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markerDefaults.tooltip.showOn String(default: "mouseenter")

The event on which the tooltip will be shown. Predefined values are "mouseenter", "click" and "focus".

Example - show tooltip on mouse enter

<div id="map"></div>
        layers: [{
            type: "tile",
            urlTemplate: "http://a.tile.openstreetmap.org/#= zoom #/#= x #/#= y #.png",
            attribution: "&copy; OpenStreetMap"
        markerDefaults: {
            tooltip: {
                showOn: "mouseenter",
                content: "Foo"
        markers: [{
            location: [42, 27]
        }, {
            location: [40, 20]
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