If a validation message could be cloned, it may be broken by the same cause as bug 61909.
I guess cloning validation message nodes doesn't cause critical problems such as crash. However, no one won't hide a cloned validation message. Validation message nodes should not be cloned.
Oops, I was wrong ;-(
Created attachment 97539 [details] Patch
How about to use layoutTestController.shadowRoot() and check pseudo id for clones shadows? Another idea is to give r+ to Bug 62432, then use elementRenderTreeAsText(), which allows us a kind of reftests ;-)
Created attachment 97564 [details] Patch 2 Check pseudo ID
(In reply to comment #4) > How about to use layoutTestController.shadowRoot() and > check pseudo id for clones shadows? It's reasonable. Thanks!
Comment on attachment 97564 [details] Patch 2 Hi Kent-san, I'm sorry for slow response... And during my lazy time, layoutTestController.shadowRoot() is obsoleted. Could you rewrite this with window.internals.shadowRoot() ? I'm sorry again for the inconvenience.
Created attachment 98881 [details] Patch 3 window.internals
Comment on attachment 98881 [details] Patch 3 Clearing flags on attachment: 98881 Committed r89919: <http://trac.webkit.org/changeset/89919>
All reviewed patches have been landed. Closing bug.