Keep a searchable navigation tree persistent while readers move among reference entries.
Design notes
Surface
Documentation browser
Navigation
The language index stays visible while the right pane carries the selected documentation.
Layout
A narrow search-and-index sidebar sits next to a broad document with grouped linked entries.
Density
Primary content has the most space; repeated rows and secondary navigation use a compact, consistent rhythm.
Color
Plain white surfaces, small blue selection highlights, and simple dark headings.
Type
Use compact index rows and a wider reading column with clear heading levels.
Pattern
Keep a searchable navigation tree persistent while readers move among reference entries.
States
Public JavaScript reference page after declining optional tracking cookies.
Don't
Adapt the interaction pattern to your own product. Do not copy brand assets, sample identities, proprietary text, or assume unseen states. Specify keyboard behavior, loading, empty, error, and narrow-screen layouts for your implementation.
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