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when-playgrounds-appear

When playgrounds appear

Last reviewed May 28, 2026 Content v20260528
Track mode
none
Means
Read / quiz
Reading
~1 min
Level
beginner

This lesson

This lesson covers When playgrounds appear as part of the How To track.

Knowing how to study here is as important as knowing syntax—you will use playgrounds, MCQs, and interview mode.

Every lesson page on this curriculum: reading mode, playgrounds, MCQs, and discussion.

Apply the study pattern on the next language lesson you open—playground, MCQs, interview mode.

Immediately after the previous lesson in this track.

Not every topic runs code in the browser. The track overview and lesson header show an execution profile.

Common profiles

  • iframe_html — HTML/CSS preview in an iframe.
  • client_javascript — JS in the browser; use DevTools console too.
  • server_script / server_compiled — needs the dev runner (npm run runner locally).
  • none — read + local practice (Git, Excel, AWS console, …).

When Run is disabled

Follow the Install on your device section on the first lesson of each track and practice in your own terminal or app.

Self-check

  1. Why can’t Git commands run inside a web iframe safely?
  2. What two terminals do you need for PHP playground on localhost?

Interview prep

Why might a topic have no “Run” button?

Some tracks are conceptual or shell-oriented; running arbitrary code in the browser would be unsafe or misleading. You practice in your own environment instead.

What should you never paste into a public code sandbox?

Secrets (tokens, passwords), private URLs with session cookies, or customer data—treat sandboxes as observable.

Interview tip Lesson completion confidence

Can you explain this lesson in 30 seconds without reading notes?

Not saved yet.

Check yourself

Multiple choice — immediate feedback.

Discussion

Past discussion is visible to everyone. Only logged-in users can post comments and replies.

Starter discussion topics

  • What part of this lesson needs a second read?
  • What would you try differently in a real project?

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