// Using ‘page.mouse’ to trace a 100x100 square.
await page.mouse.move(0, 0);
await page.mouse.down();
await page.mouse.move(0, 100);
await page.mouse.move(100, 100);
await page.mouse.move(100, 0);
await page.mouse.move(0, 0);
await page.mouse.up();

Note: The mouse events trigger synthetic MouseEvents. This means that it does not fully replicate the functionality of what a normal user would be able to do with their mouse.

For example, dragging and selecting text is not possible using page.mouse. Instead, you can use the DocumentOrShadowRoot.getSelection() functionality implemented in the platform.

await page.evaluate((from, to) => {
  const selection = from.getRootNode().getSelection();
  const range = document.createRange();
  range.setStartBefore(from);
  range.setEndAfter(to);
  selection.removeAllRanges();
  selection.addRange(range);
}, fromJSHandle, toJSHandle);

If you then would want to copy-paste your selection, you can use the clipboard api:

// The clipboard api does not allow you to copy, unless the tab is focused.
await page.bringToFront();
await page.evaluate(() => {
  // Copy the selected content to the clipboard
  document.execCommand('copy');
  // Obtain the content of the clipboard as a string
  return navigator.clipboard.readText();
});

Note: If you want access to the clipboard API, you have to give it permission to do so:

await browser.defaultBrowserContext().overridePermissions(
  '<your origin>', ['clipboard-read', 'clipboard-write']
);