How does java script know what features a specific browser support?

Question

We normally need to check for browser support when we want to use a feature, such as navigator.GeoLocation object.

But exactly where and how do they exist? A physical dll file or completely saved in memory when the browsrr is running? Thanks

Answer 1

You can use following packages

Here : https://modernizr.com/docs/#what-is-feature-detection

But want with GeoLocation use this type of code

// Try HTML5 geolocation
 if(navigator.geolocation) {
 navigator.geolocation.getCurrentPosition(function(position) {
 var pos = new google.maps.LatLng(position.coords.latitude,
 position.coords.longitude);
 var infowindow = new google.maps.InfoWindow({
 map: map,
 position: pos,
 content: 'Location found using HTML5.'
 });
 map.setCenter(pos);
 }, function() {
 handleNoGeolocation(true);
 });
 } else {
 // Browser doesn't support Geolocation
 handleNoGeolocation(false);
 }