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chromium/third_party/blink/web_tests/wpt_internal/clipboard-apis/resources/user-activation.js 

'use strict';

// In order to use this function, please import testdriver.js and
// testdriver-vendor.js, and include a <body> element.
async function waitForUserActivation() {
  if (window.opener) {
    throw new Error(
        "waitForUserActivation() only works in the top-level frame");
  }
  const loadedPromise = new Promise(resolve => {
    if(document.readyState == 'complete') {
      resolve();
      return;
    }
    window.addEventListener('load', resolve, {once: true});
  });
  await loadedPromise;

  const clickedPromise = new Promise(resolve => {
    document.body.addEventListener('click', resolve, {once: true});
  });

  test_driver.click(document.body);
  await clickedPromise;
}