Important and unknown default browser values

Here are some of the default values of your browser
bodydocumentElement
marginunknown or not availableunknown or not available
borderunknown or not availableunknown or not available
paddingunknown or not availableunknown or not available
overflowunknown or not availableunknown or not available
overflow-y (CSS 3)not supportednot supported
css widthunknown or not availableunknown or not available
css heightunknown or not availableunknown or not available

Mozilla supports CSS3 overflow-x and overflow-y since september 2004 in 1.8a3 builds:
Bug 72747: implement overflow-x and overflow-y

Valid HTML 4.01! CSS compliant Web standards project