<span class="gmail_quote"><br></span>I think sarcasm is a good case for "class extensions"<br><br><a href="http://wiki.whatwg.org/wiki/ClassExtensions" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
http://wiki.whatwg.org/wiki/ClassExtensions</a><br><br>That could also apply to other tones of voice where context doesn't make it obvious, such as irony, anger, suspicion, elation, and veiled threats.
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