unifiedToolbarButton.xhtml

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<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml" dir="ltr">

  <head>

    <meta charset="utf-8" />

    <title>Unified toolbar button element test</title>

    <script type="module" src="chrome://messenger/content/unifiedtoolbar/unified-toolbar-button.mjs"></script>

  </head>

  <body>

    <template id="unifiedToolbarButtonTemplate">

      <img class="button-icon" alt="" src="" />

      <span class="button-label"></span>

    </template>

  </body>

</html>