Allow HTML to integrate with MakeRealm

[annevk]

This complements whatwg/html#12580 to make tc39/ecma262#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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💥 Error: 422 Unprocessable Entity 💥

PR Preview failed to build. (Last tried on Jun 15, 2026, 6:07 PM UTC).

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PR Preview relies on a number of web services to run. There seems to be an issue with the following one:

🚨 Spec Generator - Spec Generator is the web service used to build bikeshed/ReSpec specs

🔗 Related URL

Error output:

[
    {
        "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."
    }
]

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