The function was using deprecated idioms, see https://developer.mozilla.org/en-US/docs/Web/API/document/execCommand, and "PrivilegeManager" and the "netscape" property, both long discontinued.
On modern browsers, under the correct conditions, the function can be reimplemented via a oneliner (see https://developer.mozilla.org/en-US/docs/Web/API/Clipboard)
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