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Add a component from the palette or text editor → connect the traffic source to it → run the load test. Undo reverses an edit; Hint helps you choose a design.
Scroll to pan at readable size. Text controls work at every size.
Portrait works here. Landscape offers more room for the diagram.
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Challenge
The challenge pauses while you read the glossary or open chapters.
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Transcript
Request
Success / response
Failure
Cached / queued
Focus the lesson for shortcuts · Space play · ←/→ seek · [ ] chapters · C captions · S transcript · P challenge · / search · G glossary