What’s New In DevTools (Chrome 71/84.0.4147.89)
Technical Writer, DevTools (Chrome 71) & Lighthouse
New features and major changes coming to Chrome DevTools in Chrome 71 include:
- Hover over a Live Expression 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) Run monitors events() in the Console to watch an element’s events fire
Read on, or watch the video version of this page:
When a Live Expression evaluates to a DOM node, hover over the Live Expression result to highlight that node in the viewport.
Figure 1. Hovering over a Live Expression result to highlight the node in the viewport
To store a DOM node as a global variable, run an expression in the Console that evaluates to a node, right-click the result, and then select Store as a global variable.
If you’d like to diagnose network logs with colleagues, you can export the network requests to a HAR file.
When you export a HAR file, DevTools now includes initiator and priority information in the HAR file. When you import HAR files back into DevTools, the Initiator and Priority columns are now populated.
The _initiator field provides more context around what caused the resource to be requested. This maps to the Initiator column in the Requests table.
The _priority field states what priority level the browser assigned to the resource. This maps to the Priority column in the Requests table, which is hidden by default.
You can now open the Command Menu from the Main Menu. Click the Main Menu button and select the Run command.
Enable the enterpictureinpicture, leave ctureinpicture, and resize checkboxes in the Event Listener Breakpoints pane to pause whenever one of these picture-in-picture events fires. DevTools pauses on the first line of the handler.
Suppose you want to add a red border around a button after focusing it and pressing R, E, D, but you don’t know what events to add listeners to. Use monitor events() to log all of the element’s events to the Console.
monitor events(temp1, [‘mouse’, ‘focus’]);
- 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
Note: Canary is released as soon as it is built, without testing. This means that Canary breaks about once-a-month. It’s usually fixed within a day. You can go back to using Chrome Stable while the Canary is broken.
Discover other DevTools features
Below is a list of everything that’s been covered in the What’s New In DevTools series.
- Visualize performance metrics 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.
- 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.
- Live Expressions in the Console.
- moreover, 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.
- in the first place search across all network headers.
- in like manner SS variable value previews.
- Copy as fetch.
- New audits, desktop configuration options, and viewing traces.
- not only … but also top infinite loops.
- as a matter of fact ser 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.
it is new and important
- Black boxing 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 the 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.
- Performance Monitor.
- Console Sidebar.
- Group similar Console messages.
- Multi-client remote debugging support.
- Workspaces 2.0.
- 4 new audits.
- Simulate push notifications with custom data.
- Trigger background sync events with custom tags.
62 this level is the console app. this is top-level to use chrome
- 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.
DevTools (Chrome 71)Chrome 61
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- Mobile device throttling simulation.
- View storage usage. moreover, View when a service worker cached responses.
- Enable the FPS Meter from the Command Menu.
- Set mouse wheel behavior to zoom or scroll.
- Debugging support for ES6 modules.
- by the same token ew Audits panel.
- 3rd-Party Badges.
- A new gesture for Continue To Here.
- Step into async.
- More informative object previews in the Console.
- equally important ore informative context selection in the Console.
- Real-time updates in the Coverage tab.
- to say nothing of simpler network throttling options.
- not to mention sync stacks on by default.
DevTools (Chrome 71)Chrome 59
and nowhere is last and good point
- in the light of SS and JS code coverage.
- Full-page screenshots.
- first, second, third lock requests.
- in the same fashion/way Steph over async-await.
- coupled with an ified Command Menu.
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