diff --git a/asan.js b/asan.js
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+/*
+Copyright (c) 2023 Charles Iliya Krempeaux :: http://changelog.ca/
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+
+// The page that this script is loaded into is called the 'destination'.
+// Which is shortened to "dst" in the code.
+//
+// Elsewhere, at a different path, there is a 'source'.
+// Which is shortern to "src" in the code.
+//
+// The 'dst' has a path. For example, it might be:
+//
+//	/topic/apple/banana/cherry
+//
+// The page of the 'src' is based on the path of the 'dst'.
+// For the example 'dst' path the corresponding 'src' path is:
+//
+//	/src/topic/apple/banana/cherry
+//
+// I.e., the corresponding 'src' path has a "/src" prefix.
+//
+// This JavaScript code looks at the path of the 'dst' and calculates the path of the 'src'.
+// It then fetches the HTML from the 'src' path.
+// It then includes the HTML it fetched from the 'src' path here into the 'dst'.
+// It then sets the title of the page to the inner-text for the first <h1> from the 'src'.
+export function include(element) {
+	console.log("[asan][include] begin")
+
+	if (undefined === element) {
+		console.log("[asan][include] element is undefined")
+		console.log("[asan][include] end")
+		return
+	}
+
+	let dst = window.location.pathname
+	let src = "/src" + dst
+
+	console.log("[asan][include] dst-path: ", dst)
+	console.log("[asan][include] src-path: ", src)
+
+	fetch(src).
+	then( response => {
+		if (!response.ok) {
+			element.innerHTML = '<article><h1>Not Found</h1></article>'
+			throw new Error('network response was not ok')
+		}
+
+		console.log("[asan][include] src found")
+		return response.text()
+	}).
+	then( text => {
+		element.innerHTML = text
+
+		return text
+	}).
+	then( () => {
+
+		// Set the title of the page to the value of the first <h1> (if there is an <h1>).
+
+		const h1s = element.getElementsByTagName("h1")
+		if (undefined === h1s || element.length <= 0) {
+			return
+		}
+		const h1 = h1s[0]
+
+		const titles = document.getElementsByTagName("title")
+		if (undefined === titles || titles.length <= 0) {
+			return
+		}
+		const title = titles[0]
+
+		const titleText = h1.innerText
+		console.log("[dst] title-text: ", titleText)
+		title.innerText = titleText
+
+	});
+
+	console.log("[asan][include] end")
+}