- From: Keith Cirkel <notifications@github.com>
- Date: Thu, 29 Oct 2026 02:07:04 -0700
- To: whatwg/dom <dom@noreply.github.com>
- Cc: Subscribed <subscribed@noreply.github.com>
- Message-ID: <whatwg/dom/pull/1517@github.com>
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This adds the necessary machinery & steps to support custom attributes.
- [ ] At least two implementers are interested (and none opposed):
* …
* …
- [x] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
* https://github.com/web-platform-tests/wpt/pull/64342
- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
* Chromium: …
* Gecko: …
* WebKit: …
* Deno (only for aborting and events): …
* Node.js (only for aborting and events): …
- [ ] [MDN issue](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) is filed: …
- [ ] The top of this comment includes a [clear commit message](https://github.com/whatwg/meta/blob/main/COMMITTING.md) to use. <!-- If you created this PR from a single commit, Github copied its message. Otherwise, you need to add a commit message yourself. -->
(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)
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***
### :boom: Error: 422 Unprocessable Entity :boom: ###
[PR Preview](https://github.com/specinfra/pr-preview#pr-preview) failed to build. _(Last tried on Oct 29, 2026, 9:06 AM UTC)_.
<details>
<summary>More</summary>
PR Preview relies on a number of web services to run. There seems to be an issue with the following one:
:rotating_light: [Spec Generator](https://www.w3.org/publications/spec-generator/) - Spec Generator is the web service used to build bikeshed/ReSpec specs
:link: [Related URL](https://www.w3.org/publications/spec-generator/?type=bikeshed-spec&output=html&url=https%3A%2F%2Fraw.githubusercontent.com%2Fkeithamus%2Fdom%2F71880b90d53314aca285b973aa11838ea9e6ba47%2Fdom.bs&force=1&md-status=LS-PR&md-Text-Macro=PR-NUMBER%201517)
**Error output:**
```json
[
{
"lineNum": "3036:6",
"messageType": "link",
"text": "No 'dfn' refs found for 'is scoped' with for='['CustomAttributeRegistry']'."
},
{
"lineNum": "3039:6",
"messageType": "link",
"text": "No 'dfn' refs found for 'scoped document set' with for='['CustomAttributeRegistry']'."
},
{
"lineNum": "3047:8",
"messageType": "link",
"text": "No 'dfn' refs found for 'is scoped' with for='['CustomAttributeRegistry']'."
},
{
"lineNum": "3050:8",
"messageType": "link",
"text": "No 'dfn' refs found for 'scoped document set' with for='['CustomAttributeRegistry']'."
},
{
"lineNum": "3058:10",
"messageType": "link",
"text": "No 'dfn' refs found for 'enqueue a custom attribute callback reaction'."
},
{
"lineNum": "3062:25",
"messageType": "link",
"text": "No 'dfn' refs found for 'try to upgrade an attribute'."
},
{
"lineNum": "3067:11",
"messageType": "link",
"text": "No 'dfn' refs found for 'upgrade an attribute'."
},
{
"lineNum": "3250:4",
"messageType": "link",
"text": "No 'dfn' refs found for 'enqueue a custom attribute callback reaction'."
},
{
"lineNum": "3417:26",
"messageType": "link",
"text": "No 'dfn' refs found for 'enqueue a custom attribute callback reaction'."
},
{
"lineNum": "3434:4",
"messageType": "link",
"text": "No 'dfn' refs found for 'enqueue a custom attribute callback reaction'."
},
{
"lineNum": "~3485:1",
"messageType": "link",
"text": "No 'idl-name' refs found for 'CustomAttributeRegistry'."
},
{
"lineNum": "3500:21",
"messageType": "link",
"text": "No 'idl' refs found for 'CustomAttributeRegistry'."
},
{
"lineNum": "5125:31",
"messageType": "link",
"text": "No 'idl' refs found for 'CustomAttributeRegistry'."
},
{
"lineNum": "5212:44",
"messageType": "link",
"text": "No 'idl' refs found for 'CustomAttributeRegistry'."
},
{
"lineNum": "5289:6",
"messageType": "link",
"text": "No 'dfn' refs found for 'is scoped' with for='['CustomAttributeRegistry']'."
},
{
"lineNum": "~5783:1",
"messageType": "link",
"text": "No 'idl-name' refs found for 'CustomAttributeRegistry'."
},
{
"lineNum": "5860:69",
"messageType": "link",
"text": "No 'idl' refs found for 'CustomAttributeRegistry'."
},
{
"lineNum": "6097:19",
"messageType": "link",
"text": "No 'idl' refs found for 'CustomAttributeRegistry'."
},
{
"lineNum": "6275:4",
"messageType": "link",
"text": "No 'dfn' refs found for 'is scoped' with for='['CustomAttributeRegistry']'."
},
{
"lineNum": "6328:3",
"messageType": "link",
"text": "No 'idl' refs found for 'CustomAttributeRegistry'."
},
{
"lineNum": "6376:4",
"messageType": "link",
"text": "No 'dfn' refs found for 'is scoped' with for='['CustomAttributeRegistry']'."
},
{
"lineNum": "6492:7",
"messageType": "link",
"text": "No 'dfn' refs found for 'is scoped' with for='['CustomAttributeRegistry']'."
},
{
"lineNum": "6518:6",
"messageType": "link",
"text": "No 'dfn' refs found for 'enqueue a custom attribute callback reaction'."
},
{
"lineNum": "6523:33",
"messageType": "link",
"text": "No 'dfn' refs found for 'enqueue a custom attribute callback reaction'."
},
{
"lineNum": "6565:14",
"messageType": "link",
"text": "No 'idl' refs found for 'CustomAttributeRegistry'."
},
{
"lineNum": "6567:23",
"messageType": "link",
"text": "No 'dfn' refs found for 'is scoped' with for='['CustomAttributeRegistry']'."
},
{
"lineNum": "6569:14",
"messageType": "link",
"text": "No 'idl' refs found for 'CustomAttributeRegistry'."
},
{
"lineNum": "6616:52",
"messageType": "link",
"text": "No 'dfn' refs found for 'looking up a custom attribute definition'."
},
{
"lineNum": "6620:49",
"messageType": "link",
"text": "No 'dfn' refs found for 'construct a custom attribute'."
},
{
"lineNum": "6623:31",
"messageType": "link",
"text": "No 'dfn' refs found for 'custom attribute constructor'."
},
{
"lineNum": "6650:4",
"messageType": "link",
"text": "No 'dfn' refs found for 'looking up a custom attribute definition'."
},
{
"lineNum": "6653:54",
"messageType": "link",
"text": "No 'dfn' refs found for 'construct a custom attribute'."
},
{
"lineNum": "6658:3",
"messageType": "link",
"text": "No 'dfn' refs found for 'custom attribute constructor'."
},
{
"lineNum": "6678:2",
"messageType": "link",
"text": "No 'dfn' refs found for 'is scoped' with for='['CustomAttributeRegistry']'."
},
{
"lineNum": "7100:12",
"messageType": "link",
"text": "No 'idl' refs found for 'CustomAttributeRegistry'."
},
{
"lineNum": "~7224:1",
"messageType": "link",
"text": "No 'idl-name' refs found for 'CustomAttributeRegistry'."
},
{
"lineNum": "7309:16",
"messageType": "link",
"text": "No 'idl' refs found for 'CustomAttributeRegistry'."
},
{
"lineNum": "7405:40",
"messageType": "link",
"text": "No 'idl' refs found for 'CustomAttributeRegistry'."
},
{
"lineNum": "7675:2",
"messageType": "link",
"text": "No 'dfn' refs found for 'enqueue a custom attribute callback reaction'."
},
{
"lineNum": "7697:2",
"messageType": "link",
"text": "No 'dfn' refs found for 'enqueue a custom attribute callback reaction'."
},
{
"lineNum": "7708:11",
"messageType": "link",
"text": "No 'dfn' refs found for 'enqueue a custom attribute callback reaction'."
},
{
"lineNum": "7713:4",
"messageType": "link",
"text": "No 'dfn' refs found for 'enqueue a custom attribute callback reaction'."
},
{
"lineNum": "7718:17",
"messageType": "link",
"text": "No 'dfn' refs found for 'try to upgrade an attribute'."
},
{
"lineNum": "7721:33",
"messageType": "link",
"text": "No 'dfn' refs found for 'custom attribute definition'."
},
{
"lineNum": "7746:11",
"messageType": "link",
"text": "No 'dfn' refs found for 'enqueue a custom attribute callback reaction'."
},
{
"lineNum": "7751:4",
"messageType": "link",
"text": "No 'dfn' refs found for 'enqueue a custom attribute callback reaction'."
},
{
"lineNum": "7776:2",
"messageType": "link",
"text": "No 'dfn' refs found for 'enqueue a custom attribute callback reaction'."
},
{
"lineNum": "7790:11",
"messageType": "link",
"text": "No 'dfn' refs found for 'enqueue a custom attribute callback reaction'."
},
{
"lineNum": "7795:4",
"messageType": "link",
"text": "No 'dfn' refs found for 'enqueue a custom attribute callback reaction'."
},
{
"lineNum": "7803:11",
"messageType": "link",
"text": "No 'dfn' refs found for 'enqueue a custom attribute callback reaction'."
},
{
"lineNum": "7808:4",
"messageType": "link",
"text": "No 'dfn' refs found for 'enqueue a custom attribute callback reaction'."
},
{
"lineNum": "7812:20",
"messageType": "link",
"text": "No 'dfn' refs found for 'try to upgrade an attribute'."
},
{
"lineNum": "8403:2",
"messageType": "link",
"text": "No 'dfn' refs found for 'is scoped' with for='['CustomAttributeRegistry']'."
},
{
"lineNum": "8424:34",
"messageType": "link",
"text": "No 'idl' refs found for 'CustomAttributeRegistry'."
},
{
"lineNum": "8538:38",
"messageType": "link",
"text": "No 'idl' refs found for 'CustomAttributeRegistry'."
},
{
"lineNum": "8826:29",
"messageType": "link",
"text": "No 'dfn' refs found for 'custom attribute definition'."
},
{
"lineNum": "8834:54",
"messageType": "link",
"text": "No 'dfn' refs found for 'upgrade an attribute'."
},
{
"lineNum": "8844:2",
"messageType": "link",
"text": "No 'idl' refs found for 'CustomAttrConstructor'."
},
{
"lineNum": null,
"messageType": "failure",
"text": "Did not generate, due to errors exceeding the allowed error level."
}
]
```
_This seems to be an issue with the [Spec Generator](https://www.w3.org/publications/spec-generator/) service. PR Preview doesn't manage this service and so has no control over it. If you've identified an issue with it, you can [report the issue to the maintainers of Spec Generator](https://github.com/w3c/spec-generator/issues/new) directly. Please be courteous. Thank you!_
_If you don't have enough information above to solve the error by yourself or if the issue doesn't seem related to Spec Generator, you can [file an issue with PR Preview](https://github.com/specinfra/pr-preview/issues/new?title=Unidentified%20Error&body=See%20whatwg/dom%231517.)._
</details>
You can view, comment on, or merge this pull request online at:
https://github.com/whatwg/dom/pull/1517
-- Commit Summary --
* Custom Attributes
-- File Changes --
M dom.bs (572)
-- Patch Links --
https://github.com/whatwg/dom/pull/1517.patch
https://github.com/whatwg/dom/pull/1517.diff
--
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Received on Thursday, 29 October 2026 09:07:08 UTC