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The screenshot above shows the type of tooltip I'm referring to, which appears in Chrome and other browsers when hovering over a marker. Yes, this is a browser-originated UI element that presents the content of the "title" attribute for any element in the HTML. My own code is not explictly setting a role:tooltip, so the Google Charts visualization code must itself be inferring this role for the third column that is being returned from the Google Spreadsheet data source. In a Map visualisation, the data format is tightly constrained to three columns (plus a fourth for choosing from predefined named marker styles) - according to the API docs: *"Data Format * * Two alternative data formats are supported:* 1. *Lat-Long pairs - The first two columns should be numbers designating the latitude and longitude, respectively. An optional third column holds a string that describes the location specified in the first two columns."* and: *"To create an additional marker set, add an ID to the icons option and set your marker images. Then, add a column to your Data Table, and set the ID of the marker set you wish to use for each row in the Data Table"* I have previously tried to assign the role:tooltip to a fourth column returned by the JSON from the data source, but this had no effect. Further clues would be most welcome. Cheers Simon -- 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 google-visualization-api+unsubscr...@googlegroups.com. To post to this group, send email to google-visualization-api@googlegroups.com. Visit this group at https://groups.google.com/group/google-visualization-api. To view this discussion on the web visit https://groups.google.com/d/msgid/google-visualization-api/45b6f865-ec9b-490a-8995-8fa9404438bd%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
