Identificare BROWSER

navigator.appName :
navigator.appVersion:
navigator.userAgent :
window.screen.width :
window.screen.height :
window.screen.availWidth :
window.screen.availHeight :
window.devicePixelRatio :
width x PixelRatio :
height x PixelRatio :

https://stackoverflow.com/questions/16277383/javascript-screen-height-and-screen-width-returns-incorrect-values