improve in element support #5568

Job	Run time
Test	2m 5s
Build extensions	1m 31s
ember-try (ember-lts-3.16)	1m 4s
ember-try (ember-lts-3.20)	1m 26s
ember-try (ember-lts-3.24)	1m 22s
ember-try (ember-lts-3.28)	1m 12s
ember-try (ember-release)	1m 28s
ember-try (ember-beta)	1m 23s
ember-try (ember-canary)	1m 15s
ember-try (ember-default-no-prototype-extensions)	1m 8s
Publish Firefox extension	0s
Publish bookmarklet	0s
Publish npm package	0s
Publish GitHub release	0s
Publish Chrome extension	0s
	13m 54s

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