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I get 100 on both on Chrome. So please also specify which browser you're using.

win xp. ie 7, 8. if you like jsFiddle see http://jsfiddle.net/UHDaG/

if table has margin less than 0 (for example margin-top: -100px) outerHeight will be broken (for example 0px)

please read: http://www.w3.org/TR/CSS2/tables.html#height-layout and http://www.w3.org/TR/CSS2/tables.html#table-layout

"Internal table elements do not have margins."

"The height of a 'table-row' element's box is calculated once the user agent has all the cells in the row available: it is the maximum of the row's computed 'height', the computed 'height' of each cell in the row, and the minimum height (MIN) required by the cells."

In short, while TR's can have height (which is not wholely determined by the css provided), they can not have margin. Some browsers inherit the margin from the parent TABLE and others allow setting the property on a TR, but neither value is the correct one. Simply don't user outerheight on a TR.

Please let me know what the use case here is on why you were trying to measure margin on a TR.

Because we get so many tickets, we often need to return them to the initial reporter for more information. If that person does not reply within 14 days, the ticket will automatically be closed, and that has happened in this case. If you still are interested in pursuing this issue, feel free to add a comment with the requested information and we will be happy to reopen the ticket if it is still valid. Thanks!

I know this got autoclosed... needs docs maybe? Don't try to measure margin on a TR?