Where is the list of abbreviations used in the standard? The term "UA" is used extensively throughout the text but not explained anywhere...

https://html.spec.whatwg.org/commit-snapshots/009a7316ad7f1b69de978101b043b9b29878d975/#table-of-contents

Please can you add Cross-Origin-Embedder-Policy and Cross-Origin-Opener-Policy to the /h5bp/security/ section.

More info: https://web.dev/coop-coep/

More info: https://developers.google.com/web/updates/2020/10/devtools#frame-details

As we want to add it to the apache header list.

Presumably these should result in a network error. The current specification doesn't state anything and it's not tested either.

See the README for instructions on where to add tests. In the specification the "blob" case of https://fetch.spec.whatwg.org/#scheme-fetch needs updating to handle current URL’s blob URL entry being null.

@sideshowbarker discovered that Chrome exposes delegatesFocus on ShadowRoot. This hasn't really appeared in any specification as far as I can tell (e.g., dglazkov-era's https://www.w3.org/TR/2015/WD-shadow-dom-20151215/#the-shadowroot-interface doesn't have it), but given that we expose other state that can be set when creating a shadow root, such as mode, it might well be reasonable to add.

Problem

The " Build ESP32 QEMU and Run Tests" task of the "QEMU / ESP32" test seems to fail randomly. It failed on project-chip/connectedhomeip#2009 for me, then passed when retriggered.

Proposed Solution

Figure out why it fails randomly and fix. Sadly the logs CI provides don't include the src/transport/tests/test-suite.log file that should have includ

https://url.spec.whatwg.org/commit-snapshots/2ce49383db3506a3c1a527a775693af1100198ef/#host-parsing

5. If input is the empty string, then return 0.

IPv4 parser calls IPv4 number parser in Step 6.2:

2. Let result be the result of parsing part.       <-- call to IPv4 number parser
3. If result is failure, then return input.
4. If result[1] is tr