window // represents the browser window or tab 
document // represents the HTML document loaded in the window (DOM) 
navigator // provides information about the browser 
location // represents the URL of the current page 
history // represents the browser's session history 

navigator.cookieEnabled // boolean indicates whether cookes are enabled or not 
navigator.userAgent // returns user agent header string for current browser 
navigator.language // returns language being used by browser 
navigator.onLine // returns true if online 

history.back() // same as clicking back in the browser 
history.forward() // same as clicking forward in the browser 

history.go(n) // go to a specific position in the history stack n (positive or negative integer) 
history.pushState(state, title, URL) // adds an entry to the browser's session history stack 
history.replaceState(state, title, URL) // modifies the current history entry with a new state and URL  

window.innerHeight // returns the interior height of the window in pixels including height of scrollbar 
window.innerWidth // returns interior width of the window in pixels, includes width of vertical scroll bar 
window.open(url, target, features) // opens a new window with specified URL, target, and features 
window.close() // closes current window
window.moveTo(x, y) // moves the current window to the specified coordinates 
window.resizeTo(width, height) // dynamically resizes the window 
window.scrollTo({top: 0, behavior: "smooth"}) // scrolls to a position on the document

location.href // returns current URL, also can be used to modify it 
location.hostname // returns the domain name of the web host 
location.pathname // returns the path and filename of current page 
location.protocol // represents protocol scheme or URL, http: or https: 
location.port // returns the number of the internet host port 
location.assign() // methods causes the window to load and display the document at URL specified 

screen.width // returns the width of the screen in pixels 
screen.height // returns the height of the screen in pixels 
screen.availWidth // returns the amount of width available 
screen.availHeight // returns the amount of height available 
screen.colorDepth // returns the color depth of the screen 
screen.pixelDepth // returns the pixel depth of the screen 

alert(msg) // displays an alert dialog box with message 
confirm(msg) // displays a dialog to confirm or cancel, returns boolean 
prompt(msg, defaultText) // display a dialog prompting user to input some text, returns input 
open(url, target, features) opens a new browser window or tab 
close() // closes the current browser window or tab 
setTimeout(function, delay) // executes a function after a delay 
clearTimeout(timeoutID) // to cancel a timeout function before it executes 
setInterval(function, delay) // to repeatedly call a function with a specified delay 
clearInterval(intervalID) // to cancel the repeated execution of the interval function