New to DevTools in Chrome 68:
- Eager Evaluation. As you type expressions, the Console previews the result.
- Argument hints. As you type functions, the Console shows you the expected arguments for that function.
- Function autocompletion. After typing a function call such as
document.querySelector('p'), the Console shows you the functions and properties that the return value supports.
- ES2017 keywords in the Console. Keywords such as
awaitare now available in the Console's autocomplete UI.
- Lighthouse 3.0 in the Audits panel. Faster, more consistent audits, a new UI, and new audits.
- Adding property paths to the Watch pane. Add properties from the Scope pane to the Watch pane.
- "Show timestamps" moved to Settings.
Read on, or watch the video version of the release notes, below.
Chrome 68 ships with a few new Console features related to autocompletion and previewing.
When you type an expression in the Console, the Console can now show a preview of the result of that expression below your cursor.
To enable Eager Evaluation:
- Open the Console.
- Open Console Settings .
- Enable the Eager evaluation checkbox.
DevTools does not eager evaluate if the expression causes side effects.
As you're typing out functions, the Console now shows you the arguments that the function expects.
- A question mark before an arg, such as
?options, represents an optional arg.
- An ellipsis before an arg, such as
...items, represents a spread.
- Some functions, such as
CSS.supports(), accept multiple argument signatures.
Autocomplete after function executions
After enabling Eager Evaluation, the Console now also shows you which properties and functions are available after you type out a function.
ES2017 keywords in autocomplete
ES2017 keywords, such as
await, are now available in the Console's autocomplete UI.
Faster, more reliable audits, a new UI, and new audits
Chrome 68 ships with Lighthouse 3.0. The next sections are a roundup of some of the biggest changes. See Announcing Lighthouse 3.0 for the full story.
Faster, more reliable audits
Lighthouse 3.0 has a new internal auditing engine, codenamed Lantern, which completes your audits faster, and with less variance between runs.
Lighthouse 3.0 also brings a new UI, thanks to a collaboration between the Lighthouse and Chrome UX (Research & Design) teams.
Lighthouse 3.0 also ships with 4 new audits:
- First Contentful Paint
- robots.txt is not valid
- Use video formats for animated content
- Avoid multiple, costly round trips to any origin
Chrome 68 supports a new numeric primitive called
BigInt lets you represent
integers with arbitrary precision. Try it out in the Console:
Add property path to watch
While paused on a breakpoint, right-click a property in the Scope pane and select Add property path to watch to add that property to the Watch pane.
"Show timestamps" moved to settings
The Show timestamps checkbox previously in Console Settings has moved to Settings.
To discuss the new features and changes in this post, or anything else related to DevTools:
- File bug reports at Chromium Bugs.
- Discuss features and changes on the Mailing List. Please don't use the mailing list for support questions. Use Stack Overflow, instead.
- Get help on how to use DevTools on Stack Overflow. Please don't file bugs on Stack Overflow. Use Chromium Bugs, instead.
- Tweet us at @ChromeDevTools.
- File bugs on this doc in the Web Fundamentals repository.
If you're on Mac or Windows, please consider using Chrome Canary as your default development browser. If you report a bug or a change that you don't like while it's still in Canary, the DevTools team can address your feedback significantly faster.
Discover other DevTools features
Below is a list of everything that's been covered in the What's New In DevTools series.
- 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