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💡 Newskategorie: Programmierung
🔗 Quelle: developers.google.com
What's New In DevTools (Chrome 86)
New Media panel
DevTools now displays media players information in the Media panel.
Prior to the new media panel in DevTools, logging and debug information
about video players could be found in chrome://media-internals.
The new Media panel provides an easier way to view events, logs, properties, and a timeline of frame decodes in the same browser tab as the video player itself. You can live view and inspect on potential issues quicker (e.g. why dropped frames are occurring, why JavaScript is interacting with the player in an unexpected way).
Chromium issue: 1018414
Capture node screenshots via Elements panel context menu
You can now capture node screenshots via the context menu in the Elements panel.
For example, you can take a screenshot of the table of content by right clicking the element and select Capture node screenshot.
Chromium issue: 1100253
Issues tab updates
The Issues warning bar on the Console panel is now replaced with a regular message.
Third-party cookie issues are now hidden by default in the Issues tab. Enable the new Include third-party cookie issues checkbox to view them.
Chromium issues: 1096481, 1068116, 1080589
Emulate missing local fonts
Open the Rendering tab and use the new Disable local fonts feature to emulate missing local() sources in @font-face rules.
For example, when the font “Rubik” is installed on your device and the @font-face src rule uses it as a local() font, Chrome uses the local font file from your device.
When Disable local fonts is enabled, DevTools ignores the local() fonts and fetches them from the network.
Chromium issue: 384968
Emulate inactive users
The Idle Detection API allows developers to detect inactive users and react on idle state changes. You can now use DevTools to emulate idle state changes in the Sensors tab for both the user state and the screen state instead of waiting for the actual idle state to change. You can open the Sensors tab from the Drawer.
Chromium issue: 1090802
Emulate prefers-reduced-data
The prefers-reduced-data media query detects if the user prefers being served alternate content that uses less data for the page to be rendered.
You can now use DevTools to emulate the prefers-reduced-data media query.
Chromium issue: 1096068
Support for new JavaScript features
DevTools now has better support for some of the latest JavaScript language features:
- Logical assignment operators - DevTools now supports logical assignment with the new operators
&&=,||=, and??=in the Console and Sources panels. - Pretty-print numeric separators - DevTools now properly pretty-prints the numeric separators in the Sources panel.
Chromium issues: 1086817, 1080569
Lighthouse 6.2 in the Lighthouse panel
The Lighthouse panel is now running Lighthouse 6.2. Check out the release notes for a full list of changes.
New audits in Lighthouse 6.2:
- Avoid long main thread tasks. Reports the longest tasks on the main thread, useful for identifying worst contributors to input delay.
- Links are crawlable. Check if the
hrefattribute of anchor elements links to an appropriate destination, so the links can be discovered. - Unsized image elements - Check if an explicit
widthandheightis set on image elements. Explicit image size can reduce layout shifts and improve CLS. - Avoid non-composited animations. Reports non-composited animations that appear janky and reduce CLS.
- Listens for the
unloadevents. Reports theunloadevent. Consider using thepagehideorvisibilitychangeevents instead as theunloadevent does not fire reliably.
Updated audits in Lighthouse 6.2:
- Remove unused JavaScript. Lighthouse will now enhance the audit if a page has publicly-accessible JavaScript source maps.
Chromium issue: 772558
Deprecation of “other origins” listing in the Service Workers pane
DevTools now provides a link to view the full list of service workers from other origins in a new browser tab - chrome://serviceworker-internals/?devtools.
Previously DevTools displayed a list nested under the Application panel > Service workers pane.
Chromium issue: 807440
Show coverage summary for filtered items
DevTools now recalculates and displays a summary of coverage information dynamically when filters are applied in the Coverage tab. Previously, the Coverage tab always displayed a summary of all coverage information.
In the example below notice how the summary initially says
446 kB of 2.0 MB (22%) used so far. 1.5 MB unused. and then says
57 kB of 604 kB (10%) used so far. 546 kB unused. after CSS filtering has been applied.
Chromium issue: 1061385
New frame detailed view in Application panel
DevTools now show a detailed view for each frame. Access it by clicking a frame under the Frames menu in the Application panel.
Chromium issue: 1093247
Frame details for opened windows
DevTools now displays opened windows / pop-ups under the frame tree as well. The frame detailed view of the opened windows includes additional security information.
More security information will be added to the frame detailed view soon.
Chromium issue: 1107766
Elements and Network panel updates
Accessible color suggestion in the Styles pane
DevTools now provides color suggestions for low color contrast text.
In the example below, h1 has low contrast text. To fix it, open the color picker of the color
property in the Styles pane. After you expand the Contrast ratio section, DevTools
provides AA and AAA color suggestions. Click on the suggested color to apply the color.
Chromium issue: 1093227
Human-readable X-Client-Data header values in the Network panel
When inspecting a network resource in the Network panel, DevTools now formats any X-Client-Data header values in Headers pane as code.
The X-Client-Data HTTP header contains a list of experiment IDs and Chrome flags that are enabled in your browser. The raw header values look like opaque strings since they are base-64-encoded, serialized protocol buffers. To make the contents more transparent to developers, DevTools is now showing the decoded values.
Chromium issue: 1103854
Auto-complete custom fonts in the Styles pane
Imported font faces are now added to the list of CSS auto-completion when editing the font-family property in the Styles pane.
In this example, 'Noto Sans' is a custom font installed in the local machine. It is displayed in the CSS completion list. Previously, it was not.
Chromium issue: 1106221
Consistently display resource type in Network panel
DevTools now consistently displays the same resource type as the original network request and appends / Redirect to the Type column value when redirection (status 302) happens.
Previously DevTools changed the type to Other sometimes.
Chromium issue: 997694
Clear buttons in the Elements and Network panels
The filter text boxes in the Styles pane and Network panel, as well as the DOM search text box in the Elements panel, now have Clear buttons. Clicking Clear removes any text that you have input.
Chromium issue: 1067184
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