upstream-tanstack-query/examples/lit/basic/mutation.html

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<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Lit Query Mutation Example</title>
  </head>
  <body>
    <mutation-example-root></mutation-example-root>
    <script type="module" src="/src/mutation.ts"></script>
  </body>
</html>