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<!DOCTYPE html>
<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>