screen width vs visible portion

Question

I have a little problem with JavaScript, to get the screen width we use screen.width which returns the overall screen resolution, is there a command to get the resolution of

Answer 1

I saw that the question was answered, but here is the code I used with an image to ilustrate.

function height(){
return(window.innerHeight)?
window.innerHeight:
document.documentElement.clientHeight||document.body.clientHeight||0;
}
$(document).ready(function(){
$('.first, .second').css('height',height());
});
$(window).resize(function() {
$('.first, .second').css('height',height());
});

JSFiddle Example