Inconsistent use of language names - JS / JavaScript / JAVASCRIPT

Summary

Note: This issue is from https://github.com/orgs/mdn/discussions/426.

Live samples show abbreviated language names like JS and MD in live samples' headers, e.g. setTimeout(). However, showing the full names makes it more friendly to beginners and enables the removal proposed in https://github.com/orgs/mdn/discussions/426.

URL

https://developer.mozilla.org/en-US/docs/Web/API/setTimeout#syntax

Reproduction steps

1. Navigate to the linked page above.
2. Look at the header in the live sample.

Expected behavior

Seeing "JavaScript".

Actual behavior

Seeing "JS".

Device

Desktop

Browser

Firefox

Browser version

Stable

Operating system

Windows

Screenshot

No response

Anything else?

The normative advisement in CSS Text implies that it's incorrect to use text-transform for these headers. This already shows symptoms in this MDN page with WebIDL codes.

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.

Start at the linked setTimeout() page and inspect how the live sample header labels its language. Trace that label to the frontend source, then check other live samples for the same naming behavior. Done means the header displays “JavaScript” rather than “JS” without relying on text transformation.