getViewport returning somtetimes a null height in firefox

[guest]

Hi evryone ! I noticed a problem with the getViewport function in firefox (2.0.0.6).
Sometimes it returns a 0 height. It works great on the tests page but when using it in a particular page of my app, that bug occurs, resulting the layout to be messed up (combobox opening upward every time, dialog showing above the top of screen...)
After some researches I saw the problem was coming from [10345]:

h = _document.body.clientHeight<=_window.innerHeight ? _document.body.clientHeight : _document.documentElement.clientHeight;

When the probleme is happening, _document.body.clientHeight == 0.
In my mind, this value has to be checked before doing an inferiority test.

[bill]

OK, please provide a testcase.

[guest]

But that's the problem, the testcase is my application. On simples pages there is no problem, so I don't know what the problem is. I just saw the effects.

[haysmark]

​http://developer.mozilla.org/en/docs/DOM:element.clientHeight

0 clientHeight isn't in the spec, so we really need the test case since it's clearly a browser bug.

[Douglas Hays]

Did this just get fixed?

[haysmark]

Reproduced. Clearly if you wrap your body in a position:absolute div, the body has no inline content and thus has 0 height. This occurs with strict dtd.

On the other hand, with no dtd, documentElement is the one with 0 height, so the [10345] check works.

I can verify that [10680] fixes this and makes getViewport compatible across all dtds.