选择器

const { selectors, firefox } = require('@playwright/test');  // Or 'chromium' or 'webkit'.

(async () => {
  // Must be a function that evaluates to a selector engine instance.
  const createTagNameEngine = () => ({
    // Returns the first element matching given selector in the root's subtree.
    query(root, selector) {
      return root.querySelector(selector);
    },

    // Returns all elements matching given selector in the root's subtree.
    queryAll(root, selector) {
      return Array.from(root.querySelectorAll(selector));
    }
  });

  // Register the engine. Selectors will be prefixed with "tag=".
  await selectors.register('tag', createTagNameEngine);

  const browser = await firefox.launch();
  const page = await browser.newPage();
  await page.setContent(`<div><button>Click me</button></div>`);

  // Use the selector prefixed with its name.
  const button = page.locator('tag=button');
  // We can combine it with built-in locators.
  await page.locator('tag=div').getByText('Click me').click();
  // Can use it in any methods supporting selectors.
  const buttonCount = await page.locator('tag=button').count();

  await browser.close();
})();

selectors.setTestIdAttribute(attributeName);