171404 - PgUp/PgDn scroll more than one screenful

Status: RESOLVED DUPLICATE of bug 162369

(Core :: DOM: Events, defect)

Description

[Felix Miata]

2002092008 OS/2 trunk 1024 X 768.

[I can't believe this URL has and had so many bugs. I see 9 now open. None look
like this.]

To reproduce:
1-Load page
2-Strike PgDn
or
2-With prefs for mouse wheel set to scroll a page,  scroll one notch
or
2-Click the space in scrollbar

Actual behavior:
1-Roughly 3-4 text lines are skipped between end of previous display and
beginning of current display

Expected behavior:
1-Last text line of previous display becomes first text line of current display

Comments:
This is a css page, and I don't know how to tell if defective css rather than
Mozilla is to blame.

Comment 1

[Mike Kaply [:mkaply]]

Happens on Windows as well.

Comment 2

[Andrew Schultz]

actually the problem is the same as bug 171036.  the main part of the page is a
div, part of which lives under the div above it (the top of the main <div> is
actually empty space).  so when you scroll by page, it sticks the bottom of the
current page under the top <div>

Again, there is really nothing Mozilla can do about this...

Comment 3

[Andrew Schultz]

nevermind.  the div doesn't actually scroll under the top div.  the main <div>
is positioned lower.  methinks this is a dupe of bug 162369.  the problem is
that Mozilla doesn't know how to properly position the <div>'s content

Comment 4

[Boris Zbarsky [:bzbarsky]]

Yep.  More to the point, there is no way to figure out how to properly handle
it.    I, as a human, would have trouble deciding on that.... much less a rather
dumb program like a browser.

*** This bug has been marked as a duplicate of 162369 ***