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並前往https://blog.wplauncher.com/uncaught-typeerror-failed-to-execute-appendchild-on-node-parameter-1-is-not-of-type-node/

Uncaught TypeError: Failed to execute 'appendChild' on 'Node'

Instead, I should have created the link element first, added HTML to it, and then run appendChild. This is illustrated in the code below, which WORKS:

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