text: These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
  Feel free to search this API through the search bar or the navigation tree in the sidebar.
  Sticky tracking of mouse events. When true, the mouseOut
  event on a
  series isn't triggered until the mouse moves over another series, or
  out of the plot area. When false, the mouseOut
  event on a series is
  triggered when the mouse leaves the area around the series' graph or
  markers. This also implies the tooltip when not shared. When
  is false and tooltip.shared
  is false, the tooltip
  will be hidden when moving the mouse between series. Defaults to true
  for line and area type series, but to false for columns, pies etc.
  Note: The boost module will force this option because of technical limitations.