docs: update release notes docs (#6974)

docs/src/release-notes.md

@@ -5,6 +5,102 @@ title: "Release notes"
 
 <!-- TOC -->
 
+## Version 1.12
+
+#### ⚡️ Introducing Playwright TestRunner
+
+[Playwright TestRunner](./test-intro.md) is a **new test runner** built from scratch by Playwright team specifically to accommodate end-to-end testing needs:
+
+- Run tests across all browsers.
+- Execute tests in parallel.
+- Enjoy context isolation and sensible defaults out of the box.
+- Capture videos, screenshots and other artifacts on failure.
+- Integrate your POMs as extensible fixtures.
+
+Installation:
+```bash
+npm i -D @playwright/test
+```
+
+Simple test `tests/foo.spec.ts`:
+
+```ts
+import { test, expect } from '@playwright/test';
+
+test('basic test', async ({ page }) => {
+  await page.goto('https://playwright.dev/');
+  const name = await page.innerText('.navbar__title');
+  expect(name).toBe('Playwright');
+});
+```
+
+Running:
+
+```bash
+npx playwright test -c tests
+```
+
+👉  Read more in [testrunner documentation](./test-intro.md).
+
+#### 🧟‍♂️ Introducing Playwright Trace Viewer
+
+[Playwright Trace Viewer](./trace-viewer.md) is a new GUI tool that helps exploring recorded Playwright traces after the script ran. Playwright traces let you examine:
+- page DOM before and after each Playwright action
+- page rendering before and after each Playwright action
+- browser network during script execution
+
+Traces are recorded using the new [`property: BrowserContext.tracing`] API:
+
+```ts
+const browser = await chromium.launch();
+const context = await browser.newContext();
+
+// Start tracing before creating / navigating a page.
+await context.tracing.start({ screenshots: true, snapshots: true });
+
+const page = await context.newPage();
+await page.goto('https://playwright.dev');
+
+// Stop tracing and export it into a zip archive.
+await context.tracing.stop({ path: 'trace.zip' });
+```
+
+Traces are examined later with the Playwright CLI:
+
+
+```sh
+npx playwright show-trace trace.zip
+```
+
+That will open the following GUI:
+
+![image](https://user-images.githubusercontent.com/746130/121109654-d66c4480-c7c0-11eb-8d4d-eb70d2b03811.png)
+
+👉 Read more in [trace viewer documentation](./trace-viewer.md).
+
+
+#### Browser Versions
+
+- Chromium 93.0.4530.0
+- Mozilla Firefox 89.0
+- WebKit 14.2
+
+This version of Playwright was also tested against the following stable channels:
+
+- Google Chrome 91
+- Microsoft Edge 91
+
+#### New APIs
+
+- `reducedMotion` option in [`method: Page.emulateMedia`], [`method: BrowserType.launchPersistentContext`], [`method: Browser.newContext`] and [`method: Browser.newPage`]
+- [`event: BrowserContext.request`]
+- [`event: BrowserContext.requestFailed`]
+- [`event: BrowserContext.requestFinished`]
+- [`event: BrowserContext.response`]
+- `tracesDir` option in [`method: BrowserType.launch`] and [`method: BrowserType.launchPersistentContext`]
+- new [`property: BrowserContext.tracing`] API namespace
+- new [`method: Download.page`] method
+
 ## Version 1.11
 
 🎥  New video: [Playwright: A New Test Automation Framework for the Modern Web](https://youtu.be/_Jla6DyuEu4) ([slides](https://docs.google.com/presentation/d/1xFhZIJrdHkVe2CuMKOrni92HoG2SWslo0DhJJQMR1DI/edit?usp=sharing))