New features for cookies
Debug why a cookie was blocked
After recording network activity, select a network resource and then navigate to the updated Cookies tab to understand why that resource's request or response cookies were blocked. See Changes to the default behavior without SameSite to understand why you might be seeing more blocked cookies in Chrome 76 and later.

- Yellow Request Cookies were not sent over the wire. These are hidden by default. Click show filtered out request cookies to show them.
- Yellow Response Cookies were sent over the wire but not stored.
- Hover over More Information
to learn why a cookie was blocked.
- Most of the data in the Request Cookies and Response Cookies tables comes from the resource's HTTP headers. The Domain, Path, and Expires/Max-Age data comes from the Chrome DevTools Protocol.
Chromium issues #856777, #993843
View cookie values
Click a row in the Cookies pane to view the value of that cookie.

Chromium issue #462370
Simulate different prefers-color-scheme and prefers-reduced-motion preferences
The prefers-color-scheme media query lets you match
your site's style to your user's preferences. For example, if the prefers-color-scheme: dark
media query is true, it means that your user has set their operating system to dark mode and
prefers dark mode UIs.
Open the Command Menu, run the Show Rendering
command, and then set the Emulate CSS media feature prefers-color-scheme dropdown to debug
your prefers-color-scheme: dark
and prefers-color-scheme: light
styles.

prefers-color-scheme: dark
is set (middle box) the Styles pane (right box)
shows the CSS that gets applied when that media query is true and the viewport shows
the dark mode styles (left box).
You can also simulate prefers-reduced-motion: reduce
using the Emulate CSS media feature
prefers-reduced-motion dropdown next to the Emulate CSS media feature prefers-color-scheme
dropdown.
Chromium issue #1004246
Code coverage updates
The Coverage tab can help you find unused JavaScript and CSS.
The Coverage tab now uses new colors to represent used and unused code. This color combination is proven to be more accessible for people with color vision deficiencies. The red bar on the left represents unused code, and the bluish bar on the right represents used code.
The new coverage type filter text box lets you filter for coverage information by its type: display only JavaScript coverage, only CSS, or display all types of coverage.

The Sources panel displays code coverage data when it is available. Clicking the red or bluish marks next to the line number opens the Coverage tab and highlights the file.

Chromium issues #1003671, #1004185
Debug why a network resource was requested
After recording network activity, select a network resource and then navigate to the Initiator tab to understand why the resource was requested. The Request call stack section describes the JavaScript call stack leading up to the network request.

Chromium issues 963183, 842488
Console and Sources panels respect indentation preferences again
For a long time DevTools has had a setting to customize your indentation preference to 2 spaces, 4 spaces, 8 spaces, or tabs. Recently the setting was essentially useless because the Console and Sources panels were ignoring the setting. This bug is now fixed.
Go to Settings > Preferences > Sources > Default Indentation to set your preference.
Chromium issue #977394
New shortcuts for cursor navigation
Press Control+P in the Console or Sources panels to move your cursor to the line above. Press Control+N to move your cursor to the line below.
Chromium issue #983874
Feedback
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.
Consider Canary
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.
Chrome 80
- Support for
let
andclass
redeclarations 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
Chrome 79
- 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
Chrome 78
- 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
Chrome 77
- 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
Chrome 76
- 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
Chrome 75
- 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
Chrome 74
- 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)
Chrome 73
- Logpoints
- 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)
Chrome 72
- 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)
Chrome 71
- 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)
Chrome 70
- 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
Chrome 68
- 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)
Chrome 67
- 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
- JavaScript VM instances clearly listed in the Memory panel
- 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)
Chrome 66
- 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
Chrome 65
- 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)
Chrome 64
- Performance Monitor
- Console Sidebar
- Group similar Console messages
- Bonus tip: Toggle hover pseudo-class (video)
Chrome 63
- 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)
Chrome 62
- 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
Chrome 61
- 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
Chrome 60
- 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
Chrome 59
- CSS and JS code coverage
- Full-page screenshots
- Block requests
- Step over async await
- Unified Command Menu
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