[whatwg/webidl] Allow HTML to integrate with MakeRealm (PR #1608)

This complements https://github.com/whatwg/html/pull/12580 to make https://github.com/tc39/ecma262/pull/3728 work.

In particular when we allocate a global object we cannot simultaneously expect it to be able to tell us about what is exposed on it. That needs to be known ahead of time. (With this refactoring it is stored on the environment settings object instead.)

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This should be editorial.


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### :boom: Error: 422 Unprocessable Entity :boom: ###

[PR Preview](https://github.com/tobie/pr-preview#pr-preview) failed to build. _(Last tried on Jun 15, 2026, 6:07 PM 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%2Fwhatwg%2Fwebidl%2F739aebf63d3ad1001f78b4bcd4d63ab29681e779%2Findex.bs&force=1&md-status=LS-PR&md-Text-Macro=PR-NUMBER%201608)

**Error output:**

```json
[
    {
        "lineNum": "10057:22",
        "messageType": "link",
        "text": "No 'dfn' refs found for 'global names' with for='['environment settings object']'."
    },
    {
        "lineNum": "10101:1",
        "messageType": "link",
        "text": "No 'dfn' refs found for 'global names' with for='['environment settings object']'."
    },
    {
        "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/tobie/pr-preview/issues/new?title=Unidentified%20Error&body=See%20whatwg/webidl%231608.)._

</details>

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/webidl/pull/1608

-- Commit Summary --

  * Allow HTML to integrate with MakeRealm

-- File Changes --

    M index.bs (19)

-- Patch Links --

https://github.com/whatwg/webidl/pull/1608.patch
https://github.com/whatwg/webidl/pull/1608.diff

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