Created attachment 219913 [details] Test case showing the current behaviour As stated in the transform-style spec (http://www.w3.org/TR/css3-transforms/#propdef-transform-style), setting a blend mode must force transform-style:flat.
Created attachment 225066 [details] Patch V1
Created attachment 225130 [details] Patch V2 Updated test with description. Also test if transform-style is not changed for an element with blend-mode:normal.
Comment on attachment 225130 [details] Patch V2 r=me
Comment on attachment 225130 [details] Patch V2 Clearing flags on attachment: 225130 Committed r164640: <http://trac.webkit.org/changeset/164640>
All reviewed patches have been landed. Closing bug.