diff --git a/components/page.js b/components/page.js
index 217dcf7..e3c141a 100644
--- a/components/page.js
+++ b/components/page.js
@@ -1,3 +1,32 @@
+const frameHtml = `<!doctype html>
+<html>
+  <head>
+    <title>Frame</title>
+    <style>
+      html, body, iframe {
+        margin: 0;
+        padding: 0;
+        width: 100%;
+        height: 100%;
+      }
+    </style>
+  </head>
+  <body>
+    <iframe srcdoc="" sandbox="allow-scripts"></iframe>
+    <script type="module">
+const frame = document.getElementsByTagName('iframe')[0]
+addEventListener('message', event => {
+  const d = event.data
+  if (Array.isArray(d) && d[0] === 'srcdoc') {
+    frame.srcdoc = d
+  } else {
+    frame.postMessage(event.data)
+  }
+}
+    </script>
+  </body>
+</html>`
+
 export class Page extends HTMLElement {
   constructor() {
     super()
@@ -31,5 +60,31 @@ export class Page extends HTMLElement {
       }
     `
     this.shadowRoot.append(style)
+    if (path.startsWith('/sandbox/')) {
+      this.initFrame()
+    }
+  }
+
+  initFrame() {
+    const tmp = document.createElement('iframe')
+    tmp.sandbox = "allow-same-origin allow-scripts"
+    const url = new URL(
+      '/-/frame', location.href
+    )
+    url.searchParams.set(
+      'csp',
+      "default-src 'self'"
+    )
+    url.searchParams.set('html', frameHtml)
+    tmp.src = url.href
+    this.shadowRoot.insertAdjacentHTML(
+      'beforeend', tmp.outerHTML
+    )
+    const frames = this.shadowRoot.getElementsByTagName('iframe')
+    this.frame = frames[frames.length - 1]
+    this.textArea.addEventListener('blur', e => {
+      const msg = ['srcdoc', e.target.value]
+this.frame.contentWindow.postMessage(msg)
+    })
   }
 }
\ No newline at end of file
