diff --git a/data/README.md b/data/README.md
index 0745650..f9e865a 100644
--- a/data/README.md
+++ b/data/README.md
@@ -85,7 +85,7 @@ Travel information: Transit schedules, geography, fares.
 | `full_name` | Free text. |
 | `homepage_url` | URL. |
 | `status` | The coalition's overall finding: `compliant`, `partially_compliant`, `not_compliant`, `inactive` or `under_review`. |
-| `modes` | Any of `public_transport`, `microtransit_drt`, `taxi_ridehail`, `bicycle`, `pedestrian_accessibility`, `parking`. Empty shows as "Unclassified". |
+| `modes` | Any of `public_transport`, `microtransit_drt`, `taxi_ridehail`, `bicycle`, `bikeshare`, `shared_scooter`, `carsharing`, `pedestrian_accessibility`, `parking`. Empty shows as "Unclassified". |
 | `maintainers` | Organization ids: file names in `organizations/`. |
 | `licences` | A list of licences, each with an `id` from `licences.csv` and optional `scopes`: `specification`, `documentation`, `code`, `data`. Empty means no licence is stated. |
 | `licence_evidence_url` | URL of the licence text, when it is not the licence's own page. |
diff --git a/hooks/specifications.py b/hooks/specifications.py
index b0d5794..fdfd75d 100644
--- a/hooks/specifications.py
+++ b/hooks/specifications.py
@@ -38,6 +38,7 @@
 
 import spec_api  # noqa: E402  (path set above)
 import spec_data  # noqa: E402
+import spec_history  # noqa: E402
 
 SECTION = "specifications"
 
@@ -642,6 +643,7 @@ def render_detail(spec, data, base):
         sections.append(("adoption", "Adoption", "account-group"))
     if spec["maintainers"]:
         sections.append(("maintainers", "Maintainers", "domain"))
+    sections.append(("history", "History", "history"))
     o.append('<nav class="spec-nav" aria-label="On this page"><ul>')
     for sid, label, ico in sections:
         o.append('<li><a href="#%s">%s<span>%s</span></a></li>' % (sid, icon(ico), escape(label)))
@@ -776,7 +778,12 @@ def render_detail(spec, data, base):
         if spec["adopters_registry"]:
             o.append(dl_row("database-outline", "Adopters registry",
                             ext_link(spec["adopters_registry"], "Open registry")))
-        o.append("</dl></section>")
+        o.append("</dl>")
+        series = spec_history.adopters_series(spec)
+        if len(series) >= 2:
+            o.append('<div class="adopt-hist"><h3>%s<span>History</span></h3>%s</div>'
+                     % (icon("chart-line"), render_adopters_chart(series)))
+        o.append("</section>")
 
     # ---- maintainers
     if spec["maintainers"]:
@@ -809,6 +816,8 @@ def render_detail(spec, data, base):
             o.append("</ul></div>")
         o.append("</section>")
 
+    o.append(render_history(spec, data))
+
     o.append("</div>")  # body
 
     o.append(render_contribute(data, spec))
@@ -817,6 +826,152 @@ def render_detail(spec, data, base):
     return "\n".join(o)
 
 
+def nice_ceiling(value):
+    """A round number a little above `value`, for the top of a chart axis."""
+    import math
+    if value <= 0:
+        return 1
+    target = value * 1.1
+    mag = 10 ** math.floor(math.log10(target))
+    for step in (1, 1.2, 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10):
+        if step * mag >= target:
+            return int(step * mag) if step * mag >= 1 else step * mag
+    return 10 * mag
+
+
+def short_date(iso):
+    import datetime
+    d = datetime.date.fromisoformat(iso)
+    return "%d %s %d" % (d.day, d.strftime("%b"), d.year)
+
+
+def render_adopters_chart(points):
+    """Known adopters over time: one line, time across, count up from zero.
+
+    Deliberately bare: no legend (there is one series and the heading names
+    it), two dates and three values on the axes, and a direct label on the
+    latest count only. Every point carries its exact value and date on hover
+    or focus, and the same numbers are in a table for screen readers.
+
+    The line is drawn in a stretched 100x100 SVG and the dots and labels are
+    HTML placed in percentages on top of it, so the plot fills any width
+    without distorting the dots or the text.
+    """
+    import datetime
+    days = [datetime.date.fromisoformat(p["date"]).toordinal() for p in points]
+    span = max(days[-1] - days[0], 1)
+    top = nice_ceiling(max(p["count"] for p in points))
+    xy = [((d - days[0]) * 100.0 / span, 100 - p["count"] * 100.0 / top)
+          for d, p in zip(days, points)]
+    line = " ".join("%.2f,%.2f" % c for c in xy)
+
+    o = ['<figure class="adopt-chart">']
+    o.append('<div class="adopt-chart__plot">')
+    for value, pos in ((top, 0), (top / 2.0, 50), (0, 100)):
+        o.append('<span class="adopt-chart__y" style="top:%d%%" aria-hidden="true">%s</span>'
+                 % (pos, "{:,}".format(int(value)) if value == int(value) else value))
+    o.append('<svg viewBox="0 0 100 100" preserveAspectRatio="none" aria-hidden="true" '
+             'focusable="false">')
+    for y in (0, 50):
+        o.append('<line class="adopt-chart__grid" x1="0" x2="100" y1="%d" y2="%d" '
+                 'vector-effect="non-scaling-stroke"/>' % (y, y))
+    o.append('<line class="adopt-chart__base" x1="0" x2="100" y1="100" y2="100" '
+             'vector-effect="non-scaling-stroke"/>')
+    o.append('<polygon class="adopt-chart__area" points="0,100 %s 100,100"/>' % line)
+    o.append('<polyline class="adopt-chart__line" points="%s" '
+             'vector-effect="non-scaling-stroke"/>' % line)
+    o.append("</svg>")
+    for n, ((x, y), p) in enumerate(zip(xy, points)):
+        last = n == len(points) - 1
+        tip = "%s adopters, %s" % ("{:,}".format(p["count"]), short_date(p["date"]))
+        o.append('<span class="adopt-chart__dot%s" style="left:%.2f%%;top:%.2f%%" tabindex="0" '
+                 'aria-label="%s"><span class="adopt-chart__tip" aria-hidden="true">%s</span>'
+                 "</span>" % (" is-last" if last else "", x, y, escape(tip), escape(tip)))
+    o.append('<span class="adopt-chart__val" style="left:%.2f%%;top:%.2f%%" aria-hidden="true">'
+             "%s</span>" % (xy[-1][0], xy[-1][1], "{:,}".format(points[-1]["count"])))
+    o.append("</div>")
+    o.append('<div class="adopt-chart__x" aria-hidden="true"><span>%s</span><span>%s</span></div>'
+             % (short_date(points[0]["date"]), short_date(points[-1]["date"])))
+    o.append('<table class="u-sr"><caption>Known adopters over time</caption><thead><tr>'
+             '<th scope="col">Date</th><th scope="col">Known adopters</th></tr></thead><tbody>')
+    for p in points:
+        o.append("<tr><td>%s</td><td>%s</td></tr>"
+                 % (escape(p["date"]), "{:,}".format(p["count"])))
+    o.append("</tbody></table></figure>")
+    return "".join(o)
+
+
+def history_labels(data):
+    """Field names and value labels the History script needs, in one object.
+
+    The script compares two versions of the file as written, so it sees keys
+    joined with dots ("adoption.adopters_count") and ids
+    ("partially_compliant", "mobilitydata"). These are the words the rest of
+    the page uses for the same things.
+    """
+    fields = {
+        "short_name": "Short name",
+        "full_name": "Full name",
+        "homepage_url": "Homepage",
+        "status": "MDIP status",
+        "modes": "Mode",
+        "maintainers": "Maintainers",
+        "licences": "Licence",
+        "licence_evidence_url": "Licence text",
+        "first_release_year": "First release",
+        "adoption.lifecycle": "Lifecycle",
+        "adoption.tier": "Adoption tier",
+        "adoption.adopters_count": "Known adopters",
+        "adoption.adopters_count_updated": "Adopters counted on",
+        "adoption.adopters_registry_url": "Adopters registry",
+        "adoption.confirmed_by_maintainer": "Confirmed by maintainer",
+        "description": "Description",
+    }
+    for c in data["criteria"]:
+        base = "principles.%s." % c["key"]
+        fields[base + "verdict"] = c["label"]
+        fields[base + "rationale"] = "%s: rationale" % c["label"]
+        fields[base + "evidence_url"] = "%s: evidence" % c["label"]
+    values = {
+        "status": dict((k, v["label"]) for k, v in spec_data.STATUS.items()),
+        "verdict": dict((k, v["label"]) for k, v in spec_data.VERDICT.items()),
+        "adoption.lifecycle": dict((k, v["label"]) for k, v in spec_data.LIFECYCLE.items()),
+        "adoption.tier": dict((k, v["label"]) for k, v in spec_data.ADOPTION_TIER.items()),
+        "modes": dict(spec_data.MODES),
+        "maintainers": dict((k, o["name"]) for k, o in data["organizations"].items()),
+    }
+    icons = dict((name, icon(name)) for name in (
+        "source-pull", "source-merge", "source-commit", "plus-circle-outline",
+        "delete-outline", "open-in-new"))
+    return {"fields": fields, "values": values, "icons": icons}
+
+
+def render_history(spec, data):
+    """Recent changes to this entry on GitHub, filled in by the page script.
+
+    The list is read from GitHub's API in the visitor's browser rather than at
+    build time, so a pull request shows up here as soon as it is opened, not
+    at the next deploy. Only the frame is rendered here: the heading, a link
+    to the file's full history (which is all a reader gets without JavaScript
+    or when GitHub cannot be reached), and the labels the script needs.
+    """
+    path = spec["source_path"]
+    commits = "https://github.com/%s/commits/%s/%s" % (
+        spec_data.GITHUB_REPO, spec_data.GITHUB_BRANCH, path)
+    o = ['<section class="spec-section hist" id="history" data-history data-repo="%s" '
+         'data-branch="%s" data-path="%s">'
+         % (escape(spec_data.GITHUB_REPO), escape(spec_data.GITHUB_BRANCH), escape(path))]
+    o.append('<h2 class="spec-h2">%s<span>History</span></h2>' % icon("history"))
+    o.append('<div class="hist__body" data-history-body aria-live="polite">'
+             '<p class="hist__note">Changes to this entry are reviewed on GitHub. '
+             '<a href="%s" rel="noopener">See its full history</a>.</p></div>' % escape(commits))
+    o.append('<p class="hist__foot">%s</p>' % ext_link(commits, "Full history on GitHub"))
+    o.append('<script type="application/json" data-history-labels>%s</script>'
+             % json.dumps(history_labels(data), separators=(",", ":")).replace("</", "<\\/"))
+    o.append("</section>")
+    return "".join(o)
+
+
 SCOPE_LABEL = spec_data.LICENCE_SCOPES
 
 
diff --git a/overrides/assets/javascript/specifications.js b/overrides/assets/javascript/specifications.js
index 68955d0..2a3adb4 100644
--- a/overrides/assets/javascript/specifications.js
+++ b/overrides/assets/javascript/specifications.js
@@ -23,6 +23,10 @@
   var SEP = "::";
   var DEFAULT_SORT = "default";
 
+  /* Where this file is served from, to find vendor/ next to it. Only known
+     while the script first runs. */
+  var SCRIPT_SRC = document.currentScript ? document.currentScript.src : "";
+
   function ready(fn) {
     if (document.readyState !== "loading") { fn(); }
     else { document.addEventListener("DOMContentLoaded", fn); }
@@ -35,6 +39,7 @@
     initStickyOffset();
     initList();
     initDetail();
+    initHistory();
     initDisclosureAnchors();
   });
 
@@ -451,4 +456,425 @@
 
     sections.forEach(function (s) { observer.observe(s); });
   }
+
+  /* -------------------------------------------------------------- history */
+
+  /*
+   * The History section of a specification page, read from GitHub's public
+   * API in the browser so that an open pull request shows up as soon as it
+   * exists, without waiting for the site to be rebuilt.
+   *
+   * Two lists: pull requests still open on this entry's file ("Review in
+   * progress"), then the last MAX_CHANGES changes merged into the branch the
+   * site is built from. What a change did is worked out by reading the file
+   * before and after it (raw.githubusercontent.com, which has no rate limit)
+   * and comparing the two field by field.
+   *
+   * Without a token GitHub allows 60 API calls an hour per visitor, so every
+   * answer is kept in sessionStorage for a few minutes and shared between
+   * specification pages, and the per-commit lookups stop as soon as enough
+   * changes are found. If GitHub cannot be reached, the server-rendered link
+   * to the file's history stays as it is.
+   */
+  var MAX_CHANGES = 4;
+  var MAX_ROWS = 6;
+  var EXCERPT = 180;
+  var CACHE_MS = 10 * 60 * 1000;
+
+  function initHistory() {
+    var root = document.querySelector("[data-history]");
+    var labelsEl = root && root.querySelector("[data-history-labels]");
+    if (!root || !labelsEl || !window.fetch || !window.Promise) { return; }
+
+    var cfg = JSON.parse(labelsEl.textContent);
+    var repo = root.getAttribute("data-repo");
+    var branch = root.getAttribute("data-branch");
+    var path = root.getAttribute("data-path");
+    var body = root.querySelector("[data-history-body]");
+    var api = "https://api.github.com/repos/" + repo;
+    var fallback = body.innerHTML;
+
+    body.innerHTML = '<p class="hist__note">Loading changes from GitHub...</p>';
+
+    Promise.all([loadYaml(), openProposals(api, path), mergedChanges(api, repo, branch, path)])
+      .then(function (res) {
+        var open = res[1];
+        var merged = res[2];
+        return Promise.all([
+          Promise.all(open.map(function (pr) {
+            return diffOf(
+              raw(repo, pr.base, path),
+              raw(pr.headRepo || repo, pr.head, path)
+            ).then(function (d) { pr.diff = d; return pr; });
+          })),
+          Promise.all(merged.map(function (ch) {
+            return diffOf(
+              ch.parent ? raw(repo, ch.parent, path) : Promise.resolve(null),
+              raw(repo, ch.sha, path)
+            ).then(function (d) { ch.diff = d; return ch; });
+          }))
+        ]);
+      })
+      .then(function (lists) {
+        body.innerHTML = render(lists[0], lists[1]);
+      })
+      .catch(function () {
+        body.innerHTML = '<p class="hist__note">Recent changes could not be loaded from GitHub ' +
+          "right now.</p>" + fallback;
+      });
+
+    /* ---- rendering */
+
+    function render(open, merged) {
+      if (!open.length && !merged.length) {
+        return '<p class="hist__note">No change recorded on GitHub yet.</p>';
+      }
+      var h = "";
+      if (open.length) {
+        h += '<h3 class="hist__group">Proposed changes</h3><ol class="hist__list">' +
+          open.map(function (pr) {
+            return item({
+              tone: "info", ico: "source-pull", status: "Review in progress",
+              title: pr.title, number: pr.number, url: pr.url, date: pr.created,
+              people: [["Change proposed by", pr.user]],
+              text: pr.body, diff: pr.diff, after: "Proposed", folded: false
+            });
+          }).join("") + "</ol>";
+      }
+      if (merged.length) {
+        h += '<h3 class="hist__group">Recent changes</h3><ol class="hist__list">' +
+          merged.map(function (ch) {
+            var added = ch.diff && ch.diff.added;
+            return item({
+              tone: added ? "muted" : ch.pr ? "pass" : "muted",
+              ico: added ? "plus-circle-outline" : ch.pr ? "source-merge" : "source-commit",
+              status: added ? "Added to the registry" : ch.pr ? "Merged" : "Committed",
+              title: ch.title, number: ch.pr, url: ch.url, date: ch.date,
+              people: ch.pr
+                ? [["Change proposed by", ch.user], ["Change merged by", ch.mergedBy]]
+                : [["Changed by", ch.user]],
+              text: ch.body, diff: added ? null : ch.diff, after: "After", folded: true
+            });
+          }).join("") + "</ol>";
+      }
+      return h;
+    }
+
+    function item(it) {
+      var h = '<li class="hist__item">';
+      h += '<div class="hist__top"><span class="pill pill--' + it.tone + '">' +
+        cfg.icons[it.ico] + "<span>" + esc(it.status) + "</span></span>";
+      if (it.date) {
+        h += '<time class="hist__date" datetime="' + esc(it.date) + '">' +
+          esc(dateLabel(it.date)) + "</time>";
+      }
+      h += "</div>";
+      h += '<a class="hist__title" href="' + esc(it.url) + '" rel="noopener">' +
+        "<span>" + esc(it.title) + "</span>" +
+        (it.number ? '<span class="hist__num">#' + it.number + "</span>" : "") + "</a>";
+      var people = it.people.filter(function (p) { return p[1]; });
+      if (people.length) {
+        h += '<p class="hist__by">' + people.map(function (p) {
+          return "<span>" + esc(p[0]) + ' <a href="' + esc(p[1].url) + '" rel="noopener">@' +
+            esc(p[1].login) + "</a></span>";
+        }).join("") + "</p>";
+      }
+      var text = excerpt(it.text);
+      if (text) { h += '<p class="hist__desc">' + esc(text) + "</p>"; }
+      if (it.diff && it.diff.removed) {
+        h += '<p class="hist__note">' + cfg.icons["delete-outline"] +
+          " Removes this entry from the registry.</p>";
+      } else if (it.diff && it.diff.rows.length) {
+        var table = diffTable(it.diff.rows, it.after, it.url);
+        h += it.folded
+          ? '<details class="hist__more"><summary>What changed<span class="hist__n">' +
+            it.diff.rows.length + (it.diff.rows.length === 1 ? " field" : " fields") +
+            "</span></summary>" + table + "</details>"
+          : table;
+      }
+      return h + "</li>";
+    }
+
+    function diffTable(rows, after, url) {
+      var shown = rows.slice(0, MAX_ROWS);
+      var h = '<div class="hist__scroll"><table class="hist__t"><thead><tr>' +
+        '<th scope="col">Field</th><th scope="col">Before</th><th scope="col">' +
+        esc(after) + "</th></tr></thead><tbody>";
+      shown.forEach(function (r) {
+        h += '<tr><th scope="row">' + esc(r.label) + "</th>" + cell(r.before, "old") +
+          cell(r.after, "new") + "</tr>";
+      });
+      h += "</tbody></table></div>";
+      if (rows.length > shown.length) {
+        h += '<p class="hist__extra"><a href="' + esc(url) + '" rel="noopener">and ' +
+          (rows.length - shown.length) + " more on GitHub</a></p>";
+      }
+      return h;
+    }
+
+    function cell(value, kind) {
+      if (value === "") { return '<td class="hist__' + kind + ' is-empty">Not set</td>'; }
+      var short = value.length > 90 ? value.slice(0, 88).replace(/\s+\S*$/, "") + "..." : value;
+      return '<td class="hist__' + kind + '"' +
+        (short !== value ? ' title="' + esc(value) + '"' : "") + ">" + esc(short) + "</td>";
+    }
+
+    /* ---- comparing two versions of the file */
+
+    function diffOf(beforeP, afterP) {
+      return Promise.all([beforeP, afterP]).then(function (texts) {
+        if (texts[0] === null && texts[1] === null) { return null; }
+        if (texts[0] === null) { return { added: true, rows: [] }; }
+        if (texts[1] === null) { return { removed: true, rows: [] }; }
+        var a = flatten(texts[0]);
+        var b = flatten(texts[1]);
+        if (!a || !b) { return null; }
+        var keys = Object.keys(cfg.fields).filter(function (k) { return k in a || k in b; });
+        Object.keys(a).concat(Object.keys(b)).forEach(function (k) {
+          if (keys.indexOf(k) < 0) { keys.push(k); }
+        });
+        var rows = [];
+        keys.forEach(function (k) {
+          var x = show(k, a[k]);
+          var y = show(k, b[k]);
+          if (x !== y) { rows.push({ label: cfg.fields[k] || k, before: x, after: y }); }
+        });
+        return { rows: rows };
+      });
+    }
+
+    /* The file's fields as { "dotted.path": value }, plus its description. */
+    function flatten(text) {
+      text = text.replace(/\r\n/g, "\n");
+      var m = /^---\n([\s\S]*?)\n---\n?([\s\S]*)$/.exec(text);
+      if (!m) { return null; }
+      var front;
+      try { front = window.jsyaml.load(m[1], { schema: window.jsyaml.CORE_SCHEMA }) || {}; }
+      catch (e) { return null; }
+      var out = {};
+      Object.keys(front).forEach(function (k) {
+        var v = front[k];
+        if (k === "adoption" && isObj(v)) {
+          Object.keys(v).forEach(function (j) { out[k + "." + j] = v[j]; });
+        } else if (k === "principles" && isObj(v)) {
+          Object.keys(v).forEach(function (p) {
+            if (!isObj(v[p])) { return; }
+            Object.keys(v[p]).forEach(function (j) {
+              out["principles." + p + "." + j] = v[p][j];
+            });
+          });
+        } else if (k === "licences" && Array.isArray(v)) {
+          out[k] = v.map(function (l) {
+            if (!isObj(l)) { return String(l); }
+            var scopes = [].concat(l.scopes || []);
+            return l.id + (scopes.length ? " (" + scopes.join(", ") + ")" : "");
+          });
+        } else {
+          out[k] = v;
+        }
+      });
+      var d = /^#\s+Description\s*$([\s\S]*?)(?=^#\s|$(?![\s\S]))/m.exec(m[2]);
+      out.description = d ? d[1].trim() : "";
+      return out;
+    }
+
+    /* One value as the page words it: vocabulary labels, Yes/No, numbers. */
+    function show(key, v) {
+      if (v === undefined || v === null || v === "") { return ""; }
+      var vocab = cfg.values[/^principles\..+\.verdict$/.test(key) ? "verdict" : key];
+      var one = function (x) {
+        if (x === true) { return "Yes"; }
+        if (x === false) { return "No"; }
+        if (typeof x === "number" && key !== "first_release_year") {
+          return x.toLocaleString("en-US");
+        }
+        if (isObj(x)) { return JSON.stringify(x); }
+        return vocab && vocab[x] ? vocab[x] : String(x);
+      };
+      return Array.isArray(v) ? v.map(one).join(", ") : one(v);
+    }
+  }
+
+  /* ---- what GitHub knows */
+
+  function openProposals(api, path) {
+    return getJSON(api + "/pulls?state=open&per_page=100", function (list) {
+      return list.map(function (p) {
+        return {
+          number: p.number, title: p.title, url: p.html_url, body: p.body || "",
+          created: p.created_at, user: person(p.user), base: p.base.sha, head: p.head.sha,
+          headRepo: p.head.repo ? p.head.repo.full_name : null
+        };
+      });
+    }).then(function (prs) {
+      return Promise.all(prs.slice(0, 40).map(function (pr) {
+        return getJSON(api + "/pulls/" + pr.number + "/files?per_page=100", function (files) {
+          return files.map(function (f) { return [f.filename, f.previous_filename || ""]; });
+        }, pr.head).then(function (files) {
+          var touches = files.some(function (f) { return f[0] === path || f[1] === path; });
+          return touches ? pr : null;
+        });
+      }));
+    }).then(function (prs) { return prs.filter(Boolean); });
+  }
+
+  /*
+   * The latest changes on the branch, one per pull request. A squash merge
+   * names its pull request in the message ("Title (#12)"), as does a merge
+   * commit; any other commit is looked up once to find whether it came in
+   * through a pull request at all. Commits of the same pull request are
+   * grouped, and the file before the oldest of them is the "before" side.
+   */
+  function mergedChanges(api, repo, branch, path) {
+    var url = api + "/commits?sha=" + encodeURIComponent(branch) + "&path=" +
+      encodeURIComponent(path) + "&per_page=30";
+    return getJSON(url, function (list) {
+      return list.map(function (c) {
+        return {
+          sha: c.sha, url: c.html_url, date: c.commit.committer.date,
+          message: c.commit.message, user: person(c.author),
+          parent: c.parents.length ? c.parents[0].sha : null
+        };
+      });
+    }).then(function (commits) {
+      var changes = [];
+      var byPr = {};
+      var lookups = 0;
+
+      function step(i) {
+        if (i >= commits.length) { return Promise.resolve(); }
+        var c = commits[i];
+        var first = c.message.split("\n")[0];
+        var m = /\(#(\d+)\)\s*$/.exec(first) || /^Merge pull request #(\d+)/.exec(first);
+        var found = m ? Promise.resolve(Number(m[1]))
+          : lookups++ < 8
+            ? getJSON(api + "/commits/" + c.sha + "/pulls", function (prs) {
+              var pr = prs.filter(function (p) { return p.merged_at; })[0];
+              return pr ? pr.number : 0;
+            }).catch(function () { return 0; })
+            : Promise.resolve(0);
+        return found.then(function (num) {
+          if (num && byPr[num]) {
+            byPr[num].parent = c.parent;       // older commit of the same PR
+          } else {
+            if (changes.length === MAX_CHANGES) { return; }
+            var ch = {
+              sha: c.sha, parent: c.parent, pr: num || 0, url: c.url, date: c.date,
+              title: first, body: c.message.split("\n").slice(1).join("\n"), user: c.user
+            };
+            changes.push(ch);
+            if (num) { byPr[num] = ch; }
+          }
+          return step(i + 1);
+        });
+      }
+
+      return step(0).then(function () {
+        return Promise.all(changes.map(function (ch) {
+          if (!ch.pr) { return ch; }
+          return getJSON(api + "/pulls/" + ch.pr, function (p) {
+            return {
+              title: p.title, url: p.html_url, body: p.body || "", user: person(p.user),
+              mergedBy: person(p.merged_by), merged: p.merged_at
+            };
+          }).then(function (p) {
+            ch.title = p.title;
+            ch.url = p.url;
+            ch.body = p.body;
+            ch.user = p.user;
+            ch.mergedBy = p.mergedBy;
+            ch.date = p.merged || ch.date;
+            return ch;
+          }, function () { return ch; });
+        }));
+      });
+    });
+  }
+
+  function person(u) {
+    return u && u.login ? { login: u.login, url: u.html_url } : null;
+  }
+
+  /* A file at one commit, or null where it does not exist there. Commits
+     never change, so the answer is kept for the whole session. */
+  var RAW = {};
+  function raw(repo, sha, path) {
+    var url = "https://raw.githubusercontent.com/" + repo + "/" + sha + "/" +
+      path.split("/").map(encodeURIComponent).join("/");
+    if (!RAW[url]) {
+      RAW[url] = fetch(url).then(function (r) {
+        if (r.status === 404) { return null; }
+        if (!r.ok) { throw new Error("HTTP " + r.status); }
+        return r.text();
+      });
+    }
+    return RAW[url];
+  }
+
+  /* GET from the API, keep only what `pick` returns, and remember it for
+     CACHE_MS. `version` invalidates an entry early (a pull request's head). */
+  function getJSON(url, pick, version) {
+    var key = "mdip-gh:" + url + (version ? "@" + version : "");
+    try {
+      var hit = JSON.parse(sessionStorage.getItem(key));
+      if (hit && Date.now() - hit.t < CACHE_MS) { return Promise.resolve(hit.v); }
+    } catch (e) { /* storage off or full: fetch */ }
+    return fetch(url, { headers: { Accept: "application/vnd.github+json" } })
+      .then(function (r) {
+        if (!r.ok) { throw new Error("HTTP " + r.status); }
+        return r.json();
+      })
+      .then(function (json) {
+        var v = pick(json);
+        try { sessionStorage.setItem(key, JSON.stringify({ t: Date.now(), v: v })); }
+        catch (e) { /* not cached, still shown */ }
+        return v;
+      });
+  }
+
+  /* js-yaml, served next to this script, loaded only on pages that need it. */
+  var yamlLoad = null;
+  function loadYaml() {
+    if (window.jsyaml) { return Promise.resolve(); }
+    if (!yamlLoad) {
+      yamlLoad = new Promise(function (resolve, reject) {
+        var s = document.createElement("script");
+        s.src = SCRIPT_SRC.replace(/[^/]*$/, "") + "vendor/js-yaml.min.js";
+        s.onload = resolve;
+        s.onerror = reject;
+        document.head.appendChild(s);
+      });
+    }
+    return yamlLoad;
+  }
+
+  /* The first lines of a pull request description, as plain text: headings
+     ("## Summary") and list bullets are template scaffolding, not content. */
+  function excerpt(text) {
+    var t = (text || "")
+      .replace(/<!--[\s\S]*?-->/g, " ")
+      .replace(/^\s*#+\s.*$/gm, " ")
+      .replace(/^\s*(?:[-*+]|\d+\.)\s+/gm, " ")
+      .replace(/!?\[([^\]]*)\]\([^)]*\)/g, "$1")
+      .replace(/[*`]+/g, "")
+      .replace(/^\s*>\s?/gm, " ")
+      .replace(/\s+/g, " ")
+      .trim();
+    if (t.length <= EXCERPT) { return t; }
+    return t.slice(0, EXCERPT).replace(/\s+\S*$/, "").replace(/[\s.,;:-]+$/, "") + "...";
+  }
+
+  function dateLabel(iso) {
+    var d = new Date(iso);
+    if (isNaN(d)) { return iso; }
+    return d.toLocaleDateString("en-GB", { day: "numeric", month: "short", year: "numeric" });
+  }
+
+  function isObj(v) { return v && typeof v === "object" && !Array.isArray(v); }
+
+  function esc(s) {
+    return String(s === undefined || s === null ? "" : s)
+      .replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;")
+      .replace(/"/g, "&quot;");
+  }
 })();
diff --git a/overrides/assets/javascript/vendor/js-yaml.LICENSE b/overrides/assets/javascript/vendor/js-yaml.LICENSE
new file mode 100644
index 0000000..09d3a29
--- /dev/null
+++ b/overrides/assets/javascript/vendor/js-yaml.LICENSE
@@ -0,0 +1,21 @@
+(The MIT License)
+
+Copyright (C) 2011-2015 by Vitaly Puzrin
+
+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.
diff --git a/overrides/assets/javascript/vendor/js-yaml.min.js b/overrides/assets/javascript/vendor/js-yaml.min.js
new file mode 100644
index 0000000..bdd8eef
--- /dev/null
+++ b/overrides/assets/javascript/vendor/js-yaml.min.js
@@ -0,0 +1,2 @@
+/*! js-yaml 4.1.0 https://github.com/nodeca/js-yaml @license MIT */
+!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?t(exports):"function"==typeof define&&define.amd?define(["exports"],t):t((e="undefined"!=typeof globalThis?globalThis:e||self).jsyaml={})}(this,(function(e){"use strict";function t(e){return null==e}var n={isNothing:t,isObject:function(e){return"object"==typeof e&&null!==e},toArray:function(e){return Array.isArray(e)?e:t(e)?[]:[e]},repeat:function(e,t){var n,i="";for(n=0;n<t;n+=1)i+=e;return i},isNegativeZero:function(e){return 0===e&&Number.NEGATIVE_INFINITY===1/e},extend:function(e,t){var n,i,r,o;if(t)for(n=0,i=(o=Object.keys(t)).length;n<i;n+=1)e[r=o[n]]=t[r];return e}};function i(e,t){var n="",i=e.reason||"(unknown reason)";return e.mark?(e.mark.name&&(n+='in "'+e.mark.name+'" '),n+="("+(e.mark.line+1)+":"+(e.mark.column+1)+")",!t&&e.mark.snippet&&(n+="\n\n"+e.mark.snippet),i+" "+n):i}function r(e,t){Error.call(this),this.name="YAMLException",this.reason=e,this.mark=t,this.message=i(this,!1),Error.captureStackTrace?Error.captureStackTrace(this,this.constructor):this.stack=(new Error).stack||""}r.prototype=Object.create(Error.prototype),r.prototype.constructor=r,r.prototype.toString=function(e){return this.name+": "+i(this,e)};var o=r;function a(e,t,n,i,r){var o="",a="",l=Math.floor(r/2)-1;return i-t>l&&(t=i-l+(o=" ... 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diff --git a/overrides/assets/stylesheets/specifications.css b/overrides/assets/stylesheets/specifications.css
index 54aa65a..fc87ee8 100644
--- a/overrides/assets/stylesheets/specifications.css
+++ b/overrides/assets/stylesheets/specifications.css
@@ -1673,6 +1673,269 @@ buttons
 :is(.mdip-specs, .mdip-spec) li.spec-row { display: block; }
 :is(.mdip-specs, .mdip-spec) li.spec-row[hidden] { display: none; }
 
+/* -- adoption: known adopters over time ------------------------------------ */
+
+/* One series, so no legend: the heading names it. Time runs across, the count
+   runs up from zero, and only the latest value is written out. The plot is a
+   stretched SVG for the line, with the dots and labels laid over it in HTML so
+   they keep their shape at any width. */
+:is(.mdip-specs, .mdip-spec) .adopt-hist { margin-top: 1.1rem; }
+:is(.mdip-specs, .mdip-spec) .adopt-hist h3,
+:is(.mdip-specs, .mdip-spec) .hist__group {
+  display: flex;
+  align-items: center;
+  gap: .4em;
+  margin: 0 0 .5rem;
+  color: var(--ink-3);
+  font-size: .6rem;
+  font-weight: 700;
+  letter-spacing: .07em;
+  text-transform: uppercase;
+}
+
+/* Material centres a figure and shrinks it to its content (`width:
+   fit-content`, a flex column); the chart is a block as wide as the section. */
+:is(.mdip-specs, .mdip-spec) figure.adopt-chart {
+  display: block;
+  width: auto;
+  max-width: none;
+  margin: 0;
+  padding: 1.1rem 1rem .6rem 3.1rem;
+  border: 1px solid var(--line);
+  border-radius: var(--r-m);
+  background: var(--surface);
+  box-shadow: var(--sh-1);
+}
+
+:is(.mdip-specs, .mdip-spec) .adopt-chart__plot { position: relative; height: 8.5rem; }
+
+:is(.mdip-specs, .mdip-spec) .adopt-chart__plot svg {
+  position: absolute;
+  inset: 0;
+  width: 100%;
+  height: 100%;
+  overflow: visible;
+}
+:is(.mdip-specs, .mdip-spec) .adopt-chart__grid { stroke: var(--line); stroke-width: 1; stroke-dasharray: 3 3; }
+:is(.mdip-specs, .mdip-spec) .adopt-chart__base { stroke: var(--line-strong); stroke-width: 1; }
+:is(.mdip-specs, .mdip-spec) .adopt-chart__area { fill: var(--brand); opacity: .08; }
+:is(.mdip-specs, .mdip-spec) .adopt-chart__line {
+  fill: none;
+  stroke: var(--brand);
+  stroke-width: 2;
+  stroke-linejoin: round;
+  stroke-linecap: round;
+}
+
+:is(.mdip-specs, .mdip-spec) .adopt-chart__y {
+  position: absolute;
+  right: calc(100% + .55rem);
+  transform: translateY(-50%);
+  color: var(--ink-3);
+  font-size: .58rem;
+  font-variant-numeric: tabular-nums;
+  line-height: 1;
+  white-space: nowrap;
+}
+
+:is(.mdip-specs, .mdip-spec) .adopt-chart__dot {
+  position: absolute;
+  width: 8px;
+  height: 8px;
+  border-radius: 50%;
+  background: var(--brand);
+  box-shadow: 0 0 0 2px var(--surface);
+  transform: translate(-50%, -50%);
+  outline: none;
+}
+/* A larger, invisible hit area than the dot itself. */
+:is(.mdip-specs, .mdip-spec) .adopt-chart__dot::before { content: ""; position: absolute; inset: -9px; border-radius: 50%; }
+:is(.mdip-specs, .mdip-spec) .adopt-chart__dot:focus-visible { box-shadow: 0 0 0 2px var(--surface), 0 0 0 4px var(--brand); }
+
+:is(.mdip-specs, .mdip-spec) .adopt-chart__tip {
+  position: absolute;
+  bottom: calc(100% + .45rem);
+  left: 50%;
+  z-index: 2;
+  padding: .2rem .45rem;
+  border-radius: 6px;
+  background: var(--ink);
+  color: var(--bg);
+  font-size: .6rem;
+  font-weight: 600;
+  white-space: nowrap;
+  transform: translateX(-50%);
+  opacity: 0;
+  pointer-events: none;
+  transition: opacity .15s var(--ease);
+}
+:is(.mdip-specs, .mdip-spec) .adopt-chart__dot.is-last .adopt-chart__tip { left: auto; right: -.3rem; transform: none; }
+:is(.mdip-specs, .mdip-spec) .adopt-chart__dot:is(:hover, :focus) .adopt-chart__tip { opacity: 1; }
+
+:is(.mdip-specs, .mdip-spec) .adopt-chart__val {
+  position: absolute;
+  transform: translate(-100%, -170%);
+  color: var(--ink);
+  font-size: .7rem;
+  font-weight: 700;
+  font-variant-numeric: tabular-nums;
+  line-height: 1;
+  white-space: nowrap;
+  pointer-events: none;
+}
+
+:is(.mdip-specs, .mdip-spec) .adopt-chart__x {
+  display: flex;
+  justify-content: space-between;
+  margin-top: .45rem;
+  color: var(--ink-3);
+  font-size: .58rem;
+}
+
+/* The slate scheme sets its attribute on <body>, an ancestor of the roots. */
+[data-md-color-scheme="slate"] .mdip-spec .adopt-chart__line { stroke: var(--info); }
+[data-md-color-scheme="slate"] .mdip-spec .adopt-chart__area { fill: var(--info); }
+[data-md-color-scheme="slate"] .mdip-spec .adopt-chart__dot { background: var(--info); }
+[data-md-color-scheme="slate"] .mdip-spec .adopt-chart__dot:focus-visible { box-shadow: 0 0 0 2px var(--surface), 0 0 0 4px var(--info); }
+
+/* -- history --------------------------------------------------------------- */
+
+/* Each change is one row of a single card: what state it is in, what it is
+   called, who proposed and merged it, and the start of its description. The
+   field-by-field table is open for proposals, which are what a reader comes
+   to check, and folded for merged changes, whose result is already the page. */
+:is(.mdip-specs, .mdip-spec) .hist__group { margin-top: 1rem; }
+:is(.mdip-specs, .mdip-spec) .hist__group:first-child { margin-top: 0; }
+
+/* Element and class together: Material's `[dir=ltr] .md-typeset ol li`
+   indents and numbers list items at 0-2-2. */
+:is(.mdip-specs, .mdip-spec) ol.hist__list {
+  margin: 0;
+  padding: 0;
+  list-style: none;
+  border: 1px solid var(--line);
+  border-radius: var(--r-m);
+  background: var(--surface);
+  box-shadow: var(--sh-1);
+  overflow: hidden;
+}
+
+:is(.mdip-specs, .mdip-spec) ol.hist__list > li.hist__item { margin: 0; padding: .7rem .9rem .75rem; }
+:is(.mdip-specs, .mdip-spec) ol.hist__list > li.hist__item + li.hist__item { border-top: 1px solid var(--line); }
+
+:is(.mdip-specs, .mdip-spec) .hist__top {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: .5rem;
+  margin-bottom: .35rem;
+}
+:is(.mdip-specs, .mdip-spec) .hist__date {
+  color: var(--ink-3);
+  font-size: .62rem;
+  font-variant-numeric: tabular-nums;
+  white-space: nowrap;
+}
+
+:is(.mdip-specs, .mdip-spec) .hist__title {
+  display: inline;
+  color: var(--ink) !important;
+  font-family: "Raleway", system-ui, sans-serif;
+  font-size: .78rem;
+  font-weight: 700;
+  line-height: 1.35;
+  text-decoration: none;
+}
+:is(.mdip-specs, .mdip-spec) .hist__title:hover span:first-child { color: var(--brand); text-decoration: underline; }
+:is(.mdip-specs, .mdip-spec) .hist__num {
+  margin-left: .35em;
+  color: var(--ink-3);
+  font-family: "Poppins", system-ui, sans-serif;
+  font-size: .66rem;
+  font-weight: 500;
+}
+
+:is(.mdip-specs, .mdip-spec) .hist__by {
+  display: flex;
+  flex-wrap: wrap;
+  gap: .1rem .9rem;
+  margin: .25rem 0 0;
+  color: var(--ink-3);
+  font-size: .64rem;
+}
+:is(.mdip-specs, .mdip-spec) .hist__by a { font-weight: 600; }
+
+:is(.mdip-specs, .mdip-spec) .hist__desc {
+  margin: .35rem 0 0;
+  color: var(--ink-2);
+  font-size: .66rem;
+  line-height: 1.55;
+}
+
+:is(.mdip-specs, .mdip-spec) .hist__scroll {
+  margin-top: .55rem;
+  border: 1px solid var(--line);
+  border-radius: var(--r-s);
+  overflow-x: auto;
+}
+:is(.mdip-specs, .mdip-spec) .hist__t {
+  display: table;
+  width: 100%;
+  margin: 0;
+  border-collapse: collapse;
+  font-size: .64rem;
+  line-height: 1.45;
+}
+:is(.mdip-specs, .mdip-spec) .hist__t :is(th, td) {
+  padding: .35rem .6rem;
+  border: 0;
+  border-top: 1px solid var(--line);
+  text-align: left;
+  vertical-align: top;
+  overflow-wrap: anywhere;
+}
+:is(.mdip-specs, .mdip-spec) .hist__t thead th {
+  border-top: 0;
+  background: var(--surface-2);
+  color: var(--ink-3);
+  font-size: .58rem;
+  font-weight: 700;
+  letter-spacing: .05em;
+  text-transform: uppercase;
+}
+:is(.mdip-specs, .mdip-spec) .hist__t tbody th { width: 34%; color: var(--ink-2); font-weight: 600; }
+:is(.mdip-specs, .mdip-spec) .hist__old { color: var(--ink-3); }
+:is(.mdip-specs, .mdip-spec) .hist__new { color: var(--ink); font-weight: 600; }
+:is(.mdip-specs, .mdip-spec) .hist__t .is-empty { font-style: italic; font-weight: 400; color: var(--ink-3); }
+
+:is(.mdip-specs, .mdip-spec) details.hist__more { margin-top: .4rem; }
+:is(.mdip-specs, .mdip-spec) details.hist__more > summary {
+  display: inline-flex;
+  gap: .45em;
+  padding: 0;
+  color: var(--ink-3);
+  font-size: .62rem;
+  cursor: pointer;
+}
+:is(.mdip-specs, .mdip-spec) details.hist__more > summary:hover { color: var(--ink); }
+:is(.mdip-specs, .mdip-spec) details.hist__more > summary::-webkit-details-marker { display: none; }
+:is(.mdip-specs, .mdip-spec) .hist__n { color: var(--ink-3); font-weight: 400; }
+:is(.mdip-specs, .mdip-spec) .hist__n::before { content: "\00b7"; margin-right: .45em; }
+
+:is(.mdip-specs, .mdip-spec) .hist__extra { margin: .35rem 0 0; font-size: .62rem; }
+
+:is(.mdip-specs, .mdip-spec) .hist__note {
+  display: flex;
+  align-items: center;
+  flex-wrap: wrap;
+  gap: .35em;
+  margin: .35rem 0 0;
+  color: var(--ink-3);
+  font-size: .66rem;
+}
+:is(.mdip-specs, .mdip-spec) .hist__body > .hist__note:first-child { margin-top: 0; }
+:is(.mdip-specs, .mdip-spec) .hist__foot { margin: .8rem 0 0; }
+
 /* --------------------------------------------------------------------------
    Material <details> overrides
 
@@ -1686,7 +1949,8 @@ buttons
 :is(.mdip-specs, .mdip-spec) details.facet,
 :is(.mdip-specs, .mdip-spec) details.disclosure,
 :is(.mdip-specs, .mdip-spec) details.crit,
-:is(.mdip-specs, .mdip-spec) details.specs-defer {
+:is(.mdip-specs, .mdip-spec) details.specs-defer,
+:is(.mdip-specs, .mdip-spec) details.hist__more {
   display: block;
   overflow: visible;
   padding: 0;
@@ -1718,7 +1982,8 @@ buttons
 :is(.mdip-specs, .mdip-spec) details.facet > summary,
 :is(.mdip-specs, .mdip-spec) details.disclosure > summary,
 :is(.mdip-specs, .mdip-spec) details.crit > summary,
-:is(.mdip-specs, .mdip-spec) details.specs-defer > summary {
+:is(.mdip-specs, .mdip-spec) details.specs-defer > summary,
+:is(.mdip-specs, .mdip-spec) details.hist__more > summary {
   display: flex;
   align-items: center;
   /* Material bleeds the admonition title past its box with `margin: 0 -.6rem`,
@@ -1756,7 +2021,9 @@ buttons
 :is(.mdip-specs, .mdip-spec) details.crit > summary::before,
 :is(.mdip-specs, .mdip-spec) details.crit > summary::after,
 :is(.mdip-specs, .mdip-spec) details.specs-defer > summary::before,
-:is(.mdip-specs, .mdip-spec) details.specs-defer > summary::after {
+:is(.mdip-specs, .mdip-spec) details.specs-defer > summary::after,
+:is(.mdip-specs, .mdip-spec) details.hist__more > summary::before,
+:is(.mdip-specs, .mdip-spec) details.hist__more > summary::after {
   display: none;
   content: none;
 }
@@ -1770,6 +2037,8 @@ buttons
   padding: .55rem .75rem;
 }
 :is(.mdip-specs, .mdip-spec) details.specs-defer > summary { gap: .45em; padding: .5em .7em; font-size: .68rem; }
+:is(.mdip-specs, .mdip-spec) details.hist__more { border: 0; margin-top: .4rem; }
+:is(.mdip-specs, .mdip-spec) details.hist__more > summary { display: inline-flex; padding: 0; color: var(--ink-3); font-size: .62rem; }
 
 /* --------------------------------------------------------------------------
    Motion preference
diff --git a/scripts/spec_data.py b/scripts/spec_data.py
index 6fc388c..1032a1e 100644
--- a/scripts/spec_data.py
+++ b/scripts/spec_data.py
@@ -102,6 +102,9 @@
     ("microtransit_drt", "Microtransit/DRT"),
     ("taxi_ridehail", "Taxi/Ridehail"),
     ("bicycle", "Bicycle"),
+    ("bikeshare", "Bikeshare"),
+    ("shared_scooter", "Shared scooter"),
+    ("carsharing", "Carsharing"),
     ("pedestrian_accessibility", "Pedestrian/Accessibility"),
     ("parking", "Parking"),
 ])
@@ -183,7 +186,12 @@ def read_entry(path):
     `# Description` and any section added later are read the same way.
     """
     with open(path, encoding="utf-8") as fh:
-        text = fh.read().replace("\r\n", "\n")
+        return parse_entry(fh.read())
+
+
+def parse_entry(text):
+    """`read_entry` on text already in memory, such as a past git revision."""
+    text = text.replace("\r\n", "\n")
     if not text.startswith("---\n"):
         raise ValueError("does not start with a --- front matter block")
     end = text.find("\n---\n", 4)
diff --git a/scripts/spec_history.py b/scripts/spec_history.py
new file mode 100644
index 0000000..848e120
--- /dev/null
+++ b/scripts/spec_history.py
@@ -0,0 +1,119 @@
+"""Past values of the registry, read from the repository's git history.
+
+Every change to a file in data/ is a commit, so the history of a value needs
+no extra bookkeeping: each revision of a specification file is read back and
+parsed like the current one. Only the known adopters count is tracked today,
+for the chart in the Adoption section of each specification page.
+
+Everything here is best effort. Without git, outside a clone, or in a shallow
+clone the history is simply shorter or empty, and the page leaves the chart
+out rather than failing the build.
+"""
+
+from __future__ import annotations
+
+import subprocess
+
+import spec_data
+
+_CACHE = {}
+
+
+def _git(args, stdin=None):
+    return subprocess.run(["git", "-C", spec_data.ROOT] + args, input=stdin,
+                          capture_output=True, check=True).stdout
+
+
+def _revisions():
+    """{repository path: [(commit, commit date), ...]}, oldest first."""
+    log = _git(["log", "--reverse", "--format=%x00%H %cs", "--name-only", "--",
+                "data/" + spec_data.SPECS_DIR]).decode("utf-8")
+    out = {}
+    for block in log.split("\0")[1:]:
+        lines = [l for l in block.splitlines() if l.strip()]
+        sha, date = lines[0].split()
+        for path in lines[1:]:
+            out.setdefault(path, []).append((sha, date))
+    return out
+
+
+def _blobs(refs):
+    """Contents of many `<commit>:<path>` at once, None where a path is gone."""
+    if not refs:
+        return {}
+    raw = _git(["cat-file", "--batch"], ("\n".join(refs) + "\n").encode("utf-8"))
+    out, pos = {}, 0
+    for ref in refs:
+        end = raw.index(b"\n", pos)
+        header = raw[pos:end].decode("utf-8")
+        pos = end + 1
+        if header.endswith(" missing"):
+            out[ref] = None
+            continue
+        size = int(header.rsplit(" ", 1)[1])
+        out[ref] = raw[pos:pos + size].decode("utf-8", "replace")
+        pos += size + 1
+    return out
+
+
+def _adopters(text):
+    try:
+        front, _sections = spec_data.parse_entry(text)
+    except Exception:       # a broken revision is skipped, not fatal
+        return None, None
+    adoption = front.get("adoption") if isinstance(front, dict) else None
+    if not isinstance(adoption, dict):
+        return None, None
+    count = adoption.get("adopters_count")
+    if not isinstance(count, int) or isinstance(count, bool) or count < 0:
+        return None, None
+    return count, spec_data.as_text(adoption.get("adopters_count_updated")) or None
+
+
+def _committed_counts():
+    """{path: [(count, count date or None, commit date), ...]} from git.
+
+    A revision that leaves the count and its date as they were (any other edit
+    to the file) is not a new count, so it is skipped.
+    """
+    try:
+        head = _git(["rev-parse", "HEAD"]).decode().strip()
+    except (OSError, subprocess.CalledProcessError):
+        return {}
+    if head not in _CACHE:
+        try:
+            revisions = _revisions()
+            refs = ["%s:%s" % (sha, path) for path, revs in revisions.items()
+                    for sha, _date in revs]
+            blobs = _blobs(refs)
+        except (OSError, subprocess.CalledProcessError, ValueError):
+            revisions, blobs = {}, {}
+        counts = {}
+        for path, revs in revisions.items():
+            for sha, date in revs:
+                text = blobs.get("%s:%s" % (sha, path))
+                count, updated = _adopters(text) if text else (None, None)
+                seen = counts.setdefault(path, [])
+                if count is not None and (not seen or seen[-1][:2] != (count, updated)):
+                    seen.append((count, updated, date))
+        _CACHE.clear()
+        _CACHE[head] = counts
+    return _CACHE[head]
+
+
+def adopters_series(spec, today=None):
+    """Known adopters over time for one specification, oldest first.
+
+    One point per date: the date the count was taken (`adopters_count_updated`)
+    when the file gives one, otherwise the date of the commit that recorded
+    it. The file as it is now is the last point, so a local edit shows up in a
+    preview before it is committed. A later value for the same date replaces
+    the earlier one, because that is a correction rather than a new count.
+    """
+    committed = _committed_counts().get(spec["source_path"], [])
+    points = dict((updated or date, count) for count, updated, date in committed)
+    current = (spec["adopters_count"], spec["adopters_count_updated"])
+    if current[0] is not None and (not committed or committed[-1][:2] != current):
+        import datetime
+        points[current[1] or today or datetime.date.today().isoformat()] = current[0]
+    return [{"date": d, "count": points[d]} for d in sorted(points)]