They currently use the element's block-direction measurement of the containing block.
Created attachment 176861 [details] Initial patch First pass at a patch, using the containing block's logical width to resolve all percentage margins.
Created attachment 176863 [details] Updated patch Uploading a newer version of the patch, with changelogs and tests.
Created attachment 176871 [details] Updating tests
Created attachment 177529 [details] Updating changelogs & tests
Created attachment 179384 [details] Converting to static html content Creating the containers and elements with HTML markup rather than Javascript to make the test easier to read.
Comment on attachment 179384 [details] Converting to static html content Thanks for making the test changes I suggested. Looks good.
Comment on attachment 179384 [details] Converting to static html content Clearing flags on attachment: 179384 Committed r137695: <http://trac.webkit.org/changeset/137695>
All reviewed patches have been landed. Closing bug.