↑
Main Page

screen object

Property/Method Description

IE Moz Op Saf

onLine

Boolean indicating if the browser is attached

X – – –

to the Internet

oscpu

String representing the operating system or the CPU – X – –

platform

String representing the computer platform that X X X X

the browser is running on

plugins

Array of plugins installed in the browser

X X X X

preference()

Function used to set browser preferences

– X X –

product

String representing the name of the product

– X – X

(typically

“Gecko”

)

productSub

String representing extra information about

– X – X

the product (typically the Gecko version)

opsProfile

–– ––

securityPolicy

–X––

systemLanguage

* String representing the operating system’s language X – – –

taintEnabled()

Boolean indicating if data tainting is enabled

X X X X

userAgent

String representing the user-agent header string X X X X

userLanguage

* String representing the operating system’s language X – – –

userProfile

Object allowing access to the browser user profile X – – –

vendor

String representing the name of the branded

– X – X

browser (typically

“Netscape6”

“Netscape”

)

vendorSub

String representing extra information for the

– X – X

branded browser (typically the version of Netscape)

* Most of the time,

browserLanguage

systemLanguage

, and

userLanguage

are the same.

The

navigator

object is extremely helpful in determining what browser is being used to view a page.

A quick search of the Internet reveals any number of methodologies for browser detection, all of which

make extensive use of

navigator

. Browser and operating-system detection using the

navigator

object

is discussed in greater detail in Chapter 9.

The screen object

Although most information about the user ’s system is hidden for security reasons, it is possible to get a

certain amount of information about the user ’s monitor using the

screen

object (which, you may have

already guessed, is a property of

window

as well).

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