Emulate vision deficiencies
Open the Rendering tab and use the new Emulate vision deficiencies feature to get a better idea of how people with different types of vision deficiencies experience your site.
DevTools can emulate blurred vision and the following types of color vision deficiencies:
- Protanopia: the inability to perceive any red light.
- Deuteranopia: the inability to perceive any green light.
- Tritanopia: the inability to perceive any blue light.
- Achromatopsia: the inability to perceive any color except for shades of grey (extremely rare).
Less extreme versions of these color vision deficiencies exist, and in fact they are more common. For example, protanomaly is a reduced sensitivity to red light (as opposed to protanopia, which is the complete inability to perceive red light). However, these “-omaly” vision deficiencies are not as clearly defined: every person with such a vision deficiency is different and might see things differently (being able to perceive more/less of the relevant colors).
By designing for the more extreme simulations in DevTools, your web apps are guaranteed to be accessible to people with protanomaly, deuteranomaly, tritanomaly, and achromatomaly as well.
Send feedback to Chromium issue #1003700.
You can now emulate locales by setting
navigator.language in the Console or
by setting a location in Sensors > Location. Open the Command Menu and
Sensors to access the Sensors tab. After performing these actions
DevTools modifies the
Accept-Language HTTP request header to match your emulated location.
Check out Locale-dependent code example to try it yourself.
Send feedback to Chromium issue #1051822.
Cross-Origin Opener Policy (COOP) and Cross-Origin Embedder Policy (COEP) debugging
The Status column now provides a quick explanation of why a request was blocked as well as a link to view that request's headers for further debugging:
The Response Headers section of the Headers tab provides more guidance on how to resolve the issues:
Send feedback to Chromium issue #1051466.
New icons for breakpoints, conditional breakpoints, and logpoints
The Sources panel has new icons for breakpoints, conditional breakpoints, and logpoints:
- Breakpoints are represented by red circles.
- Conditional Breakpoints are represented by half-red half-white circles.
- Logpoints are represented by red squares with Console icons.
The motivation for the new icons was to make the UI more consistent with other GUI debugging tools (which usually color breakpoints red) and to make it easier to distinguish between the 3 features at a glance.
Send feedback to Chromium issue #1041830.
View network requests that set a specific cookie
Use the new
cookie-path filter keyword in the Network panel to focus on
the network requests that set a specific cookie path.
Check out Filter requests by properties to discover more special keywords
Dock to left from the Command Menu
Open the Command Menu and run the
Dock to left
command to move DevTools to the left of your viewport.
Send feedback to Chromium issue #1011679.
Settings option in the Main Menu has moved
The option for opening Settings from the Main Menu can now be found under More Tools.
Send feedback to Chromium issue #1050855.
The Audits panel is now the Lighthouse panel
The DevTools and Lighthouse teams frequently got feedback from web developers that they would hear that it's possible to run Lighthouse from DevTools, but when they went to try it out they couldn't find the "Lighthouse" panel, so the Audits panel is now the Lighthouse panel.
Delete all Local Overrides in a folder
After setting up Local Overrides you can now right-click a folder and select the new Delete all overrides option to delete all Local Overrides in that folder.
Send feedback to Chromium issue #1016501.
Updated Long tasks UI
You've been able to visualize Long Tasks in the Performance panel for a while now, but in Chrome 83 the Long Task visualization UI in the Performance panel has been updated. The Long Task portion of a task is now colored with a striped red background.
Send feedback to Chromium issue #1054447.
Maskable icon support in the Manifest pane
Android Oreo introduced adaptive icons, which display app icons in a variety of shapes across different device models. Maskable icons are a new icon format that support adaptive icons, which enable you to ensure that your PWA icon looks good on devices that support the maskable icons standard.
Enable the new Show only the minimum safe area for maskable icons checkbox in the Manifest pane to check that your maskable icon will look good on Android Oreo devices. Check out Are my current icons ready? to learn more.
To discuss the new features and changes in this post, or anything else related to DevTools:
- File definite bug reports and feature requests at Chromium Bugs.
- Discuss possible features, changes, and bugs on the Mailing List.
- Get help on how to use DevTools on Stack Overflow.
- Tweet us at @ChromeDevTools.
- File bugs on this document in the Web Fundamentals repository.
If you're on Mac or Windows, consider using Chrome Canary as your default development browser. Canary gives you access to the latest DevTools features.
Discover other DevTools features
Below is a list of everything that's been covered in the What's New In DevTools series.
- Emulate vision deficiencies
- Emulate locales
- Cross-Origin Opener Policy (COOP) and Cross-Origin Embedder Policy (COEP) debugging
- New icons for breakpoints, conditional breakpoints, and logpoints
- View network requests that set a specific cookie
- Dock to left from the Command Menu
- The Settings option in the Main Menu has moved
- The Audits panel is now the Lighthouse panel
- Delete all Local Overrides in a folder
- Updated Long Tasks UI
- Maskable icon support in the Manifest pane
- Moto G4 support in Device Mode
- Cookie-related updates
- More accurate web app manifest icons
- Hover over CSS
contentproperties to see unescaped values
- Source map errors in the Console
- Setting for disabling scrolling past the end of a file
- Support for
classredeclarations in the Console
- Improved WebAssembly debugging
- Request Initiator Chains in the Initiator tab
- Highlight the selected network request in the Overview
- URL and path columns in the Network panel
- Updated User-Agent strings
- New Audits panel configuration UI
- Per-function or per-block code coverage modes
- Code coverage must now be initiated by a page reload
- Debug why a cookie was blocked
- View cookie values
- Simulate different prefers-color-scheme and prefers-reduced-motion preferences
- Code coverage updates
- Debug why a network resource was requested
- Console and Sources panels respect indentation preferences again
- New shortcuts for cursor navigation
- Multi-client support in the Audits panel
- Payment Handler debugging
- Lighthouse 5.2 in the Audits panel
- Largest Contentful Paint in the Performance panel
- File DevTools issues from the Main Menu
- Copy element styles
- Visualize layout shifts
- Lighthouse 5.1 in the Audits panel
- OS theme syncing
- Keyboard shortcut for opening the Breakpoint Editor
- Prefetch cache in the Network panel
- Private properties when viewing objects
- Notifications and push messages in the Application panel
- Autocomplete with CSS values
- A new UI for network settings
- WebSocket messages in HAR exports
- HAR import and export buttons
- Real-time memory usage
- Service worker registration port numbers
- Inspect Background Fetch and Background Sync events
- Puppeteer for Firefox
- Meaningful presets when autocompleting CSS functions
- Clear site data from the Command Menu
- View all IndexedDB databases
- View a resource's uncompressed size on hover
- Inline breakpoints in the Breakpoints pane
- IndexedDB and Cache resource counts
- Setting for disabling the detailed Inspect tooltip
- Setting for toggling tab indentation in the Editor
- Highlight all nodes affected by CSS property
- Lighthouse v4 in the Audits panel
- WebSocket binary message viewer
- Capture area screenshot in the Command Menu
- Service worker filters in the Network panel
- Performance panel updates
- Long tasks in Performance panel recordings
- First Paint in the Timing section
- Bonus tip: Shortcut for viewing RGB and HSL color codes (video)
- Detailed tooltips in Inspect Mode
- Export code coverage data
- Navigate the Console with a keyboard
- AAA contrast ratio line in the Color Picker
- Save custom geolocation overrides
- Code folding
- Frames tab renamed to Messages tab
- Bonus tip: Network panel filtering by property (video)
- Visualize performance metrics in the Performance panel
- Highlight text nodes in the DOM Tree
- Copy the JS path to a DOM node
- Audits panel updates, including a new audit that detects JS libraries and new keywords for accessing the Audits panel from the Command Menu
- Bonus tip: Use Device Mode to inspect media queries (video)
- Hover over a Live Expression result to highlight a DOM node
- Store DOM nodes as global variables
- Initiator and priority information now in HAR imports and exports
- Access the Command Menu from the Main Menu
- Picture-in-Picture breakpoints
- Bonus tip: Use
monitorEvents()to log a node's fired events in the Console (video)
- Live Expressions in the Console
- Highlight DOM nodes during Eager Evaluation
- Performance panel optimizations
- More reliable debugging
- Enable network throttling from the Command Menu
- Autocomplete Conditional Breakpoints
- Break on AudioContext events
- Debug Node.js apps with ndb
- Bonus tip: Measure real world user interactions with the User Timing API
- Eager Evaluation
- Argument hints
- Function autocompletion
- ES2017 keywords
- Lighthouse 3.0 in the Audits panel
- BigInt support
- Adding property paths to the Watch pane
- "Show timestamps" moved to Settings
- Bonus tip: Lesser-known Console methods (video)
- Search across all network headers
- CSS variable value previews
- Copy as fetch
- New audits, desktop configuration options, and viewing traces
- Stop infinite loops
- User Timing in the Performance tabs
- Network tab renamed to Page tab
- Dark theme updates
- Certificate transparency information in the Security panel
- Site isolation features in the Performance panel
- Bonus tip: Layers panel + Animations Inspector (video)
- Blackboxing in the Network panel
- Auto-adjust zooming in Device Mode
- Pretty-printing in the Preview and Response tabs
- Previewing HTML content in the Preview tab
- Local Overrides support for styles inside of HTML
- Bonus tip: Blackbox framework scripts to make Event Listener Breakpoints more useful
- Local Overrides
- New accessibility tools
- The Changes tab
- New SEO and performance audits
- Multiple recordings in the Performance panel
- Reliable code stepping with workers in async code
- Bonus tip: Automate DevTools actions with Puppeteer (video)
- Performance Monitor
- Console Sidebar
- Group similar Console messages
- Bonus tip: Toggle hover pseudo-class (video)
- Multi-client remote debugging support
- Workspaces 2.0
- 4 new audits
- Simulate push notifications with custom data
- Trigger background sync events with custom tags
- Bonus tip: Event listener breakpoints (video)
- Top-level await in the Console
- New screenshot workflows
- CSS Grid highlighting
- A new Console API for querying objects
- New Console filters
- HAR imports in the Network panel
- Previewable cache resources
- More predictable cache debugging
- Block-level code coverage
- Mobile device throttling simulation
- View storage usage
- View when a service worker cached responses
- Enable the FPS meter from the Command Menu
- Set mousewheel behavior to zoom or scroll
- Debugging support for ES6 modules
- New Audits panel
- 3rd-Party Badges
- A new gesture for Continue To Here
- Step into async
- More informative object previews in the Console
- More informative context selection in the Console
- Real-time updates in the Coverage tab
- Simpler network throttling options
- Async stacks on by default
- CSS and JS code coverage
- Full-page screenshots
- Block requests
- Step over async await
- Unified Command Menu