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Javascript: Feature detection
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| <!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> |
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