Many thanks to @stlehmann! This feature is now available in dash==1.14.0 (📣 Dash v1.14.0 Released - Update the Tab's Title, Removing the "Updating..." Messages, Updated DataTable Link Behavior) and is documented in http://dash.plotly.com/external-resources. Look for the title= and update_title= . See the “Customizing Dash’s Document or Browser Tab Title”, " Update the Document Title Dynamically based off of the URL or Tab", and “Customizing or Removing Dash’s “Updating…” Message” sections.
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