Bug 17841

Summary:

FireFox 3 redraws less than Safari 3 when scrolling DIVs with "overflow: auto"

Product:

WebKit

Reporter:

Eric Seidel (no email) <eric>

Component:

New Bugs

Assignee:

Nobody <webkit-unassigned>

Status:

NEW

Severity:

Normal

CC:

ovafai

Priority:

Version:

528+ (Nightly build)

Hardware:

Mac

OS:

OS X 10.5

Attachments:

Description	Flags
test case (use quartz debug to see difference)	none

Eric Seidel (no email)

Reported 2008-03-13 22:05:41 PDT

FireFox 3 redraws less than Safari 3 when scrolling subframes Try the attached test case with Quartz Debug enabled. FireFox 2 has our same behavior (of always redrawing the entire scroll area). This study was prompted by a colleague of mine mentioning that one of the Google Web Apps had to switch away from using <div> with overflow: auto due to performance issues, and use iframes instead. It seems it must not have been FF or Safari motivating that switch however. Regardless, we could improve our scrolling behavior here.

Attachments
test case (use quartz debug to see difference) (1.42 KB, text/html) 2008-03-13 22:06 PDT, Eric Seidel (no email)	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Eric Seidel (no email)

Comment 1 2008-03-13 22:06:06 PDT

Created attachment 19756 [details] test case (use quartz debug to see difference)

Eric Seidel (no email)

Comment 2 2008-03-19 09:58:25 PDT

Even though my test is bad... Safari redraws more than FF3 in *both* the iframe case and the div overflow: auto case.

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