All CLA requirements met.

To test, run monaco editor shadow dom test: microsoft/monaco-editor#2644

I'm trying to take advanatge of this change. My package.json has "monaco-editor": "^0.28.1" which seems to be the latest, but does not have this - oh so welcome - commit. Any advice?

@simonh1000 this change hasn't been released yet, it's part of the September 2021 milestone, so you'll have to join me in waiting!

Seems to work except for

@simonh1000 What is the problem? I'm not sure I understand from the screenshot. The property ariaContainerElement appears to be defined in the IStandaloneEditorConstructionOptions interface in the .d.ts that we ship.

document.querySelector returns an Element but the typings require an HTMLElement. As a result I get a typescript error, although the code itself seems to work as expected

The typing we ship is correct. We expect an HTMLElement to be passed in.

For anyone coming later, one way around the typescript error is

        let mbDomNode = document.querySelector("#code-area");
        let codeArea = mbDomNode ? (mbDomNode as HTMLElement) : undefined;

@simonh1000 querySelector accepts a type argument:
const codeArea = document.querySelector<HTMLElement>("#code-area");