scrollWidth offsetWidth offsetHeight offsetLeft .

scrollWidth offsetWidth offsetHeight offsetLeft .....

?

?
?IE 
scrollWidth :20
scrollHeight :39
offsetWidth :300
offsetHeight :200
clientWidth :286
clientHeight :186
offsetLeft: 3
offsetTop: 5
?
IE中 border + clientWidth? = width 
?
?
FF:
?
scrollWidth :334
scrollHeight :234
offsetWidth :334
offsetHeight :234
clientWidth :320
clientHeight :220
offsetLeft: 3
offsetTop: 5
?
FF 中 :
??? clientWidth? = width + padding
?