy/data/js/markdown_page.js
@@ -0,0 +1,24 @@
+/* Dark is hard-coded initial state (in HTML). */
+let lightMode = false;
+
+function lightDarkClick(event) {
+  lightMode = !lightMode;
+
+  document.getElementById("runtimepy")
+      .setAttribute("data-bs-theme", lightMode ? "light" : "dark");
+
+  window.location.hash = lightMode ? "#light-mode" : "";
+}
+
+let lightDarkButton = document.getElementById("theme-button");
+if (lightDarkButton) {
+  lightDarkButton.addEventListener("click", lightDarkClick);
+}
+
+if (window.location.hash) {
+  let parts = window.location.hash.slice(1).split(",");
+
+  if (parts.includes("light-mode")) {
+    lightDarkButton.click();
+  }
+}
diff --git a/runtimepy/net/html/__init__.py b/runtimepy/net/html/__init__.py
new file mode 100644
index 00000000..7bb21bc5
--- /dev/null
+++ b/runtimepy/net/html/__init__.py
@@ -0,0 +1,163 @@
+"""
+A module implementing HTML-related interfaces.
+"""
+
+# built-in
+from io import StringIO
+from typing import Optional
+
+# third-party
+from svgen.element import Element
+from svgen.element.html import Html, div
+from vcorelib import DEFAULT_ENCODING
+from vcorelib.io import IndentedFileWriter
+from vcorelib.paths import find_file
+
+# internal
+from runtimepy import PKG_NAME
+from runtimepy.net.html.bootstrap import (
+    add_bootstrap_css,
+    add_bootstrap_js,
+    icon_str,
+)
+from runtimepy.net.html.bootstrap.elements import (
+    bootstrap_button,
+    centered_markdown,
+)
+
+
+def create_app_shell(parent: Element, **kwargs) -> tuple[Element, Element]:
+    """Create a bootstrap-based application shell."""
+
+    container = div(parent=parent, **kwargs)
+    container.add_class("d-flex", "align-items-start", "bg-body")
+
+    # Dark theme.
+    container["data-bs-theme"] = "dark"
+
+    # Buttons.
+    button_column = div(parent=container)
+    button_column.add_class("d-flex", "flex-column", "h-100", "bg-dark-subtle")
+
+    # Dark/light theme switch button.
+    bootstrap_button(
+        icon_str("lightbulb"),
+        tooltip=" Toggle light/dark.",
+        id="theme-button",
+        parent=button_column,
+    )
+
+    return container, button_column
+
+
+def markdown_page(parent: Element, markdown: str, **kwargs) -> None:
+    """Compose a landing page."""
+
+    container = centered_markdown(
+        create_app_shell(parent, **kwargs)[0], markdown, "h-100", "text-body"
+    )
+    container.add_class("overflow-y-auto")
+
+
+def common_css(document: Html) -> None:
+    """Add common CSS to an HTML document."""
+
+    append_kind(document.head, "font", kind="css", tag="style")
+    add_bootstrap_css(document.head)
+    append_kind(
+        document.head, "main", "bootstrap_extra", kind="css", tag="style"
+    )
+
+
+def full_markdown_page(document: Html, markdown: str) -> None:
+    """Render a full markdown HTML app."""
+
+    common_css(document)
+    markdown_page(document.body, markdown, id=PKG_NAME)
+
+    # JavaScript.
+    append_kind(document.body, "markdown_page")
+    add_bootstrap_js(document.body)
+
+
+def handle_worker(writer: IndentedFileWriter) -> int:
+    """Boilerplate contents for worker thread block."""
+
+    # Not currently used.
+    # return write_found_file(
+    #     writer, kind_url("js", "webgl-debug", subdir="third-party")
+    # )
+    del writer
+
+    return 0
+
+
+def write_found_file(writer: IndentedFileWriter, *args, **kwargs) -> bool:
+    """Write a file's contents to the file-writer's stream."""
+
+    result = False
+
+    entry = find_file(*args, **kwargs)
+    if entry is not None:
+        with entry.open(encoding=DEFAULT_ENCODING) as path_fd:
+            for line in path_fd:
+                writer.write(line)
+
+        result = True
+
+    return result
+
+
+def kind_url(
+    kind: str, name: str, subdir: str = None, package: str = PKG_NAME
+) -> str:
+    """Return a URL to find a package resource."""
+
+    path = kind
+
+    if subdir is not None:
+        path += "/" + subdir
+
+    path += f"/{name}"
+
+    return f"package://{package}/{path}.{kind}"
+
+
+WORKER_TYPE = "text/js-worker"
+
+
+def append_kind(
+    element: Element,
+    *names: str,
+    package: str = PKG_NAME,
+    kind: str = "js",
+    tag: str = "script",
+    subdir: str = None,
+    worker: bool = False,
+) -> Optional[Element]:
+    """Append a new script element."""
+
+    elem = Element(tag=tag, allow_no_end_tag=False)
+
+    with StringIO() as stream:
+        writer = IndentedFileWriter(stream, per_indent=2)
+        found_count = 0
+        for name in names:
+            if write_found_file(
+                writer, kind_url(kind, name, subdir=subdir, package=package)
+            ):
+                found_count += 1
+
+        if worker:
+            found_count += handle_worker(writer)
+
+        if found_count:
+            elem.text = stream.getvalue()
+
+    if found_count:
+        element.children.append(elem)
+
+    if worker:
+        elem["type"] = WORKER_TYPE
+
+    return elem if found_count else None
diff --git a/runtimepy/net/server/app/bootstrap/__init__.py b/runtimepy/net/html/bootstrap/__init__.py
similarity index 100%
rename from runtimepy/net/server/app/bootstrap/__init__.py
rename to runtimepy/net/html/bootstrap/__init__.py
diff --git a/runtimepy/net/server/app/bootstrap/elements.py b/runtimepy/net/html/bootstrap/elements.py
similarity index 98%
rename from runtimepy/net/server/app/bootstrap/elements.py
rename to runtimepy/net/html/bootstrap/elements.py
index dc5a209c..4025611e 100644
--- a/runtimepy/net/server/app/bootstrap/elements.py
+++ b/runtimepy/net/html/bootstrap/elements.py
@@ -12,7 +12,7 @@
 from vcorelib.io.file_writer import IndentedFileWriter
 
 # internal
-from runtimepy.net.server.app.bootstrap import icon_str
+from runtimepy.net.html.bootstrap import icon_str
 
 TEXT = "font-monospace"
 BOOTSTRAP_BUTTON = f"rounded-0 {TEXT} button-bodge text-nowrap"
@@ -167,7 +167,7 @@ def slider(
 
 def centered_markdown(
     parent: Element, markdown: str, *container_classes: str
-) -> None:
+) -> Element:
     """Add centered markdown."""
 
     container = div(parent=parent)
@@ -198,3 +198,5 @@ def centered_markdown(
     div(parent=horiz_container)
 
     div(parent=container)
+
+    return container
diff --git a/runtimepy/net/server/app/bootstrap/tabs.py b/runtimepy/net/html/bootstrap/tabs.py
similarity index 82%
rename from runtimepy/net/server/app/bootstrap/tabs.py
rename to runtimepy/net/html/bootstrap/tabs.py
index 5f934d38..cea1d4a1 100644
--- a/runtimepy/net/server/app/bootstrap/tabs.py
+++ b/runtimepy/net/html/bootstrap/tabs.py
@@ -8,10 +8,9 @@
 
 # internal
 from runtimepy import PKG_NAME
-from runtimepy.net.server.app.bootstrap import icon_str
-from runtimepy.net.server.app.bootstrap.elements import (
+from runtimepy.net.html import create_app_shell
+from runtimepy.net.html.bootstrap.elements import (
     BOOTSTRAP_BUTTON,
-    bootstrap_button,
     collapse_button,
     flex,
     toggle_button,
@@ -84,27 +83,7 @@ def __init__(self, name: str, parent: Element) -> None:
         """Initialize this instance."""
 
         self.name = name
-
-        # Create application container.
-        self.container = div(parent=parent, id=name)
-        self.container.add_class("d-flex", "align-items-start", "bg-body")
-
-        # Dark theme.
-        self.container["data-bs-theme"] = "dark"
-
-        # Buttons.
-        self.button_column = div(parent=self.container)
-        self.button_column.add_class(
-            "d-flex", "flex-column", "h-100", "bg-dark-subtle"
-        )
-
-        # Dark/light theme switch button.
-        bootstrap_button(
-            icon_str("lightbulb"),
-            tooltip=" Toggle light/dark.",
-            id="theme-button",
-            parent=self.button_column,
-        )
+        self.container, self.button_column = create_app_shell(parent, id=name)
 
         # Toggle tabs button.
         self.add_button("Toggle tabs", f"#{PKG_NAME}-tabs", id="tabs-button")
diff --git a/runtimepy/net/server/__init__.py b/runtimepy/net/server/__init__.py
index 81a5d9af..2ce9e778 100644
--- a/runtimepy/net/server/__init__.py
+++ b/runtimepy/net/server/__init__.py
@@ -11,16 +11,19 @@
 from typing import Any, Optional, TextIO, Union
 
 # third-party
-from vcorelib.io import JsonObject
+import aiofiles
+from vcorelib import DEFAULT_ENCODING
+from vcorelib.io import IndentedFileWriter, JsonObject
 from vcorelib.paths import Pathlike, find_file, normalize
 
 # internal
 from runtimepy import DEFAULT_EXT, PKG_NAME
 from runtimepy.channel.environment.command import GLOBAL
+from runtimepy.net.html import full_markdown_page
 from runtimepy.net.http.header import RequestHeader
 from runtimepy.net.http.request_target import PathMaybeQuery
 from runtimepy.net.http.response import ResponseHeader
-from runtimepy.net.server.html import HtmlApp, HtmlApps, html_handler
+from runtimepy.net.server.html import HtmlApp, HtmlApps, get_html, html_handler
 from runtimepy.net.server.json import encode_json, json_handler
 from runtimepy.net.tcp.http import HttpConnection
 from runtimepy.util import normalize_root, path_has_part
@@ -106,7 +109,7 @@ def init(self) -> None:
                 with favicon.open("rb") as favicon_fd:
                     type(self).favicon_data = favicon_fd.read()
 
-    def try_redirect(
+    async def try_redirect(
         self, path: PathMaybeQuery, response: ResponseHeader
     ) -> Optional[bytes]:
         """Try handling any HTTP redirect rules."""
@@ -123,7 +126,26 @@ def try_redirect(
 
         return result
 
-    def try_file(
+    async def render_markdown(
+        self, path: Path, response: ResponseHeader, **kwargs
+    ) -> bytes:
+        """Render a markdown file as HTML and return the result."""
+
+        document = get_html()
+
+        async with aiofiles.open(path, mode="r") as path_fd:
+            with IndentedFileWriter.string() as writer:
+                writer.write_markdown(await path_fd.read(), **kwargs)
+                full_markdown_page(
+                    document,
+                    writer.stream.getvalue(),  # type: ignore
+                )
+
+        response["Content-Type"] = f"text/html; charset={DEFAULT_ENCODING}"
+
+        return document.encode_str().encode()
+
+    async def try_file(
         self, path: PathMaybeQuery, response: ResponseHeader
     ) -> Optional[bytes]:
         """Try serving this path as a file directly from the file-system."""
@@ -133,6 +155,12 @@ def try_file(
         # Try serving the path as a file.
         for search in self.paths:
             candidate = search.joinpath(path[0][1:])
+
+            # Handle markdown sources.
+            md_candidate = candidate.with_suffix(".md")
+            if md_candidate.is_file():
+                return await self.render_markdown(md_candidate, response)
+
             if candidate.is_file():
                 mime, encoding = mimetypes.guess_type(candidate, strict=False)
 
@@ -146,8 +174,8 @@ def try_file(
                 self.logger.info("Serving '%s' (MIME: %s)", candidate, mime)
 
                 # Return the file data.
-                with candidate.open("rb") as path_fd:
-                    result = path_fd.read()
+                async with aiofiles.open(candidate, mode="rb") as path_fd:
+                    result = await path_fd.read()
 
                 break
 
@@ -223,7 +251,9 @@ async def get_handler(
 
                 # Try serving a file and handling redirects.
                 for handler in [self.try_redirect, self.try_file]:
-                    result = handler(request.target.origin_form, response)
+                    result = await handler(
+                        request.target.origin_form, response
+                    )
                     if result is not None:
                         return result
 
diff --git a/runtimepy/net/server/app/base.py b/runtimepy/net/server/app/base.py
index 8f9195d3..17ae34ab 100644
--- a/runtimepy/net/server/app/base.py
+++ b/runtimepy/net/server/app/base.py
@@ -11,12 +11,9 @@
 # internal
 from runtimepy import PKG_NAME
 from runtimepy.net.arbiter.info import AppInfo
-from runtimepy.net.server.app.bootstrap import (
-    add_bootstrap_css,
-    add_bootstrap_js,
-)
-from runtimepy.net.server.app.bootstrap.tabs import TabbedContent
-from runtimepy.net.server.app.files import append_kind
+from runtimepy.net.html import append_kind, common_css
+from runtimepy.net.html.bootstrap import add_bootstrap_js
+from runtimepy.net.html.bootstrap.tabs import TabbedContent
 
 TabPopulater = Callable[[TabbedContent], None]
 
@@ -53,11 +50,7 @@ def populate(self, document: Html, app: TabPopulater) -> None:
         """Populate the body element with the application."""
 
         # CSS.
-        append_kind(document.head, "font", kind="css", tag="style")
-        add_bootstrap_css(document.head)
-        append_kind(
-            document.head, "main", "bootstrap_extra", kind="css", tag="style"
-        )
+        common_css(document)
 
         # Worker code.
         append_kind(
diff --git a/runtimepy/net/server/app/create.py b/runtimepy/net/server/app/create.py
index 7d652bed..fde6c6a3 100644
--- a/runtimepy/net/server/app/create.py
+++ b/runtimepy/net/server/app/create.py
@@ -11,10 +11,10 @@
 
 # internal
 from runtimepy.net.arbiter.info import AppInfo
+from runtimepy.net.html.bootstrap.tabs import TabbedContent
 from runtimepy.net.http.header import RequestHeader
 from runtimepy.net.http.response import ResponseHeader
 from runtimepy.net.server.app.base import WebApplication
-from runtimepy.net.server.app.bootstrap.tabs import TabbedContent
 from runtimepy.net.server.html import HtmlApp
 
 DOCUMENTS: dict[str, Html] = {}
diff --git a/runtimepy/net/server/app/env/__init__.py b/runtimepy/net/server/app/env/__init__.py
index b1fe1fec..e619e794 100644
--- a/runtimepy/net/server/app/env/__init__.py
+++ b/runtimepy/net/server/app/env/__init__.py
@@ -8,11 +8,8 @@
 # internal
 from runtimepy import PKG_NAME
 from runtimepy.net.arbiter.info import AppInfo
-from runtimepy.net.server.app.bootstrap.elements import (
-    centered_markdown,
-    input_box,
-)
-from runtimepy.net.server.app.bootstrap.tabs import TabbedContent
+from runtimepy.net.html.bootstrap.elements import centered_markdown, input_box
+from runtimepy.net.html.bootstrap.tabs import TabbedContent
 from runtimepy.net.server.app.env.modal import Modal
 from runtimepy.net.server.app.env.settings import plot_settings
 from runtimepy.net.server.app.env.tab import ChannelEnvironmentTab
diff --git a/runtimepy/net/server/app/env/modal.py b/runtimepy/net/server/app/env/modal.py
index d986e9f8..c8946660 100644
--- a/runtimepy/net/server/app/env/modal.py
+++ b/runtimepy/net/server/app/env/modal.py
@@ -7,8 +7,8 @@
 
 # internal
 from runtimepy import PKG_NAME
-from runtimepy.net.server.app.bootstrap.elements import TEXT
-from runtimepy.net.server.app.bootstrap.tabs import TabbedContent
+from runtimepy.net.html.bootstrap.elements import TEXT
+from runtimepy.net.html.bootstrap.tabs import TabbedContent
 
 
 class Modal:
diff --git a/runtimepy/net/server/app/env/settings.py b/runtimepy/net/server/app/env/settings.py
index 0e0e4e99..24c162ad 100644
--- a/runtimepy/net/server/app/env/settings.py
+++ b/runtimepy/net/server/app/env/settings.py
@@ -6,8 +6,8 @@
 from svgen.element.html import div
 
 # internal
-from runtimepy.net.server.app.bootstrap.elements import flex, slider
-from runtimepy.net.server.app.bootstrap.tabs import TabbedContent
+from runtimepy.net.html.bootstrap.elements import flex, slider
+from runtimepy.net.html.bootstrap.tabs import TabbedContent
 from runtimepy.net.server.app.env.modal import Modal
 from runtimepy.net.server.app.placeholder import under_construction
 
diff --git a/runtimepy/net/server/app/env/tab/base.py b/runtimepy/net/server/app/env/tab/base.py
index 833ba794..7affe1ba 100644
--- a/runtimepy/net/server/app/env/tab/base.py
+++ b/runtimepy/net/server/app/env/tab/base.py
@@ -13,7 +13,7 @@
     ChannelCommandProcessor,
 )
 from runtimepy.net.arbiter.info import AppInfo
-from runtimepy.net.server.app.bootstrap.tabs import TabbedContent
+from runtimepy.net.html.bootstrap.tabs import TabbedContent
 from runtimepy.net.server.app.tab import Tab
 
 
diff --git a/runtimepy/net/server/app/env/tab/controls.py b/runtimepy/net/server/app/env/tab/controls.py
index 2216168b..e8f645ef 100644
--- a/runtimepy/net/server/app/env/tab/controls.py
+++ b/runtimepy/net/server/app/env/tab/controls.py
@@ -13,7 +13,7 @@
 from runtimepy.channel import AnyChannel
 from runtimepy.channel.environment import ChannelEnvironment
 from runtimepy.enum import RuntimeEnum
-from runtimepy.net.server.app.bootstrap.elements import slider, toggle_button
+from runtimepy.net.html.bootstrap.elements import slider, toggle_button
 from runtimepy.net.server.app.env.tab.base import ChannelEnvironmentTabBase
 from runtimepy.net.server.app.env.widgets import (
     TABLE_BUTTON_CLASSES,
diff --git a/runtimepy/net/server/app/env/tab/html.py b/runtimepy/net/server/app/env/tab/html.py
index e4f5ce31..9f3764b1 100644
--- a/runtimepy/net/server/app/env/tab/html.py
+++ b/runtimepy/net/server/app/env/tab/html.py
@@ -12,7 +12,7 @@
 # internal
 from runtimepy.channel import AnyChannel
 from runtimepy.enum import RuntimeEnum
-from runtimepy.net.server.app.bootstrap.elements import (
+from runtimepy.net.html.bootstrap.elements import (
     TEXT,
     centered_markdown,
     flex,
diff --git a/runtimepy/net/server/app/env/widgets.py b/runtimepy/net/server/app/env/widgets.py
index 6617c6b2..47aac2a0 100644
--- a/runtimepy/net/server/app/env/widgets.py
+++ b/runtimepy/net/server/app/env/widgets.py
@@ -14,7 +14,7 @@
     ChannelCommandProcessor,
 )
 from runtimepy.enum import RuntimeEnum
-from runtimepy.net.server.app.bootstrap.elements import (
+from runtimepy.net.html.bootstrap.elements import (
     flex,
     input_box,
     set_tooltip,
diff --git a/runtimepy/net/server/app/files.py b/runtimepy/net/server/app/files.py
index f294017f..6a020397 100644
--- a/runtimepy/net/server/app/files.py
+++ b/runtimepy/net/server/app/files.py
@@ -4,32 +4,14 @@
 
 # built-in
 from io import StringIO
-from typing import Optional
 
 # third-party
 from svgen.element import Element
-from vcorelib import DEFAULT_ENCODING
 from vcorelib.io import IndentedFileWriter
-from vcorelib.paths import find_file
 
 # internal
 from runtimepy import PKG_NAME
-
-
-def write_found_file(writer: IndentedFileWriter, *args, **kwargs) -> bool:
-    """Write a file's contents to the file-writer's stream."""
-
-    result = False
-
-    entry = find_file(*args, **kwargs)
-    if entry is not None:
-        with entry.open(encoding=DEFAULT_ENCODING) as path_fd:
-            for line in path_fd:
-                writer.write(line)
-
-        result = True
-
-    return result
+from runtimepy.net.html import kind_url, write_found_file
 
 
 def set_text_to_file(element: Element, *args, **kwargs) -> bool:
@@ -45,21 +27,6 @@ def set_text_to_file(element: Element, *args, **kwargs) -> bool:
     return result
 
 
-def kind_url(
-    kind: str, name: str, subdir: str = None, package: str = PKG_NAME
-) -> str:
-    """Return a URL to find a package resource."""
-
-    path = kind
-
-    if subdir is not None:
-        path += "/" + subdir
-
-    path += f"/{name}"
-
-    return f"package://{package}/{path}.{kind}"
-
-
 def set_text_to_kind(
     element: Element,
     kind: str,
@@ -72,55 +39,3 @@ def set_text_to_kind(
     return set_text_to_file(
         element, kind_url(kind, name, subdir=subdir, package=package)
     )
-
-
-WORKER_TYPE = "text/js-worker"
-
-
-def handle_worker(writer: IndentedFileWriter) -> int:
-    """Boilerplate contents for worker thread block."""
-
-    # Not currently used.
-    # return write_found_file(
-    #     writer, kind_url("js", "webgl-debug", subdir="third-party")
-    # )
-    del writer
-
-    return 0
-
-
-def append_kind(
-    element: Element,
-    *names: str,
-    package: str = PKG_NAME,
-    kind: str = "js",
-    tag: str = "script",
-    subdir: str = None,
-    worker: bool = False,
-) -> Optional[Element]:
-    """Append a new script element."""
-
-    elem = Element(tag=tag, allow_no_end_tag=False)
-
-    with StringIO() as stream:
-        writer = IndentedFileWriter(stream, per_indent=2)
-        found_count = 0
-        for name in names:
-            if write_found_file(
-                writer, kind_url(kind, name, subdir=subdir, package=package)
-            ):
-                found_count += 1
-
-        if worker:
-            found_count += handle_worker(writer)
-
-        if found_count:
-            elem.text = stream.getvalue()
-
-    if found_count:
-        element.children.append(elem)
-
-    if worker:
-        elem["type"] = WORKER_TYPE
-
-    return elem if found_count else None
diff --git a/runtimepy/net/server/app/landing_page.py b/runtimepy/net/server/app/landing_page.py
index 1ec05483..0f2e781f 100644
--- a/runtimepy/net/server/app/landing_page.py
+++ b/runtimepy/net/server/app/landing_page.py
@@ -10,6 +10,7 @@
 
 # internal
 from runtimepy.net.arbiter.info import AppInfo
+from runtimepy.net.html import full_markdown_page
 from runtimepy.net.http.header import RequestHeader
 from runtimepy.net.http.response import ResponseHeader
 
@@ -28,6 +29,11 @@ def landing_page(
     del response
     del request_data
 
-    print(app)
+    full_markdown_page(
+        document,
+        app.config_param("landing_page", {}, strict=True).get(  # type: ignore
+            "markdown", "no data"
+        ),
+    )
 
     return document
diff --git a/runtimepy/net/server/app/placeholder.py b/runtimepy/net/server/app/placeholder.py
index 2c08b28a..7c316f78 100644
--- a/runtimepy/net/server/app/placeholder.py
+++ b/runtimepy/net/server/app/placeholder.py
@@ -8,8 +8,8 @@
 
 # internal
 from runtimepy.net.arbiter.info import AppInfo
-from runtimepy.net.server.app.bootstrap import icon_str
-from runtimepy.net.server.app.bootstrap.tabs import TabbedContent
+from runtimepy.net.html.bootstrap import icon_str
+from runtimepy.net.html.bootstrap.tabs import TabbedContent
 from runtimepy.net.server.app.tab import Tab
 
 
diff --git a/runtimepy/net/server/app/sound.py b/runtimepy/net/server/app/sound.py
index ab2e8c30..be26619e 100644
--- a/runtimepy/net/server/app/sound.py
+++ b/runtimepy/net/server/app/sound.py
@@ -7,7 +7,7 @@
 from svgen.element.html import div
 
 # built-in
-from runtimepy.net.server.app.bootstrap.elements import bootstrap_button
+from runtimepy.net.html.bootstrap.elements import bootstrap_button
 from runtimepy.net.server.app.tab import Tab
 
 
diff --git a/runtimepy/net/server/app/tab.py b/runtimepy/net/server/app/tab.py
index b36d4632..55d7f82d 100644
--- a/runtimepy/net/server/app/tab.py
+++ b/runtimepy/net/server/app/tab.py
@@ -13,9 +13,9 @@
 
 # internal
 from runtimepy.net.arbiter.info import AppInfo
-from runtimepy.net.server.app.bootstrap import icon_str
-from runtimepy.net.server.app.bootstrap.tabs import TabbedContent
-from runtimepy.net.server.app.files import kind_url, write_found_file
+from runtimepy.net.html import kind_url, write_found_file
+from runtimepy.net.html.bootstrap import icon_str
+from runtimepy.net.html.bootstrap.tabs import TabbedContent
 
 
 class Tab:
diff --git a/runtimepy/net/server/html.py b/runtimepy/net/server/html.py
index 216e4f0d..597335bd 100644
--- a/runtimepy/net/server/html.py
+++ b/runtimepy/net/server/html.py
@@ -20,6 +20,12 @@
 HtmlApps = dict[str, HtmlApp]
 
 
+def get_html() -> Html:
+    """Get a default HTML document."""
+
+    return Html(HttpConnection.identity)
+
+
 async def html_handler(
     apps: HtmlApps,
     stream: TextIO,
@@ -36,8 +42,4 @@ async def html_handler(
     # Create the application.
     app = apps.get(request.target.path, default_app)
     if app is not None:
-        (
-            await app(
-                Html(HttpConnection.identity), request, response, request_data
-            )
-        ).render(stream)
+        (await app(get_html(), request, response, request_data)).render(stream)
diff --git a/tasks/dev.yaml b/tasks/dev.yaml
index 8863442e..a9517bc8 100644
--- a/tasks/dev.yaml
+++ b/tasks/dev.yaml
@@ -3,6 +3,7 @@ includes:
   - package://runtimepy/server.yaml
   - dev_no_wait.yaml
   - ../tests/data/valid/connection_arbiter/test_ssl.yaml
+  - ../tests/data/valid/connection_arbiter/landing_page.yaml
 
 port_overrides:
   runtimepy_https_server: 8443
diff --git a/tests/data/valid/connection_arbiter/landing_page.yaml b/tests/data/valid/connection_arbiter/landing_page.yaml
new file mode 100644
index 00000000..e1bad50d
--- /dev/null
+++ b/tests/data/valid/connection_arbiter/landing_page.yaml
@@ -0,0 +1,10 @@
+---
+config:
+
+  # Additional web applications.
+  landing_page:
+    paths: [/landing_page.html]
+    markdown: |
+      # Sample Markdown
+
+      Sample content.
diff --git a/tests/data/valid/connection_arbiter/runtimepy_http.yaml b/tests/data/valid/connection_arbiter/runtimepy_http.yaml
index 88324842..29ae4508 100644
--- a/tests/data/valid/connection_arbiter/runtimepy_http.yaml
+++ b/tests/data/valid/connection_arbiter/runtimepy_http.yaml
@@ -3,6 +3,7 @@ includes_left:
   - package://runtimepy/server.yaml
 includes:
   - test_ssl.yaml
+  - landing_page.yaml
 
 app:
   - tests.net.stream.runtimepy_http_test
@@ -18,10 +19,6 @@ config:
   foo: bar
   xdg_fragment: "wave1,hide-tabs,hide-channels/wave1:sin,cos"
 
-  # Additional web applications.
-  landing_page:
-    paths: [/landing_page.html]
-
 ports:
   - {name: tftp_server, type: udp}
 
diff --git a/tests/net/server/__init__.py b/tests/net/server/__init__.py
index 0953294b..2e2d090f 100644
--- a/tests/net/server/__init__.py
+++ b/tests/net/server/__init__.py
@@ -71,6 +71,7 @@ async def runtimepy_http_client_server(
             client.request(RequestHeader(target="/index.html")),
             client.request(RequestHeader(target="/test_json.html")),
             client.request(RequestHeader(target="/landing_page.html")),
+            client.request(RequestHeader(target="/README.md")),
             # Files from file-system.
             client.request(RequestHeader(target="/sample.json")),
             client.request(RequestHeader(target="/manifest.yaml")),
diff --git a/tests/net/server/app/test_files.py b/tests/net/server/app/test_files.py
index a88abbbf..84f524fe 100644
--- a/tests/net/server/app/test_files.py
+++ b/tests/net/server/app/test_files.py
@@ -7,7 +7,8 @@
 
 # module under test
 from runtimepy import PKG_NAME
-from runtimepy.net.server.app.files import kind_url, set_text_to_file
+from runtimepy.net.html import kind_url
+from runtimepy.net.server.app.files import set_text_to_file
 
 
 def test_set_text_to_file_basic():