Remove unneeded learning-area refs from js materials

[chrisdavidmills]

Description

This PR is part of a recent project to clean up the Learn-related repos by removing all files from learning-area that are no longer referenced here, hopefully saving us a lot of maintenance work in the future.

This PR focuses just on the learn JS material directory. I've:

• Removed all references to learning-area that are no longer needed here.
• Created some new live samples, thereby further increasing the number of learning-area files and references that can be removed.
• Done a few other bits of assorted cleanup.

The accompanying learning-area PR is at mdn/learning-area#850. These two PRs need to be merged simultaneously to avoid breakage.

Motivation

Additional details

Related issues and pull requests

[github-actions]

Preview URLs (12 pages)

• /en-US/docs/Learn_web_development/Core/Scripting/Build_your_own_function
• /en-US/docs/Learn_web_development/Core/Scripting/Conditionals
• /en-US/docs/Learn_web_development/Core/Scripting/Event_bubbling
• /en-US/docs/Learn_web_development/Core/Scripting/Events
• /en-US/docs/Learn_web_development/Core/Scripting/Functions
• /en-US/docs/Learn_web_development/Core/Scripting/Loops
• /en-US/docs/Learn_web_development/Core/Scripting/Object_basics
• /en-US/docs/Learn_web_development/Core/Scripting/Return_values
• /en-US/docs/Learn_web_development/Core/Scripting/What_is_JavaScript
• /en-US/docs/Learn_web_development/Extensions/Client-side_APIs/Drawing_graphics
• /en-US/docs/Learn_web_development/Extensions/Testing/Testing_strategies
• /en-US/docs/Learn_web_development/Extensions/Testing/Your_own_automation_environment

Flaws (1)

Note! 11 documents with no flaws that don't need to be listed. 🎉

Found an unexpected or unresolvable flaw? Please report it here.

URL: /en-US/docs/Learn_web_development/Core/Scripting/Object_basics
Title: JavaScript object basics
Flaw count: 1

• macros:
  • Macro jsxref produces link /en-US/docs/Web/JavaScript/Reference/new which is a redirect

External URLs (4)

URL: /en-US/docs/Learn_web_development/Core/Scripting/Event_bubbling
Title: Event bubbling

• https://domevents.dev/ (1 time)
• https://www.quirksmode.org/js/events_order.html (1 time)

---

URL: /en-US/docs/Learn_web_development/Core/Scripting/Events
Title: Introduction to events

• https://mdn.github.io/learning-area/javascript/building-blocks/preventdefault/ (1 time) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Learn_web_development/Extensions/Client-side_APIs/Drawing_graphics
Title: Drawing graphics

• https://mdn.github.io/learning-area/javascript/apis/threejs-video-cube/ (1 time) (Note! This may be a new URL 👀)

(comment last updated: 2026-08-11 10:50:59)