fix: <template> tag for browsers that do not support them

[yjbanov]

No description provided.

[vicb]

I guess templateAwareRoot() also needs to be modified ?

[mhevery]

@vicb templateAwareRoot already has the check. this should be LGTM

[mary-poppins]

Merging PR #3636 on behalf of @mhevery to branch presubmit-mhevery-pr-3636.

[vicb]

@mhevery I was not sure if is TemplateElement would work for those browser

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