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WebKit does not support CSS3 column-span:
The new multi-column support is pretty nice, but it's missing a useful "column-span" property. See attached test case for a demonstration of column-span: all;
Created an attachment (id=16713) [details]
For the record, I've begun a small, private endeavour to try to see if I can get this working. If I hit any major stumbling blocks, I'll post here.
However, if anyone begins implementing this; please say so :-)
Created an attachment (id=57362) [details]
Attachment 57362 [details] did not pass style-queue:
Failed to run "['WebKitTools/Scripts/check-webkit-style', '--no-squash']" exit_code: 1
WebCore/rendering/RenderBlock.cpp:326: An else statement can be removed when the prior "if" concludes with a return, break, continue or goto statement. [readability/control_flow] 
WebCore/rendering/RenderBlock.cpp:331: An else if statement should be written as an if statement when the prior "if" concludes with a return, break, continue or goto statement. [readability/control_flow] 
WebCore/rendering/RenderBlock.cpp:390: Boolean expressions that span multiple lines should have their operators on the left side of the line instead of the right side. [whitespace/operators] 
Total errors found: 3 in 9 files
If any of these errors are false positives, please file a bug against check-webkit-style.
Created an attachment (id=57376) [details]
Fix style issues
(From update of attachment 57376 [details])
Fixed in r60494.