.alert.is-critical
  :marked
    The current beta.11 release has known bugs relating to
    significant changes to the  _zones_ subsystem.
    All apps will report an error to the console:<br>
    <span style="color:red; font-family:Lucida Console;">
    Uncaught TypeError: Cannot read property 'zone' of undefined</span><br>
    The app will run unimpeded but it is disconcerting.
    We hope to have this and other bugs repaired by beta.12.
    Thanks for your patience.
    
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