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    <em>This section describes the status of this document at the time of its publication. Other
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    <a href="http://www.w3.org/TR/"><abbr title="World Wide Web Consortium">W3C</abbr> technical
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  <p>
    This document was published by the <a href="https://www.w3.org/WebPlatform/WG/">Web Platform Working Group</a>
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    Feedback and comments on this specification are welcome. Please use
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    Historical discussions can be found in the
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  <p>The Last Call period ends [DEADLINE].</p>
  <p>
    Publication as a Last Call Working Draft does not imply endorsement by the
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  <p>
    This is a Last Call Working Draft and thus the Working Group has determined that this
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  <p>
    This document was produced by a group operating under the
    <a href="http://www.w3.org/Consortium/Patent-Policy/">
    <abbr title="World Wide Web Consortium">W3C</abbr> Patent Policy</a>.
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  <p>
    This document is governed by the <a id="w3c_process_revision" href="https://www.w3.org/2019/Process-20190301/">1 March 2019 W3C Process Document</a>.
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