The following method will allow you to simulate a drag-and-drop action in Puppeteer:
const example = await page.$('#example');
const bounding_box = await example.boundingBox();
await page.mouse.move(bounding_box.x + bounding_box.width / 2, bounding_box.y + bounding_box.height / 2);
await page.mouse.move(126, 19);
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