check cloning element
check cloning element
up comment
addition to shim CustomEvent
revert CustomElements changes
Revert "revert CustomElements changes"

This reverts commit 3ca60a8dc8eeead1ec79fb1ec7f7833f9efa99a5.
revert CustomElements changes
Merge pull request #122 from Katochimoto/custom-event

CustomEvent shim