diff --git a/index.js b/index.js
index eeb8346..26b506a 100644
--- a/index.js
+++ b/index.js
@@ -6,6 +6,10 @@ console.log('Loaded by JSON import', tsconfig)
 document.body.appendChild(document.createElement('div')).appendChild(article)
 document.adoptedStyleSheets = [css]
 
-navigator.serviceWorker.register('./service-worker.js', {}).then(sw => {
-    console.log('Service worker registered!')
-})
+navigator.serviceWorker
+    .register('./service-worker.js', {
+        // DOMException: "type 'module' in RegistrationOptions is not implemented yet.
+        // See https://crbug.com/824647 for details."
+        // type: 'module'
+    })
+    .then(sw => console.log('Service worker registered!'), e => console.error((window.e = e)))
diff --git a/service-worker.js b/service-worker.js
index 6c5ab42..784c2da 100644
--- a/service-worker.js
+++ b/service-worker.js
@@ -51,3 +51,14 @@ export default container`
 Loader.add(
     new Loader('/json-module-loader.js', async res => `export default JSON.parse(${JSON.stringify(await res.text())})`)
 )
+globalThis.window = globalThis
+importScripts('https://unpkg.com/marked@0.7.0/marked.min.js')
+
+Loader.add(
+    new Loader(
+        '/markdown-loader.js',
+        async res => `const container = document.createElement('p')
+container.innerHTML = ${JSON.stringify(marked(await res.text()))}
+export default container`
+    )
+)