ext-apps/examples/basic-host/sandbox.html

<!doctype html>
<html>
  <head>
    <meta charset="utf-8" />
    <meta name="color-scheme" content="light dark">
    <!-- CSP is set via HTTP headers by serve.ts (based on ?csp= query param).
         The inner iframe inherits this CSP since we use document.write(). -->
    <title>MCP-UI Proxy</title>
    <style>
      html,
      body {
        margin: 0;
        height: 100vh;
        width: 100vw;
      }
      body {
        display: flex;
        flex-direction: column;
      }
      * {
        box-sizing: border-box;
      }
      iframe {
        background-color: transparent;
        border: 0px none transparent;
        padding: 0px;
        overflow: hidden;
        flex-grow: 1;
      }
    </style>
  </head>
  <body>
    <script type="module" src="/src/sandbox.ts"></script>
  </body>
</html>