http://code.google.com/p/chromium/issues/detail?id=76257 This doesn't happen on Mac because arrow keys show a popup menu on Mac (ARROW_KEYS_POP_MENU in dom/SelectElement.cpp)
Oh, I have found a way to reproduce this problem on Mac.
Created attachment 93870 [details] Patch
Comment on attachment 93870 [details] Patch Code looks fine. Can we test item selections using lookahead-search and accesskey? both reaches setSelectedIndex().
Created attachment 93882 [details] Patch 2 Adding an accesskey test
(In reply to comment #3) > (From update of attachment 93870 [details]) > Code looks fine. Can we test item selections using lookahead-search and accesskey? both reaches setSelectedIndex(). I have added an accesskey test. The previous patch already had a test for lookahead search.
Created attachment 93884 [details] Patch 3 Remove unnecessary change
Comment on attachment 93884 [details] Patch 3 Kent-san, thank you for adding tests!
Thank you for reviewing!
Comment on attachment 93884 [details] Patch 3 Clearing flags on attachment: 93884 Committed r86744: <http://trac.webkit.org/changeset/86744>
All reviewed patches have been landed. Closing bug.