File: counter-list-item-slot-order.html

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<!DOCTYPE html>
<html>
  <head>
    <title>HTML LI element: counter order with Shadow DOM and SLOT</title>
    <link rel="author" title="Martin Robinson" href="mailto:mrobinson@igalia.com">
    <link rel="help" href="https://www.w3.org/TR/css-lists-3/#inheriting-counters">
    <link rel="match" href="counter-list-item-slot-order-ref.html">
    <style>
      li::before { content: counters(list-item,'.') ' '; }
    </style>
  </head>

  <body>
    <div id="host">
      <li slot="list3">Two Point One</li>
      <li slot="list2">Two</li>
      <li slot="list1">One</li>
    </div>

    <script>
      const shadowRoot = document
          .getElementById('host')
          .attachShadow({mode: 'open'});
      shadowRoot.innerHTML = `
          <ol>
            <slot name="list1"></slot>
            <slot name="list2"></slot>
            <ol>
                <slot name="list3"></slot>
            </ol>
          </ol>
        `;
    </script>
  </body>
</html>