DOMContentLoaded event is not fired

[Namchee]

Summary

DOMContentLoaded event isn't fired by the playground code. This makes every code that depends on DOMContentLoaded breaks as they won't be executed.

URL

https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Roles/tab_role

Reproduction steps

1. Visit the page
2. Open the code in playground by clicking the Play link
3. Issue reproduced

Expected behavior

The tabs should be navigatable with Tab and arrow keys.

Actual behavior

Tab example doesn't work since DOMContentLoaded event is not fired at all.

Device

Desktop

Browser

Chrome

Browser version

Stable

Operating system

Linux

Screenshot

No response

Anything else?

This issue came from mdn/content#29889

Can be hacked by listening to readyState instead. Sample PR.

Validations

• I have read the Community Participation Guidelines.
• I have verified that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• I have checked that this is a concrete bug. For Q&A open a GitHub Discussion.

[wbamberg]

@caugner, this does not seem to be fixed by #10770 .

[caugner]

@wbamberg Works for me. Please open a new issue for the problem you're experiencing..