fix(runtime-dom): apiCustomElement fix #5687 and #5793

[hcg1023]

fix #5687
and
fix #5793

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[yyx990803]

Thanks a lot for the PR. However, since #5687 is expected behavior, part of this PR isn't really necessary.

I adapted the part that applies to #5793 in 89f37ce, hope you don't mind. In the future, please make sure to submit separate PRs when fixing different issues. Again thanks for the PR.