playwright 1.20.0 on Node.js NPM

Highlights

New options for methods page.screenshot(), locator.screenshot() and elementHandle.screenshot():
- Option animations: "disabled" rewinds all CSS animations and transitions to a consistent state.
- Option mask: Locator[] masks given elements, overlaying them with pink #FF00FF boxes.
expect().toMatchSnapshot() now supports anonymous snapshots: when snapshot name is missing, Playwright Test will generate one
automatically:
```
expect('Web is Awesome <3').toMatchSnapshot();
```
New maxDiffPixels and maxDiffPixelRatio options for fine-grained screenshot comparison using expect().toMatchSnapshot():
```
expect(await page.screenshot()).toMatchSnapshot({
  maxDiffPixels: 27, // allow no more than 27 different pixels.
});
```
It is most convenient to specify maxDiffPixels or maxDiffPixelRatio once in TestConfig.expect.
Playwright Test now adds TestConfig.fullyParallel mode. By default, Playwright Test parallelizes between files. In fully parallel mode, tests inside a single file are also run in parallel. You can also use --fully-parallel command line flag.
```
// playwright.config.ts
export default {
  fullyParallel: true,
};
```

TestProject.grep and TestProject.grepInvert are now configurable per project. For example, you can now
configure smoke tests project using grep:

// playwright.config.ts
export default {
  projects: [
    {
      name: 'smoke tests',
      grep: '@smoke',
    },
  ],
};

We now ship a designated Python docker image mcr.microsoft.com/playwright/python. Please switch over to it if you use Python. This is the last release that includes Python inside our javascript mcr.microsoft.com/playwright docker image.
v1.20 is the last release to receive WebKit update for macOS 10.15 Catalina. Please update MacOS to keep using latest & greatest WebKit!

This version was also tested against the following stable channels: