packages/react-devtools-shell/index.html

<!doctype html>
<html>
  <head>
    <meta charset="utf8">
    <title>React DevTools</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <style>
      #target {
        flex: 1;
        border: none;
      }
      #devtools {
        height: 400px;
        max-height: 50%;
        overflow: hidden;
        z-index: 10000001;
      }
      body {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        margin: 0;
        padding: 0;
        font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Helvetica, Arial,
          sans-serif, Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol;
        font-size: 12px;
        line-height: 1.5;
      }
      .optionsRow {
        width: 100%;
        display: flex;
        padding: 0.25rem;
        background: aliceblue;
        border-bottom: 1px solid lightblue;
        box-sizing: border-box;
      }
      .optionsRowSpacer {
        flex: 1;
      }
    </style>
  </head>
  <body>
    <div class="optionsRow">
      <button id="mountButton">Unmount test app</button>
      <div class="optionsRowSpacer">&nbsp;</div>
      <span>
        <a href="/multi.html">multi DevTools</a>
        |
        <a href="/e2e.html">e2e tests</a>
        |
        <a href="/e2e-regression.html">e2e regression tests</a>
        |
        <a href="/perf-regression.html">perf regression tests</a>
      </span>
    </div>

    <!-- React test app (shells/dev/app) is injected here -->
    <!-- DevTools backend (shells/dev/src) is injected here -->
    <!-- global "hook" is defined on the iframe's contentWindow -->
    <iframe id="target"></iframe>

    <!-- DevTools frontend UI (shells/dev/src) renders here -->
    <div id="devtools"></div>

    <!-- This script installs the hook, injects the backend, and renders the DevTools UI -->
    <!-- In DEV mode, this file is served by the Webpack dev server -->
    <!-- For production builds, it's built by Webpack and uploaded from the local file system -->
    <script src="dist/app-devtools.js"></script>
  </body>
</html>