Custom Elements V3 - Shadow DOM bind:this returns undefined

[DOCS-kdu3]

As the title says, the bind:this returns undefined for Custom Elements, and I believe it's due to the Shadow DOM. Below is the demonstrative REPL.

https://v3.svelte.technology/repl?version=3.0.0-beta.21&gist=37a2d6fd64e2e167ed61f60c78293d6a

[DOCS-kdu3]

Nevermind. My confusion came from querySelectors in the shadow dom in my pet project, and not initially using the onMount hook in my REPL.

The REPL has been updated to work properly.