Perfect, worked, thank you! Noting nesting of single inside double quotes, amended code is:
<a data-ex-href-subcontent="https://twitter.com/{{.label}}"; target="_blank" data-ex-content="concat('@', .label)"></a> -- You received this message because you are subscribed to the Google Groups "SIMILE Widgets" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/simile-widgets. For more options, visit https://groups.google.com/d/optout.
