Map isn't showing on Google Maps JavaScript API v3 when nested in a div tag -


i'm trying put div tag shows map (<div id="map-canvas"></div>) inside div, doesn't show map way. css or javascript problem? or way api works?

here's code the nested div: 

<!doctype html> <html>   <head>     <title>simple map</title>     <meta name="viewport" content="initial-scale=1.0, user-scalable=no">     <meta charset="utf-8">     <style>         html, body, #map-canvas {             margin: 0;             padding: 0;             height: 100%;         }     </style>     <script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false">     </script>     <script>         var map;         function initialize() {           var mapoptions = {             zoom: 8,             center: new google.maps.latlng(-34.397, 150.644),             maptypeid: google.maps.maptypeid.roadmap           };           map = new google.maps.map(document.getelementbyid('map-canvas'),               mapoptions);         }          google.maps.event.adddomlistener(window, 'load', initialize);     </script> </head> <body>     <div> <!-- ommiting div show map -->         <div id="map-canvas"></div>     </div> </body> </html>

add style="width:100%; height:100%;" div see

not #map_canvas main div

example

<body>     <div style="height:100%; width:100%;">          <div id="map-canvas"></div>     </div> </body>

there other answers on here explain why necessary


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