Created attachment 82132 [details] archive containing iframe.html and blink.html This issue affects performance. When page with nested iframes is visited, continues relayout can be observed when iframes source contains elements with padding set by styles. This issue can be reproduced only when frame flattening is on. Steps to reproduce: 1. set frame flattening on 2. visit example site iframe.html (check attachment ) BR, Piotrek
I tested and reproduced same problem in GTK+, EFL, Qt port.
Created attachment 84710 [details] patch with fix for reported issue
Attachment 84710 [details] did not pass style-queue: Failed to run "['Tools/Scripts/check-webkit-style', '--diff-files', u'Source/WebCore/ChangeLog', u'Source/WebCor..." exit_code: 1 Source/WebCore/ChangeLog:5: Line contains tab character. [whitespace/tab] [5] Total errors found: 1 in 4 files If any of these errors are false positives, please file a bug against check-webkit-style.
Created attachment 84941 [details] fixed style issue
Comment on attachment 84941 [details] fixed style issue View in context: https://bugs.webkit.org/attachment.cgi?id=84941&action=review Lets add a layout test so it does not regress. If it is not possible, explain why or provide at least a manual test. > Source/WebCore/ChangeLog:3 > + Unreviewed Do not change this line: leave the "Review by NOBODY (OOPS)"