Make positioned blocks work with variable width regions. This means the offsets and widths actually compute independently in each region if needed.
Created attachment 110634 [details]
Attachment 110634 [details] did not pass style-queue:
Failed to run "['Tools/Scripts/check-webkit-style', '--diff-files', u'LayoutTests/ChangeLog', u'LayoutTests/fast..." exit_code: 1
Source/WebCore/rendering/LayoutState.cpp:97: Should have only a single space after a punctuation in a comment. [whitespace/comments] 
Source/WebCore/rendering/RenderBox.h:469: The parameter name "region" adds no information, so it should be removed. [readability/parameter_name] 
Total errors found: 2 in 29 files
If any of these errors are false positives, please file a bug against check-webkit-style.
Comment on attachment 110634 [details]
Attachment 110634 [details] did not pass chromium-ews (chromium-xvfb):
Created attachment 110635 [details]
Fixed in 97282.