Bug 44529

Summary:

beforeload listener causes rendering flash

Product:

WebKit

Reporter:

Drew Thaler <drewthaler>

Component:

Layout and Rendering

Assignee:

Nobody <webkit-unassigned>

Status:

UNCONFIRMED

Severity:

Normal

CC:

danbedford, hyatt, mitz

Priority:

Version:

528+ (Nightly build)

Hardware:

Mac (Intel)

OS:

OS X 10.6

URL:

http://cbgb.com/

Attachments:

Description	Flags
screenshots and extension	none

Drew Thaler

Reported 2010-08-24 09:29:05 PDT

Created attachment 65283 [details] screenshots and extension A highly reproducible rendering flash occurs on http://cbgb.com/ whenever a Safari extension adds a 'beforeload' listener to the page. It doesn't matter what's in the listener; the problem can be reproduced with a trivial empty listener. Removing the listener eliminates the problem. The site is using jShowoff to rotate through different header images every 8 seconds or so. The initial load of the page is OK, but almost every time the header rotates after that, it will render incorrectly for a fraction of a second as it changes to the next image. The attached zip includes: - header-good.png = screenshot of correct rendering - header-bad.png = screenshot of incorrect rendering - beforeload.safariextension = source of Safari extension to reproduce the problem - beforeload.safariextz = packaged Safari extension to reproduce the problem

Attachments
screenshots and extension (2.12 MB, application/zip) 2010-08-24 09:29 PDT, Drew Thaler	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Drew Thaler

Comment 1 2010-08-24 09:31:20 PDT

Sorry, I should've mentioned the versions. I've reproduced it on both Safari 5.0.1 and WebKit Nightly r65825.

Alexey Proskuryakov

Comment 2 2010-09-07 12:34:58 PDT