modernizr/feature-detects/geolocation.js

Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.

/*!
{
  "name": "Geolocation API",
  "property": "geolocation",
  "caniuse": "geolocation",
  "tags": ["media"],
  "notes": [{
    "name": "MDN documentation",
    "href": "https://developer.mozilla.org/en-US/docs/WebAPI/Using_geolocation"
  }],
  "polyfills": [
    "joshuabell-polyfill",
    "webshims",
    "geo-location-javascript",
    "geolocation-api-polyfill"
  ]
}
!*/
/* DOC
Detects support for the Geolocation API for users to provide their location to web applications.
*/
define(['Modernizr'], function(Modernizr) {
  // geolocation is often considered a trivial feature detect...
  // Turns out, it's quite tricky to get right:
  //
  // Using !!navigator.geolocation does two things we don't want. It:
  //   1. Leaks memory in IE9: github.com/Modernizr/Modernizr/issues/513
  //   2. Disables page caching in WebKit: webk.it/43956
  //
  // Meanwhile, in Firefox < 8, an about:config setting could expose
  // a false positive that would throw an exception: bugzil.la/688158

  Modernizr.addTest('geolocation', 'geolocation' in navigator);
});