why html`<button onclick="displayDate()">The time is?</button>` not work?

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Thanks for your reply, but the import cell has nothing to do with the problem I posted above. Maybe I didn’t describe the problem I have clearly.

So now I have tried to make the notebook consistent with my question here by adding cell 1 and cell 2 comment in the notebook. please see the notebook w3school's JS Events tutorial / 深度碎片 | Observable

The questions I have:

  1. why neither running cell 1 and clicking the button produced by cell 1 can display the date?
  2. why clicking the button produced by cell 2 won’t display the date? ( I understand that running cell 2 can display the date)

Thanks