Contact emails
luigo...@microsoft.com<mailto:luigo...@microsoft.com>, 
habenf...@microsoft.com<mailto:habenf...@microsoft.com>

Explainer
https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/DocumentSubtitle/explainer.md#html-document-subtitle-fix-installed-web-app-title-bar-text

Specification
https://github.com/whatwg/html/compare/main...diekus:html:main

Design docs

https://docs.google.com/document/d/1RFooPMsNJWoMifLU71GQysTC86BYdyKTCMcDIos3IGs/edit?usp=sharing

Summary

Installed web apps can change the text on the title bar based on the page's 
content. The current behavior is that the installed web application will put 
the app's name from the manifest and append the page’s inner text from the 
`<title>` HTML tag in the head of the page. This often can create awkward 
titles for some web apps. This feature allows to specify complementary 
information about the current window of an installed running PWA. It adds a 
subtitle to the page to provide contextual information that is displayed in the 
window's title bar. This replaces the text contained in the HTML's title tag.


Blink component
UI>Browser>WebAppInstalls<https://bugs.chromium.org/p/chromium/issues/list?q=component:UI%3EBrowser%3EWebAppInstalls>

TAG review
https://github.com/w3ctag/design-reviews/issues/819

TAG review status
Pending

Risks


Interoperability and Compatibility

There are no interoperability and compatibility risks.


Gecko: Defer (https://github.com/mozilla/standards-positions/issues/749)

WebKit: No signal (https://github.com/WebKit/standards-positions/issues/138)

Web developers: Positive

Other signals:

Security

https://docs.google.com/document/d/1CwYQEf98fI5z96Y6AsQdSafp70SD5STgepD5Z8cx1HQ/edit


WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that it 
has potentially high risk for Android WebView-based applications?


Goals for experimentation


Ongoing technical constraints


Debuggability

The DOM inspection in DevTools is sufficient.


Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, 
ChromeOS, Android, and Android WebView)?
No

This is a feature that works on desktop scenarios (Windows, Linux, MacOS), 
mobile platforms don't make use of it.


Is this feature fully tested by 
web-platform-tests<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?
No

DevTrial instructions
https://docs.google.com/document/d/1eXZquhI7E2InQxETrdxjORKH0SfD4DkHAwdIpxuZ150/edit?usp=sharing

Flag name on chrome://flags
#enable-desktop-pwas-app-title

Finch feature name


Non-finch justification
None

Requires code in //chrome?
False

Tracking bug
https://bugs.chromium.org/p/chromium/issues/detail?id=1351682

Estimated milestones
DevTrial on desktop
123


Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5168096826884096

Links to previous Intent discussions
Intent to prototype: 
https://groups.google.com/a/chromium.org/g/blink-dev/c/YbQQdVB19ws/m/NoA-TC9XCAAJ

This intent message was generated by Chrome Platform 
Status<https://chromestatus.com/>.


Diego González
Senior Product Manager
Microsoft Edge

[cid:db871fb6-79c0-44bb-9bcd-1f776f6a6360]

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