Add a JS script to prune html example files

test/pruneHtml.js

@@ -0,0 +1,30 @@
+#! /usr/bin/env node
+
+// This can be called with e.g. `test/pruneHtml.js path/to/the/file.html`
+// The same file can then be prettified using `npx prettier --parser html --print-width 250 -w path/to/the/file.html`
+
+const fs = require("fs");
+const url = require("url");
+const jsdom = require("jsdom");
+const {JSDOM} = jsdom;
+
+const [_1, _2, filePath] = process.argv;
+const content = fs.readFileSync(filePath);
+const dom = new JSDOM(content);
+
+function removeTrackers(link) {
+    const u = new URL(link);
+    u.searchParams.delete("courseClaim");
+    u.searchParams.delete("eBP");
+    u.searchParams.delete("refId");
+    u.searchParams.delete("trackingId");
+    u.searchParams.delete("destRedirectURL");
+    return url.format(u);
+}
+
+dom.window.document.querySelectorAll("code").forEach(el => el.remove());
+dom.window.document.querySelectorAll("meta").forEach(el => el.remove());
+dom.window.document.querySelectorAll("script").forEach(el => el.remove());
+dom.window.document.querySelectorAll("a").forEach(el => el.href = removeTrackers(el.href));
+
+fs.writeFileSync(filePath, dom.window.document.documentElement.innerHTML);