I've found solution in older topic https://groups.google.com/d/topic/google-visualization-api/dbYfjWSrDEY/discussion
Google Code Playground uses linechart. Switching example to corechart has fixed the issue and case is closed. -- You received this message because you are subscribed to the Google Groups "Google Visualization API" 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/google-visualization-api?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
