When creating markers, you need to provide an element optionscontaining title.
Sorry, I don’t have a small working example, but you want your marker object to look something like this:
var marker = {
coords: { latitude: 38.8977, longitude: -77.0366 },
icon: 'images/whitehouse.png',
options: { title: 'The White House' }
id: 12345
};
and then specify all of these property names in the <marker>or directive <markers>.
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