This commit is contained in:
alex wiesner
2026-04-09 11:31:06 +01:00
parent 8fec8e28f4
commit 18245c778e
155 changed files with 16206 additions and 2980 deletions

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# Inspecting Element Attributes
When the snapshot doesn't show an element's `id`, `class`, `data-*` attributes, or other DOM properties, use `eval` to inspect them.
## Examples
```bash
playwright-cli snapshot
# snapshot shows a button as e7 but doesn't reveal its id or data attributes
# get the element's id
playwright-cli eval "el => el.id" e7
# get all CSS classes
playwright-cli eval "el => el.className" e7
# get a specific attribute
playwright-cli eval "el => el.getAttribute('data-testid')" e7
playwright-cli eval "el => el.getAttribute('aria-label')" e7
# get a computed style property
playwright-cli eval "el => getComputedStyle(el).display" e7
```

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# Running Playwright Tests
To run Playwright tests, use the `npx playwright test` command, or a package manager script. To avoid opening the interactive html report, use `PLAYWRIGHT_HTML_OPEN=never` environment variable.
```bash
# Run all tests
PLAYWRIGHT_HTML_OPEN=never npx playwright test
# Run all tests through a custom npm script
PLAYWRIGHT_HTML_OPEN=never npm run special-test-command
```
# Debugging Playwright Tests
To debug a failing Playwright test, run it with `--debug=cli` option. This command will pause the test at the start and print the debugging instructions.
**IMPORTANT**: run the command in the background and check the output until "Debugging Instructions" is printed.
Once instructions containing a session name are printed, use `playwright-cli` to attach the session and explore the page.
```bash
# Run the test
PLAYWRIGHT_HTML_OPEN=never npx playwright test --debug=cli
# ...
# ... debugging instructions for "tw-abcdef" session ...
# ...
# Attach to the test
playwright-cli attach tw-abcdef
```
Keep the test running in the background while you explore and look for a fix.
The test is paused at the start, so you should step over or pause at a particular location
where the problem is most likely to be.
Every action you perform with `playwright-cli` generates corresponding Playwright TypeScript code.
This code appears in the output and can be copied directly into the test. Most of the time, a specific locator or an expectation should be updated, but it could also be a bug in the app. Use your judgement.
After fixing the test, stop the background test run. Rerun to check that test passes.

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# Request Mocking
Intercept, mock, modify, and block network requests.
## CLI Route Commands
```bash
# Mock with custom status
playwright-cli route "**/*.jpg" --status=404
# Mock with JSON body
playwright-cli route "**/api/users" --body='[{"id":1,"name":"Alice"}]' --content-type=application/json
# Mock with custom headers
playwright-cli route "**/api/data" --body='{"ok":true}' --header="X-Custom: value"
# Remove headers from requests
playwright-cli route "**/*" --remove-header=cookie,authorization
# List active routes
playwright-cli route-list
# Remove a route or all routes
playwright-cli unroute "**/*.jpg"
playwright-cli unroute
```
## URL Patterns
```
**/api/users - Exact path match
**/api/*/details - Wildcard in path
**/*.{png,jpg,jpeg} - Match file extensions
**/search?q=* - Match query parameters
```
## Advanced Mocking with run-code
For conditional responses, request body inspection, response modification, or delays:
### Conditional Response Based on Request
```bash
playwright-cli run-code "async page => {
await page.route('**/api/login', route => {
const body = route.request().postDataJSON();
if (body.username === 'admin') {
route.fulfill({ body: JSON.stringify({ token: 'mock-token' }) });
} else {
route.fulfill({ status: 401, body: JSON.stringify({ error: 'Invalid' }) });
}
});
}"
```
### Modify Real Response
```bash
playwright-cli run-code "async page => {
await page.route('**/api/user', async route => {
const response = await route.fetch();
const json = await response.json();
json.isPremium = true;
await route.fulfill({ response, json });
});
}"
```
### Simulate Network Failures
```bash
playwright-cli run-code "async page => {
await page.route('**/api/offline', route => route.abort('internetdisconnected'));
}"
# Options: connectionrefused, timedout, connectionreset, internetdisconnected
```
### Delayed Response
```bash
playwright-cli run-code "async page => {
await page.route('**/api/slow', async route => {
await new Promise(r => setTimeout(r, 3000));
route.fulfill({ body: JSON.stringify({ data: 'loaded' }) });
});
}"
```

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# Running Custom Playwright Code
Use `run-code` to execute arbitrary Playwright code for advanced scenarios not covered by CLI commands.
## Syntax
```bash
playwright-cli run-code "async page => {
// Your Playwright code here
// Access page.context() for browser context operations
}"
```
## Geolocation
```bash
# Grant geolocation permission and set location
playwright-cli run-code "async page => {
await page.context().grantPermissions(['geolocation']);
await page.context().setGeolocation({ latitude: 37.7749, longitude: -122.4194 });
}"
# Set location to London
playwright-cli run-code "async page => {
await page.context().grantPermissions(['geolocation']);
await page.context().setGeolocation({ latitude: 51.5074, longitude: -0.1278 });
}"
# Clear geolocation override
playwright-cli run-code "async page => {
await page.context().clearPermissions();
}"
```
## Permissions
```bash
# Grant multiple permissions
playwright-cli run-code "async page => {
await page.context().grantPermissions([
'geolocation',
'notifications',
'camera',
'microphone'
]);
}"
# Grant permissions for specific origin
playwright-cli run-code "async page => {
await page.context().grantPermissions(['clipboard-read'], {
origin: 'https://example.com'
});
}"
```
## Media Emulation
```bash
# Emulate dark color scheme
playwright-cli run-code "async page => {
await page.emulateMedia({ colorScheme: 'dark' });
}"
# Emulate light color scheme
playwright-cli run-code "async page => {
await page.emulateMedia({ colorScheme: 'light' });
}"
# Emulate reduced motion
playwright-cli run-code "async page => {
await page.emulateMedia({ reducedMotion: 'reduce' });
}"
# Emulate print media
playwright-cli run-code "async page => {
await page.emulateMedia({ media: 'print' });
}"
```
## Wait Strategies
```bash
# Wait for network idle
playwright-cli run-code "async page => {
await page.waitForLoadState('networkidle');
}"
# Wait for specific element
playwright-cli run-code "async page => {
await page.locator('.loading').waitFor({ state: 'hidden' });
}"
# Wait for function to return true
playwright-cli run-code "async page => {
await page.waitForFunction(() => window.appReady === true);
}"
# Wait with timeout
playwright-cli run-code "async page => {
await page.locator('.result').waitFor({ timeout: 10000 });
}"
```
## Frames and Iframes
```bash
# Work with iframe
playwright-cli run-code "async page => {
const frame = page.locator('iframe#my-iframe').contentFrame();
await frame.locator('button').click();
}"
# Get all frames
playwright-cli run-code "async page => {
const frames = page.frames();
return frames.map(f => f.url());
}"
```
## File Downloads
```bash
# Handle file download
playwright-cli run-code "async page => {
const downloadPromise = page.waitForEvent('download');
await page.getByRole('link', { name: 'Download' }).click();
const download = await downloadPromise;
await download.saveAs('./downloaded-file.pdf');
return download.suggestedFilename();
}"
```
## Clipboard
```bash
# Read clipboard (requires permission)
playwright-cli run-code "async page => {
await page.context().grantPermissions(['clipboard-read']);
return await page.evaluate(() => navigator.clipboard.readText());
}"
# Write to clipboard
playwright-cli run-code "async page => {
await page.evaluate(text => navigator.clipboard.writeText(text), 'Hello clipboard!');
}"
```
## Page Information
```bash
# Get page title
playwright-cli run-code "async page => {
return await page.title();
}"
# Get current URL
playwright-cli run-code "async page => {
return page.url();
}"
# Get page content
playwright-cli run-code "async page => {
return await page.content();
}"
# Get viewport size
playwright-cli run-code "async page => {
return page.viewportSize();
}"
```
## JavaScript Execution
```bash
# Execute JavaScript and return result
playwright-cli run-code "async page => {
return await page.evaluate(() => {
return {
userAgent: navigator.userAgent,
language: navigator.language,
cookiesEnabled: navigator.cookieEnabled
};
});
}"
# Pass arguments to evaluate
playwright-cli run-code "async page => {
const multiplier = 5;
return await page.evaluate(m => document.querySelectorAll('li').length * m, multiplier);
}"
```
## Error Handling
```bash
# Try-catch in run-code
playwright-cli run-code "async page => {
try {
await page.getByRole('button', { name: 'Submit' }).click({ timeout: 1000 });
return 'clicked';
} catch (e) {
return 'element not found';
}
}"
```
## Complex Workflows
```bash
# Login and save state
playwright-cli run-code "async page => {
await page.goto('https://example.com/login');
await page.getByRole('textbox', { name: 'Email' }).fill('user@example.com');
await page.getByRole('textbox', { name: 'Password' }).fill('secret');
await page.getByRole('button', { name: 'Sign in' }).click();
await page.waitForURL('**/dashboard');
await page.context().storageState({ path: 'auth.json' });
return 'Login successful';
}"
# Scrape data from multiple pages
playwright-cli run-code "async page => {
const results = [];
for (let i = 1; i <= 3; i++) {
await page.goto(\`https://example.com/page/\${i}\`);
const items = await page.locator('.item').allTextContents();
results.push(...items);
}
return results;
}"
```

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# Browser Session Management
Run multiple isolated browser sessions concurrently with state persistence.
## Named Browser Sessions
Use `-s` flag to isolate browser contexts:
```bash
# Browser 1: Authentication flow
playwright-cli -s=auth open https://app.example.com/login
# Browser 2: Public browsing (separate cookies, storage)
playwright-cli -s=public open https://example.com
# Commands are isolated by browser session
playwright-cli -s=auth fill e1 "user@example.com"
playwright-cli -s=public snapshot
```
## Browser Session Isolation Properties
Each browser session has independent:
- Cookies
- LocalStorage / SessionStorage
- IndexedDB
- Cache
- Browsing history
- Open tabs
## Browser Session Commands
```bash
# List all browser sessions
playwright-cli list
# Stop a browser session (close the browser)
playwright-cli close # stop the default browser
playwright-cli -s=mysession close # stop a named browser
# Stop all browser sessions
playwright-cli close-all
# Forcefully kill all daemon processes (for stale/zombie processes)
playwright-cli kill-all
# Delete browser session user data (profile directory)
playwright-cli delete-data # delete default browser data
playwright-cli -s=mysession delete-data # delete named browser data
```
## Environment Variable
Set a default browser session name via environment variable:
```bash
export PLAYWRIGHT_CLI_SESSION="mysession"
playwright-cli open example.com # Uses "mysession" automatically
```
## Common Patterns
### Concurrent Scraping
```bash
#!/bin/bash
# Scrape multiple sites concurrently
# Start all browsers
playwright-cli -s=site1 open https://site1.com &
playwright-cli -s=site2 open https://site2.com &
playwright-cli -s=site3 open https://site3.com &
wait
# Take snapshots from each
playwright-cli -s=site1 snapshot
playwright-cli -s=site2 snapshot
playwright-cli -s=site3 snapshot
# Cleanup
playwright-cli close-all
```
### A/B Testing Sessions
```bash
# Test different user experiences
playwright-cli -s=variant-a open "https://app.com?variant=a"
playwright-cli -s=variant-b open "https://app.com?variant=b"
# Compare
playwright-cli -s=variant-a screenshot
playwright-cli -s=variant-b screenshot
```
### Persistent Profile
By default, browser profile is kept in memory only. Use `--persistent` flag on `open` to persist the browser profile to disk:
```bash
# Use persistent profile (auto-generated location)
playwright-cli open https://example.com --persistent
# Use persistent profile with custom directory
playwright-cli open https://example.com --profile=/path/to/profile
```
## Default Browser Session
When `-s` is omitted, commands use the default browser session:
```bash
# These use the same default browser session
playwright-cli open https://example.com
playwright-cli snapshot
playwright-cli close # Stops default browser
```
## Browser Session Configuration
Configure a browser session with specific settings when opening:
```bash
# Open with config file
playwright-cli open https://example.com --config=.playwright/my-cli.json
# Open with specific browser
playwright-cli open https://example.com --browser=firefox
# Open in headed mode
playwright-cli open https://example.com --headed
# Open with persistent profile
playwright-cli open https://example.com --persistent
```
## Best Practices
### 1. Name Browser Sessions Semantically
```bash
# GOOD: Clear purpose
playwright-cli -s=github-auth open https://github.com
playwright-cli -s=docs-scrape open https://docs.example.com
# AVOID: Generic names
playwright-cli -s=s1 open https://github.com
```
### 2. Always Clean Up
```bash
# Stop browsers when done
playwright-cli -s=auth close
playwright-cli -s=scrape close
# Or stop all at once
playwright-cli close-all
# If browsers become unresponsive or zombie processes remain
playwright-cli kill-all
```
### 3. Delete Stale Browser Data
```bash
# Remove old browser data to free disk space
playwright-cli -s=oldsession delete-data
```

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# Storage Management
Manage cookies, localStorage, sessionStorage, and browser storage state.
## Storage State
Save and restore complete browser state including cookies and storage.
### Save Storage State
```bash
# Save to auto-generated filename (storage-state-{timestamp}.json)
playwright-cli state-save
# Save to specific filename
playwright-cli state-save my-auth-state.json
```
### Restore Storage State
```bash
# Load storage state from file
playwright-cli state-load my-auth-state.json
# Reload page to apply cookies
playwright-cli open https://example.com
```
### Storage State File Format
The saved file contains:
```json
{
"cookies": [
{
"name": "session_id",
"value": "abc123",
"domain": "example.com",
"path": "/",
"expires": 1735689600,
"httpOnly": true,
"secure": true,
"sameSite": "Lax"
}
],
"origins": [
{
"origin": "https://example.com",
"localStorage": [
{ "name": "theme", "value": "dark" },
{ "name": "user_id", "value": "12345" }
]
}
]
}
```
## Cookies
### List All Cookies
```bash
playwright-cli cookie-list
```
### Filter Cookies by Domain
```bash
playwright-cli cookie-list --domain=example.com
```
### Filter Cookies by Path
```bash
playwright-cli cookie-list --path=/api
```
### Get Specific Cookie
```bash
playwright-cli cookie-get session_id
```
### Set a Cookie
```bash
# Basic cookie
playwright-cli cookie-set session abc123
# Cookie with options
playwright-cli cookie-set session abc123 --domain=example.com --path=/ --httpOnly --secure --sameSite=Lax
# Cookie with expiration (Unix timestamp)
playwright-cli cookie-set remember_me token123 --expires=1735689600
```
### Delete a Cookie
```bash
playwright-cli cookie-delete session_id
```
### Clear All Cookies
```bash
playwright-cli cookie-clear
```
### Advanced: Multiple Cookies or Custom Options
For complex scenarios like adding multiple cookies at once, use `run-code`:
```bash
playwright-cli run-code "async page => {
await page.context().addCookies([
{ name: 'session_id', value: 'sess_abc123', domain: 'example.com', path: '/', httpOnly: true },
{ name: 'preferences', value: JSON.stringify({ theme: 'dark' }), domain: 'example.com', path: '/' }
]);
}"
```
## Local Storage
### List All localStorage Items
```bash
playwright-cli localstorage-list
```
### Get Single Value
```bash
playwright-cli localstorage-get token
```
### Set Value
```bash
playwright-cli localstorage-set theme dark
```
### Set JSON Value
```bash
playwright-cli localstorage-set user_settings '{"theme":"dark","language":"en"}'
```
### Delete Single Item
```bash
playwright-cli localstorage-delete token
```
### Clear All localStorage
```bash
playwright-cli localstorage-clear
```
### Advanced: Multiple Operations
For complex scenarios like setting multiple values at once, use `run-code`:
```bash
playwright-cli run-code "async page => {
await page.evaluate(() => {
localStorage.setItem('token', 'jwt_abc123');
localStorage.setItem('user_id', '12345');
localStorage.setItem('expires_at', Date.now() + 3600000);
});
}"
```
## Session Storage
### List All sessionStorage Items
```bash
playwright-cli sessionstorage-list
```
### Get Single Value
```bash
playwright-cli sessionstorage-get form_data
```
### Set Value
```bash
playwright-cli sessionstorage-set step 3
```
### Delete Single Item
```bash
playwright-cli sessionstorage-delete step
```
### Clear sessionStorage
```bash
playwright-cli sessionstorage-clear
```
## IndexedDB
### List Databases
```bash
playwright-cli run-code "async page => {
return await page.evaluate(async () => {
const databases = await indexedDB.databases();
return databases;
});
}"
```
### Delete Database
```bash
playwright-cli run-code "async page => {
await page.evaluate(() => {
indexedDB.deleteDatabase('myDatabase');
});
}"
```
## Common Patterns
### Authentication State Reuse
```bash
# Step 1: Login and save state
playwright-cli open https://app.example.com/login
playwright-cli snapshot
playwright-cli fill e1 "user@example.com"
playwright-cli fill e2 "password123"
playwright-cli click e3
# Save the authenticated state
playwright-cli state-save auth.json
# Step 2: Later, restore state and skip login
playwright-cli state-load auth.json
playwright-cli open https://app.example.com/dashboard
# Already logged in!
```
### Save and Restore Roundtrip
```bash
# Set up authentication state
playwright-cli open https://example.com
playwright-cli eval "() => { document.cookie = 'session=abc123'; localStorage.setItem('user', 'john'); }"
# Save state to file
playwright-cli state-save my-session.json
# ... later, in a new session ...
# Restore state
playwright-cli state-load my-session.json
playwright-cli open https://example.com
# Cookies and localStorage are restored!
```
## Security Notes
- Never commit storage state files containing auth tokens
- Add `*.auth-state.json` to `.gitignore`
- Delete state files after automation completes
- Use environment variables for sensitive data
- By default, sessions run in-memory mode which is safer for sensitive operations

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# Test Generation
Generate Playwright test code automatically as you interact with the browser.
## How It Works
Every action you perform with `playwright-cli` generates corresponding Playwright TypeScript code.
This code appears in the output and can be copied directly into your test files.
## Example Workflow
```bash
# Start a session
playwright-cli open https://example.com/login
# Take a snapshot to see elements
playwright-cli snapshot
# Output shows: e1 [textbox "Email"], e2 [textbox "Password"], e3 [button "Sign In"]
# Fill form fields - generates code automatically
playwright-cli fill e1 "user@example.com"
# Ran Playwright code:
# await page.getByRole('textbox', { name: 'Email' }).fill('user@example.com');
playwright-cli fill e2 "password123"
# Ran Playwright code:
# await page.getByRole('textbox', { name: 'Password' }).fill('password123');
playwright-cli click e3
# Ran Playwright code:
# await page.getByRole('button', { name: 'Sign In' }).click();
```
## Building a Test File
Collect the generated code into a Playwright test:
```typescript
import { test, expect } from '@playwright/test';
test('login flow', async ({ page }) => {
// Generated code from playwright-cli session:
await page.goto('https://example.com/login');
await page.getByRole('textbox', { name: 'Email' }).fill('user@example.com');
await page.getByRole('textbox', { name: 'Password' }).fill('password123');
await page.getByRole('button', { name: 'Sign In' }).click();
// Add assertions
await expect(page).toHaveURL(/.*dashboard/);
});
```
## Best Practices
### 1. Use Semantic Locators
The generated code uses role-based locators when possible, which are more resilient:
```typescript
// Generated (good - semantic)
await page.getByRole('button', { name: 'Submit' }).click();
// Avoid (fragile - CSS selectors)
await page.locator('#submit-btn').click();
```
### 2. Explore Before Recording
Take snapshots to understand the page structure before recording actions:
```bash
playwright-cli open https://example.com
playwright-cli snapshot
# Review the element structure
playwright-cli click e5
```
### 3. Add Assertions Manually
Generated code captures actions but not assertions. Add expectations in your test:
```typescript
// Generated action
await page.getByRole('button', { name: 'Submit' }).click();
// Manual assertion
await expect(page.getByText('Success')).toBeVisible();
```

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# Tracing
Capture detailed execution traces for debugging and analysis. Traces include DOM snapshots, screenshots, network activity, and console logs.
## Basic Usage
```bash
# Start trace recording
playwright-cli tracing-start
# Perform actions
playwright-cli open https://example.com
playwright-cli click e1
playwright-cli fill e2 "test"
# Stop trace recording
playwright-cli tracing-stop
```
## Trace Output Files
When you start tracing, Playwright creates a `traces/` directory with several files:
### `trace-{timestamp}.trace`
**Action log** - The main trace file containing:
- Every action performed (clicks, fills, navigations)
- DOM snapshots before and after each action
- Screenshots at each step
- Timing information
- Console messages
- Source locations
### `trace-{timestamp}.network`
**Network log** - Complete network activity:
- All HTTP requests and responses
- Request headers and bodies
- Response headers and bodies
- Timing (DNS, connect, TLS, TTFB, download)
- Resource sizes
- Failed requests and errors
### `resources/`
**Resources directory** - Cached resources:
- Images, fonts, stylesheets, scripts
- Response bodies for replay
- Assets needed to reconstruct page state
## What Traces Capture
| Category | Details |
|----------|---------|
| **Actions** | Clicks, fills, hovers, keyboard input, navigations |
| **DOM** | Full DOM snapshot before/after each action |
| **Screenshots** | Visual state at each step |
| **Network** | All requests, responses, headers, bodies, timing |
| **Console** | All console.log, warn, error messages |
| **Timing** | Precise timing for each operation |
## Use Cases
### Debugging Failed Actions
```bash
playwright-cli tracing-start
playwright-cli open https://app.example.com
# This click fails - why?
playwright-cli click e5
playwright-cli tracing-stop
# Open trace to see DOM state when click was attempted
```
### Analyzing Performance
```bash
playwright-cli tracing-start
playwright-cli open https://slow-site.com
playwright-cli tracing-stop
# View network waterfall to identify slow resources
```
### Capturing Evidence
```bash
# Record a complete user flow for documentation
playwright-cli tracing-start
playwright-cli open https://app.example.com/checkout
playwright-cli fill e1 "4111111111111111"
playwright-cli fill e2 "12/25"
playwright-cli fill e3 "123"
playwright-cli click e4
playwright-cli tracing-stop
# Trace shows exact sequence of events
```
## Trace vs Video vs Screenshot
| Feature | Trace | Video | Screenshot |
|---------|-------|-------|------------|
| **Format** | .trace file | .webm video | .png/.jpeg image |
| **DOM inspection** | Yes | No | No |
| **Network details** | Yes | No | No |
| **Step-by-step replay** | Yes | Continuous | Single frame |
| **File size** | Medium | Large | Small |
| **Best for** | Debugging | Demos | Quick capture |
## Best Practices
### 1. Start Tracing Before the Problem
```bash
# Trace the entire flow, not just the failing step
playwright-cli tracing-start
playwright-cli open https://example.com
# ... all steps leading to the issue ...
playwright-cli tracing-stop
```
### 2. Clean Up Old Traces
Traces can consume significant disk space:
```bash
# Remove traces older than 7 days
find .playwright-cli/traces -mtime +7 -delete
```
## Limitations
- Traces add overhead to automation
- Large traces can consume significant disk space
- Some dynamic content may not replay perfectly

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# Video Recording
Capture browser automation sessions as video for debugging, documentation, or verification. Produces WebM (VP8/VP9 codec).
## Basic Recording
```bash
# Open browser first
playwright-cli open
# Start recording
playwright-cli video-start demo.webm
# Add a chapter marker for section transitions
playwright-cli video-chapter "Getting Started" --description="Opening the homepage" --duration=2000
# Navigate and perform actions
playwright-cli goto https://example.com
playwright-cli snapshot
playwright-cli click e1
# Add another chapter
playwright-cli video-chapter "Filling Form" --description="Entering test data" --duration=2000
playwright-cli fill e2 "test input"
# Stop and save
playwright-cli video-stop
```
## Best Practices
### 1. Use Descriptive Filenames
```bash
# Include context in filename
playwright-cli video-start recordings/login-flow-2024-01-15.webm
playwright-cli video-start recordings/checkout-test-run-42.webm
```
### 2. Record entire hero scripts.
When recording a video for the user or as a proof of work, it is best to create a code snippet and execute it with run-code.
It allows pulling appropriate pauses between the actions and annotating the video. There are new Playwright APIs for that.
1) Perform scenario using CLI and take note of all locators and actions. You'll need those locators to request thier bounding boxes for highlight.
2) Create a file with the intended script for video (below). Use pressSequentially w/ delay for nice typing, make reasonable pauses.
3) Use playwright-cli run-code --file your-script.js
**Important**: Overlays are `pointer-events: none` — they do not interfere with page interactions. You can safely keep sticky overlays visible while clicking, filling, or performing any actions on the page.
```js
async page => {
await page.screencast.start({ path: 'video.webm', size: { width: 1280, height: 800 } });
await page.goto('https://demo.playwright.dev/todomvc');
// Show a chapter card — blurs the page and shows a dialog.
// Blocks until duration expires, then auto-removes.
// Use this for simple use cases, but always feel free to hand-craft your own beautiful
// overlay via await page.screencast.showOverlay().
await page.screencast.showChapter('Adding Todo Items', {
description: 'We will add several items to the todo list.',
duration: 2000,
});
// Perform action
await page.getByRole('textbox', { name: 'What needs to be done?' }).pressSequentially('Walk the dog', { delay: 60 });
await page.getByRole('textbox', { name: 'What needs to be done?' }).press('Enter');
await page.waitForTimeout(1000);
// Show next chapter
await page.screencast.showChapter('Verifying Results', {
description: 'Checking the item appeared in the list.',
duration: 2000,
});
// Add a sticky annotation that stays while you perform actions.
// Overlays are pointer-events: none, so they won't block clicks.
const annotation = await page.screencast.showOverlay(`
<div style="position: absolute; top: 8px; right: 8px;
padding: 6px 12px; background: rgba(0,0,0,0.7);
border-radius: 8px; font-size: 13px; color: white;">
✓ Item added successfully
</div>
`);
// Perform more actions while the annotation is visible
await page.getByRole('textbox', { name: 'What needs to be done?' }).pressSequentially('Buy groceries', { delay: 60 });
await page.getByRole('textbox', { name: 'What needs to be done?' }).press('Enter');
await page.waitForTimeout(1500);
// Remove the annotation when done
await annotation.dispose();
// You can also highlight relevant locators and provide contextual annotations.
const bounds = await page.getByText('Walk the dog').boundingBox();
await page.screencast.showOverlay(`
<div style="position: absolute;
top: ${bounds.y}px;
left: ${bounds.x}px;
width: ${bounds.width}px;
height: ${bounds.height}px;
border: 1px solid red;">
</div>
<div style="position: absolute;
top: ${bounds.y + bounds.height + 5}px;
left: ${bounds.x + bounds.width / 2}px;
transform: translateX(-50%);
padding: 6px;
background: #808080;
border-radius: 10px;
font-size: 14px;
color: white;">Check it out, it is right above this text
</div>
`, { duration: 2000 });
await page.screencast.stop();
}
```
Embrace creativity, overlays are powerful.
### Overlay API Summary
| Method | Use Case |
|--------|----------|
| `page.screencast.showChapter(title, { description?, duration?, styleSheet? })` | Full-screen chapter card with blurred backdrop — ideal for section transitions |
| `page.screencast.showOverlay(html, { duration? })` | Custom HTML overlay — use for callouts, labels, highlights |
| `disposable.dispose()` | Remove a sticky overlay added without duration |
| `page.screencast.hideOverlays()` / `page.screencast.showOverlays()` | Temporarily hide/show all overlays |
## Tracing vs Video
| Feature | Video | Tracing |
|---------|-------|---------|
| Output | WebM file | Trace file (viewable in Trace Viewer) |
| Shows | Visual recording | DOM snapshots, network, console, actions |
| Use case | Demos, documentation | Debugging, analysis |
| Size | Larger | Smaller |
## Limitations
- Recording adds slight overhead to automation
- Large recordings can consume significant disk space