<img src="http://www.gravatar.com/avatar/whatever_id_string_is?s=50&d=identicon" class="quip-avatar" alt="">
This question has been answered by Fildefer57. See the first response.
<li class="[[+cls]]" id="[[+idprefix]][[+id]]" [[+depth_margin:notempty=`style="padding-left: [[+depth_margin]]px"`]]>
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[[+gravatarUrl:notempty=`<img src="[[+gravatarUrl:replace=`http://==//`]]" class="quip-avatar" alt="" />`]]
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<p class="quip-comment-meta">
<span class="quip-comment-author">[[+name]][[- +authorName]]:</span><br />
<span class="quip-comment-createdon"><a href="[[+url]]">[[+createdon]]</a>
[[+approved:if=`[[+approved]]`:is=`1`:then=``:else=`- <em>[[%quip.unapproved? &namespace=`quip` &topic=`default`]]</em>`]]
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<p>[[+body]]</p>
[[+replyUrl:notempty=`<p><span class="quip-reply-link"><a href="[[+replyUrl]]">[[%quip.reply? &namespace=`quip` &topic=`default`]]</a></span></p>`]]
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<div class="quip-comment-options">
[[+report]]
[[+options]]
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[[+children:notempty=`<ol class="quip-comment-list">[[+children]]</ol>`]]
</li>[[+gravatarUrl:notempty=`<img src="[[+gravatarUrl]]" class="quip-avatar" alt="" />`]]
[[+gravatarUrl:notempty=`<img src="[[+gravatarUrl:replace=`http://==//`]]" class="quip-avatar" alt="" />`]]