A bookmarklet that copies the current tab's url to the clipboard. Tested in Safari and can be triggered by keyboard shortcut if `Use ⌘-1 to ⌘-9 to switch tabs` is disabled.

copy-url-bookmarklet.js

javascript: !(function (window, document) {
  var tempTextArea = document.createElement("textarea");

  const copyText = document.getSelection();
  (tempTextArea.textContent = window.location.href),
    document.body.appendChild(tempTextArea),
    copyText.removeAllRanges(),
    tempTextArea.select(),
    document.execCommand("copy"),
    copyText.removeAllRanges(),
    document.body.removeChild(tempTextArea);
})(window, document);