improve in element support #5560

Job	Run time
Build extensions	1m 21s
Test	2m 9s
ember-try (ember-lts-3.16)	1m 9s
ember-try (ember-lts-3.20)	1m 29s
ember-try (ember-lts-3.24)	1m 24s
ember-try (ember-lts-3.28)	1m 20s
ember-try (ember-release)	1m 20s
ember-try (ember-beta)	1m 20s
ember-try (ember-canary)	1m 32s
ember-try (ember-default-no-prototype-extensions)	1m 8s
Publish Chrome extension	10s
Publish Firefox extension	25s
Publish GitHub release	0s
Publish npm package	4s
Publish bookmarklet	0s
	14m 51s

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