---
title: "How this site is built"
description: "How the Pathfinder Sustainability site is built from one content source into a human view and a machine view, and the checks that run on every build."
url: https://pathfindersustainability.com/docs/trust/how-this-site-is-built
tier: public
type: explanation
status: live
launch_state: pre_launch
last_reviewed: 2026-11-14
index: https://pathfindersustainability.com/llms.txt
---

# How this site is built

One source of content, two views, and the checks that keep them the same.

## At a glance

- One content source produces every page twice, as a designed page and as Markdown.
- A test fails the build if the two differ by a single sentence.
- Every claim traces to a reviewed record of facts.
- No cookies, no analytics and no requests to other sites.

## The answer

Each page is written once, as structured content. One build turns it into the designed page people read and the Markdown twin agents read. A parity test then compares the two, sentence by sentence, and fails the build on any difference. That is why the machine view can be trusted to say what the human view says.

## Two views of one page

The switch at the top of every page moves between them. The human view is the designed page. The machine view shows the same page as its Markdown. The raw twin sits at the page address plus `.md`.

## Facts

Every factual sentence rests on an entry in a reviewed record of facts. Sentences that rest on an entry not yet cleared for publication are held back, and the build checks that none of them reach the site. The published facts are in the [facts file](https://pathfindersustainability.com/facts.json).

## Checks on every build

- Content parity between every page and its twin.
- A deny-list of names and claims that must never appear.
- No placeholder text in the published site.
- Accessibility, in both colour schemes.
- A size budget for every page.

## Illustrations

Every illustration is drawn in code on this site. None is a stock image or a generated picture. Each one has a designed still state and a written description. They are metaphors, not data.

> Illustration: A map sheet and its field book side by side. Lines on the map are tied by thin leader lines to entries in the book. A metaphor for every claim on a page tracing back to a recorded fact.

## What this does not cover

This page describes the site, not the platform. The platform is documented in the [overview](https://pathfindersustainability.com/docs/overview/what-is-pathfinder.md).

Last reviewed 2026-11-14.