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chromium/chrome/test/data/extensions/api_test/shared_worker/service_worker_controlled/background.html 

<!--
Copyright 2018 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->

<html><body>
background.html contents for testing.
<script src="background.js"></script>
</body></html>