Copy this file when a new lesson needs the shared foundation. It is not a published course.
Scroll reveal, a back-to-top control, lesson progress, a knowledge check, and a small diagram. Nothing here replaces an old lesson.
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| Step | What the student sees |
|---|---|
| 1 | The family stylesheet paints the course color. |
| 2 | dfd-system.css loads last and only adds shared guards. |
select course_id, last_lesson_id
from user_progress
where course_id = 'example';Which key identifies one row in a table?