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    <title>View bounds of the tilted map</title>
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        <h1>View bounds of the tilted map</h1>
        <p>Synchronise a static map with an interactive map</p>
    <p>This example shows two maps. The upper map allows for panning, zooming, tilting and rotation (to tilt and rotate hold alt key plus left mouse button). 
      The lower map is oriented  top-down north-up, it observes the upper map's <code>lookAt</code> position and visualises the visible area of the interactive map.</p>
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    <h3>Visible area visualisation</h3>
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        The following example creates two objects <code>H.map.Polygon</code> and <code>H.map.Marker</code> that represent the current center and 
        the current view bounds of the interactive map. These objects are updated on every <code>mapviewchange</code> event and are marked as volatile
        at the construction time, that enables the smooth animation of the objects.
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