This is where we write about the mental models:
This chapter answers the question:
“What is CSS doing before I touch anything?”
It gives us the physics of the system.
Once we understand the physics,
we can introduce the tools that extend normal flow:
This chapter answers:
“How do I guide the browser’s layout decisions?”
It builds directly on Foundations.
Now that we know how the browser arranges elements,
we learn how to target them:
This chapter answers:
“How do I point to the thing I want to style?”
It’s the bridge between structure and styling.
This chapter is about the HTML–CSS relationship:
This answers:
“How do I shape the document so CSS can do its job?”
It’s the architectural chapter — the one that teaches restraint.
Only now do we talk about the surface:
This chapter answers:
“How do we express the look and feel with clarity and care?”
It’s where the craft becomes visible.
This chapter is the quiet glossary:
short definitions that reinforce understanding
It answers:
“What language do we use to talk about CSS clearly?”
This is the chapter that makes the Primer evergreen.
Why This Arc Works
It mirrors how humans learn:
It also mirrors how AI should be guided:
This is why your Primer feels evergreen —
it teaches the thinking, not the trends.