page.html

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <meta name="color-scheme" content="light dark" />
    <title>Page CSS</title>
    <meta property="og:title" content="Page CSS" />
    <meta property="og:type" content="website" />
    <meta name="twitter:card" content="summary" />
    <style>
      /* Pagez's theme.css */
    </style>
  </head>
  <body>
    <main>
<style>
  h1 {
    color: teal;
  }
</style>
<p class="note">Raw HTML beside the first style, which stays in the body.</p>
<h1 id="page-css">Page CSS</h1>
<p>Prose between the two blocks.</p>
<style>
  .note {
    font-style: italic;
  }
</style>
</main>
  </body>
</html>