arozwalak
11/14/2013 - 3:40 PM

Javascript: Feature detection

Javascript: Feature detection

index.html
content_copyfile_download
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Feature Detection</title>
</head>
<body>
  <input type="text" placeholder="John Doe">
  <input type="email">
  <script>
    if (!'placeholder' in document.createElement('input')) {
      // a polyfill
      
    }
    
    function testSupport (type) {
      var i = document.createElement('input');
      i.setAttribute('type', type);
      return i.type === type;  
    }
    
    if ( !testSupport('email')) {
      // provide fallback
    }
    
    if (document.createElement('canvas').getContext) {
      // browser supports canvas
    }
    
    if (document.createElement('audio').canPlayType) {
      // browser supports audio
    }
    
    if (document.createElement('video').canPlayType) {
      // browser supports video
    }
    
    function supportsStorage() {
      try {
        return 'localStorage' in window && window.localStorage !== null;
      } catch(e) {
        return false;
      }  
    }
    
    if (!!navigator.geolocation) alert('track me!');
    
  </script>
</body>
</html>