Pop execution context off after InitializeHostDefinedRealm

[siusin]

See WHATWG/HTML issue #3784, to conform with the definition of InitializeHostDefinedRealm.

Thanks to @TimothyGu.

[siusin]

See also WHATWG #3836, to clean up the event handlers section.

[TimothyGu]

FYI they are fairly independent changes.

[siusin]

We're closing this issue on the W3C HTML specification because the W3C and WHATWG are now working together on HTML, and all issues are being discussed on the WHATWG repository.

If you filed this issue and you still think it is relevant, please open a new issue on the WHATWG repository and reference this issue (if there is useful information here). Before you open a new issue, please check for existing issues on the WHATWG repository to avoid duplication.

If you have questions about this, please open an issue on the W3C HTML WG repository or send an email to public-html@w3.org.