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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>UK Age assurance requirements — check your html free</title>
<meta name="description" content="This free browser tool finds HTML age gates that Ofcom does not count as highly effective, including self-declared checkboxes, date-of-birth forms, and localStorage-only memory.">
<style>
:root{color-scheme:light}body{margin:0;font:15px/1.55 system-ui,-apple-system,"Segoe UI",sans-serif;background:#faf9f5;color:#1a1512}
.wrap{max-width:960px;margin:0 auto;padding:28px 18px 60px}h1{font-size:26px;margin:0 0 6px}.lede{color:#4a403a;margin:0 0 16px}
textarea{width:100%;min-height:260px;font:13px/1.45 ui-monospace,Menlo,Consolas,monospace;padding:12px;border:1px solid #d9d0c4;border-radius:8px;box-sizing:border-box}
.bar{display:flex;gap:10px;align-items:center;margin:12px 0}button{font:600 15px system-ui;padding:10px 18px;border:0;border-radius:8px;background:#1a1512;color:#fff;cursor:pointer}
input[type=date]{font:14px system-ui;padding:8px;border:1px solid #d9d0c4;border-radius:6px}
table{border-collapse:collapse;width:100%;font-size:14px;margin-top:10px}th,td{text-align:left;padding:8px 10px;border-bottom:1px solid #eee;vertical-align:top}th{font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:#7a6e65}
.sev.error{color:#a8551f;font-weight:700}.sev.warn,.sev.warning{color:#96691f}.ok{color:#2a6446;font-weight:600}.sum{font-weight:600}
.note{font-size:13px;color:#7a6e65;margin-top:18px}#paid{margin-top:22px;padding:14px 16px;border:1px solid #e2d8cb;border-radius:10px;background:#fffdfa}
</style>
<script data-grow-initializer="">!(function(){window.growMe||((window.growMe=function(e){window.growMe._.push(e);}),(window.growMe._=[]));var e=document.createElement("script");(e.type="text/javascript"),(e.src="https://faves.grow.me/main.js"),(e.defer=!0),e.setAttribute("data-grow-faves-site-id","U2l0ZTphZjljMzgyMC0yMmU5LTRhYjgtYTIxNS03OTRhMGY1N2ExYzM=");var t=document.getElementsByTagName("script")[0];t.parentNode.insertBefore(e,t);})();</script>
<!--yj-canon-s101--><link rel="canonical" href="https://getreadystack.com/tools/age-gate-lint"></head>
<body>
<div class="wrap">
<h1>UK Age assurance requirements — check your html free</h1>
<p class="lede">Finds age gates that Ofcom does not count as highly effective — self-declared 18+ checkboxes, date-of-birth forms, localStorage-only memory — in your HTML. Runs entirely in your browser — nothing is uploaded.</p>
<textarea id="src" spellcheck="false">&lt;!doctype html&gt;
&lt;html lang="en-GB"&gt;
&lt;head&gt;
  &lt;meta charset="utf-8"&gt;
  &lt;title&gt;Vapour Row — premium e-liquid, shipped from Manchester&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
  &lt;div id="age-gate" class="overlay"&gt;
    &lt;h1&gt;Are you over 18?&lt;/h1&gt;
    &lt;p&gt;By entering this site you confirm you are 18 or older.&lt;/p&gt;
    &lt;label&gt;&lt;input type="checkbox" id="confirm"&gt; I am over 18&lt;/label&gt;
    &lt;form id="dobForm"&gt;
      &lt;input type="text" name="dob" placeholder="DD/MM/YYYY"&gt;
      &lt;button type="submit"&gt;Enter&lt;/button&gt;
    &lt;/form&gt;
    &lt;p class="small"&gt;A debit card on file also proves your age at checkout.&lt;/p&gt;
  &lt;/div&gt;

  &lt;main id="shop" hidden&gt;
    &lt;h2&gt;Disposables, 20mg&lt;/h2&gt;
  &lt;/main&gt;

  &lt;script&gt;
    document.getElementById('confirm').addEventListener('change', function () {
      localStorage.setItem('ageVerified', 'true');
      document.cookie = 'age_ok=1; path=/; max-age=31536000';
      document.getElementById('age-gate').classList.add('gate-done');
      document.getElementById('shop').hidden = false;
    });
    if (localStorage.getItem('ageVerified') === 'true') {
      document.querySelector('#age-gate').classList.remove('overlay-gate');
      document.getElementById('shop').hidden = false;
    }
  &lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;</textarea>
<div class="bar"><button id="go">Check</button><label>as of <input type="date" id="today"></label></div>
<div id="out" aria-live="polite"></div>
<div id="paid"><strong>Free here:</strong> Scan the HTML file you have open and name every weak age gate, with its line number and the Ofcom clause it fails.. <strong>In the editor:</strong> Scan every HTML file in the workspace at once and export a dated evidence report you can keep and hand over. — that part asks for a licence key.</div>
<p class="note">Same engine as the VS Code extension, byte for byte.</p>
</div>
<script>var AGEGATE_RULES = [
  {
    "id": "self_declared_click",
    "sev": "high",
    "mode": "line",
    "re": "(i\\s*am\\s*(over\\s*)?(18|21)|i'?m\\s*(over\\s*)?(18|21)|are\\s*you\\s*(over\\s*)?(18|21)|confirm\\s*(that\\s*)?you\\s*are\\s*(over\\s*)?(18|21))",
    "flags": "i",
    "msg": "Self-declared age tick box. Ofcom lists self-declaration as not highly effective age assurance.",
    "clause": "Ofcom HEAA guidance, para 3.9 (self-declaration)",
    "fix": "Move the decision to an age-assurance provider or to the server; the visitor must not be able to answer for themselves.",
    "heaa_in_force": "2025-07-25",
    "max_fine_gbp": 18000000,
    "fine_pct_qualifying_revenue": 10
  },
  {
    "id": "dob_self_entry",
    "sev": "high",
    "mode": "line",
    "re": "(name|id)\\s*=\\s*[\"'][^\"']*(dob|date-?of-?birth|birthday|birthdate)",
    "flags": "i",
    "msg": "Date of birth typed by the visitor is the gate. A typed birth date is self-declaration wearing a form.",
    "clause": "Ofcom HEAA guidance, para 3.9",
    "fix": "Drop the field, or pass it to a provider that estimates or verifies rather than believes it."
  },
  {
    "id": "client_side_gate",
    "sev": "high",
    "mode": "line",
    "re": "(localStorage|sessionStorage)\\s*\\.\\s*(set|get)Item\\s*\\(\\s*[\"'][^\"']*(age|adult|over-?18|verif)",
    "flags": "i",
    "msg": "The pass is kept in browser storage, so the gate opens for anyone who edits one key.",
    "clause": "OSA 2023 s.12 — access must be effective, not advisory",
    "fix": "Keep the decision on the server and give the browser a signed, short-lived token."
  },
  {
    "id": "long_lived_pass",
    "sev": "med",
    "mode": "line",
    "re": "max-age\\s*=\\s*\\d{7,}",
    "flags": "i",
    "msg": "The age pass lasts months or years, so the check never repeats for a shared or resold device.",
    "clause": "Ofcom HEAA guidance — repeat checks",
    "fix": "Shorten the pass to a session or a small number of days and re-run the check after that.",
    "long_seconds": 10000000
  },
  {
    "id": "gate_removed_in_browser",
    "sev": "high",
    "mode": "line",
    "re": "classList\\s*\\.\\s*(remove|add|toggle)\\s*\\(\\s*[\"'][^\"']*(gate|overlay|agewall|age-?wall|modal-age)",
    "flags": "i",
    "msg": "The restricted page is already in the DOM and a class toggle uncovers it — view-source walks past the gate.",
    "clause": "OSA 2023 s.12",
    "fix": "Do not send the restricted markup until the server has seen a pass."
  },
  {
    "id": "payment_card_as_proof",
    "sev": "med",
    "mode": "line",
    "re": "\\b(debit|credit|payment)\\b[^\\n]{0,40}\\b(age|18\\+?|verif)",
    "flags": "i",
    "msg": "A card is used as proof of age. Ofcom excludes payment methods that are available to under-18s.",
    "clause": "Ofcom HEAA guidance — payment methods",
    "fix": "Only a card type restricted to over-18s counts; otherwise use a listed age-assurance method."
  },
  {
    "id": "disclaimer_only",
    "sev": "med",
    "mode": "line",
    "re": "(by\\s*(entering|continuing|using)[^\\n]{0,60}\\b(18|21|adult)|you\\s*must\\s*be\\s*(over\\s*)?(18|21))",
    "flags": "i",
    "msg": "A warning sentence stands in for a gate. A disclaimer is not age assurance.",
    "clause": "Ofcom HEAA guidance — general disclaimers",
    "fix": "Keep the sentence, but put a real check behind it."
  },
  {
    "id": "no_assurance_provider",
    "sev": "high",
    "mode": "absent_when_gate",
    "re": "(yoti|persona|veriff|onfido|jumio|luciditi|verifymy|k-?id|incode|age-?estimation|facial\\s*age|photo-?id\\s*match|open\\s*banking)",
    "flags": "i",
    "msg": "This page gates on its own. No listed age-assurance method (photo-ID match, facial age estimation, open banking, mobile-network check) appears anywhere in the file.",
    "clause": "Ofcom HEAA guidance, section 3 — the listed methods",
    "fix": "Hand the decision to one of the listed methods and keep the response server-side."
  }
]
;</script>
<script>/* Age Gate Lint — reads one HTML file and names every age gate Ofcom would not call
   highly effective. Same file runs in Node (extension) and in the browser (web page). */
(function (root, factory) {
  var RULES = (typeof module !== 'undefined' && module.exports)
    ? require('./rules.json')
    : root.AGEGATE_RULES;
  var api = factory(RULES);
  if (typeof module !== 'undefined' && module.exports) module.exports = api;
  root.AGEGATE_ENGINE = api;
})(typeof window !== 'undefined' ? window : globalThis, function (RULES) {

  var HEAA_IN_FORCE = '2025-07-25';           // Ofcom HEAA duties applied from this date
  var GATE_MARK = /(age-?gate|age-?wall|age-?verif|age-?check|over-?18|18\+|21\+|adult\s*content)/i;

  function lineOf(text, index) {
    var n = 1;
    for (var i = 0; i < index && i < text.length; i++) if (text.charCodeAt(i) === 10) n++;
    return n;
  }

  function daysBetween(a, b) {
    var ms = Date.parse(b + 'T00:00:00Z') - Date.parse(a + 'T00:00:00Z');
    if (isNaN(ms)) return null;
    return Math.round(ms / 86400000);
  }

  function check(text, opts) {
    text = String(text == null ? '' : text);
    opts = opts || {};
    var findings = [];
    var gateSignals = 0;
    var firstGateLine = 1;

    if (GATE_MARK.test(text)) {
      gateSignals++;
      firstGateLine = lineOf(text, text.search(GATE_MARK));
    }

    RULES.forEach(function (rule) {
      if (rule.mode !== 'line') return;
      var re = new RegExp(rule.re, (rule.flags || '') + 'g');
      var m;
      while ((m = re.exec(text)) !== null) {
        if (m[0] === '') { re.lastIndex++; continue; }
        gateSignals++;
        findings.push({
          check: rule.id,
          sev: rule.sev,
          msg: rule.msg + ' [' + rule.clause + ']',
          line: lineOf(text, m.index),
          fix: rule.fix,
          hit: m[0].trim().slice(0, 60)
        });
      }
    });

    RULES.forEach(function (rule) {
      if (rule.mode !== 'absent_when_gate') return;
      if (gateSignals === 0) return;
      var re = new RegExp(rule.re, rule.flags || '');
      if (re.test(text)) return;
      findings.push({
        check: rule.id,
        sev: rule.sev,
        msg: rule.msg + ' [' + rule.clause + ']',
        line: firstGateLine,
        fix: rule.fix,
        hit: ''
      });
    });

    findings.sort(function (a, b) { return a.line - b.line; });

    var today = opts.today || null;
    var exposedDays = today ? daysBetween(HEAA_IN_FORCE, today) : null;
    var high = findings.filter(function (f) { return f.sev === 'high'; }).length;

    return {
      findings: findings,
      summary: {
        gate_signals: gateSignals,
        high: high,
        med: findings.length - high,
        heaa_in_force: HEAA_IN_FORCE,
        exposed_days: exposedDays,
        rule_count: RULES.length
      }
    };
  }

  return { engine: { check: check }, RULES: RULES, RULE_COUNT: RULES.length, HEAA_IN_FORCE: HEAA_IN_FORCE };
});
</script>
<script>// ⛔뼈대 — kit/scaffold.py 가 찍는다 (s143). findings [{check,sev,msg,line?}] → 글/HTML. 같은 파일이 Node 와 브라우저에서 산다.
'use strict';
function escapeHtml(s) { return String(s == null ? '' : s).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;'); }
function summaryLine(res) {
  const f = (res && res.findings) || []; const e = f.filter(function (x) { return String(x.sev || 'error').toLowerCase().startsWith('err'); }).length;
  return f.length ? (f.length + ' finding' + (f.length === 1 ? '' : 's') + ' (' + e + ' error' + (e === 1 ? '' : 's') + ')') : 'Clean — no findings.';
}
function toText(res, label) {
  const f = (res && res.findings) || [];
  const lines = ['== ' + (label || '') + ' — ' + summaryLine(res)];
  f.forEach(function (x) { lines.push('  ' + String(x.sev || 'error').toUpperCase().slice(0, 4) + '  ' + (x.line ? 'L' + x.line + '  ' : '') + (x.check || x.id || '') + '  ' + (x.msg || x.message || '')); });
  return lines.join('\n');
}
function toHtml(res) {
  const f = (res && res.findings) || [];
  if (!f.length) return '<p class="ok">' + escapeHtml(summaryLine(res)) + '</p>';
  const rows = f.map(function (x) { return '<tr><td class="sev ' + escapeHtml(String(x.sev || 'error')) + '">' + escapeHtml(String(x.sev || 'error')) + '</td><td>' + (x.line ? 'L' + escapeHtml(x.line) : '') + '</td><td><code>' + escapeHtml(x.check || x.id || '') + '</code></td><td>' + escapeHtml(x.msg || x.message || '') + '</td></tr>'; }).join('');
  return '<p class="sum">' + escapeHtml(summaryLine(res)) + '</p><table><thead><tr><th>Level</th><th>Line</th><th>Check</th><th>What</th></tr></thead><tbody>' + rows + '</tbody></table>';
}
var AGEGATE_REPORT = { escapeHtml: escapeHtml, summaryLine: summaryLine, toText: toText, toHtml: toHtml };
if (typeof module !== 'undefined' && module.exports) module.exports = AGEGATE_REPORT;
else window.AGEGATE_REPORT = AGEGATE_REPORT;
</script>
<script>
(function(){
  var src=document.getElementById('src'), out=document.getElementById('out'), go=document.getElementById('go'), today=document.getElementById('today');
  today.value=new Date().toISOString().slice(0,10);
  function run(){ try { var res=window.AGEGATE_ENGINE.engine.check(src.value,{today:today.value}); out.innerHTML=window.AGEGATE_REPORT.toHtml(res); } catch(e){ out.innerHTML='<p class="sev error">Could not run: '+String(e.message||e)+'</p>'; } }
  go.onclick=run; if (src.value.trim()) run();
})();
</script>


<section data-yj-install="free" style="margin:2rem auto 1rem;max-width:46rem;padding:1.25rem 1.25rem;border:1px solid #cfe3d6;border-radius:12px;background:#f6fbf8;font:16px/1.6 system-ui,-apple-system,Segoe UI,sans-serif"><h2 style="margin:0 0 .4rem;font-size:1.2rem">Install free</h2><p style="margin:0 0 .8rem;color:#41505f">Free for the file open in your editor - no key, no limit. The workspace sweep and the report ask for a key.</p><a href="https://marketplace.visualstudio.com/items?itemName=ReadyStack.age-gate-lint" rel="noopener" data-yj-install-door="mp" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'age-gate-lint',src:'mp',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">VS Code Marketplace</a><a href="https://open-vsx.org/extension/readystack/age-gate-lint" rel="noopener" data-yj-install-door="ovsx" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'age-gate-lint',src:'ovsx',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">Open VSX (Cursor, VSCodium)</a><a href="https://www.npmjs.com/package/@readystack/age-gate-lint" rel="noopener" data-yj-install-door="npm" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'age-gate-lint',src:'npm',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">npm</a><a href="https://www.npmjs.com/package/@readystack/age-gate-lint" rel="noopener" data-yj-install-door="mcp" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'age-gate-lint',src:'mcp',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">MCP server (npx)</a><a href="https://hub.docker.com/r/getreadystack/age-gate-lint" rel="noopener" data-yj-install-door="docker" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'age-gate-lint',src:'docker',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">Docker Hub</a><pre style="margin:.5rem 0 0;padding:.6rem .8rem;background:#f3f5f8;border-radius:8px;font-size:.9rem;overflow:auto">ext install ReadyStack.age-gate-lint
npx @readystack/age-gate-lint &lt;file&gt;
npx @readystack/age-gate-lint --mcp</pre><p style="margin:.6rem 0 0;font-size:.92rem;color:#41505f"><a href="https://getreadystack.com/api/buy/cl/polar_cl_l6iN1uWt0FwWu7tBsczD0jWpP2vxFM54Wdwqb3KPi1G" rel="nofollow" style="color:#0f7b3f;text-decoration:underline">Team? One key for every ReadyStack linter, 5 seats, $149 once</a></p></section>
<section data-yj-alert="rule" style="margin:1rem auto 1.5rem;max-width:46rem;padding:1.1rem 1.25rem;border:1px solid #d9dee6;border-radius:12px;background:#fbfcfd;font:15px/1.55 system-ui,-apple-system,Segoe UI,sans-serif"><b style="font-size:1.05rem">Get the full rule table as a PDF</b><div style="opacity:.78;margin:.35rem 0 .8rem">All 8 rules Age Gate Lint — UK Online Safety Act checks, each with its source and date, on printable pages you can hand to your team or auditor. We email it now, and once more only if a rule changes. No newsletter.</div><div style="display:flex;gap:8px;flex-wrap:wrap"><input id="yjae" type="email" placeholder="you@example.com" style="flex:1;min-width:210px;padding:11px 13px;border:1px solid rgba(140,150,165,.34);border-radius:8px;background:#fff;color:inherit"><button id="yjab" style="padding:11px 18px;border-radius:8px;border:0;cursor:pointer;background:#0f7b3f;color:#fff;font:600 15px system-ui,sans-serif">Email me the PDF</button></div><div id="yjao" hidden style="margin-top:.6rem;color:#0f7b3f">Sent. It arrives within the hour - check spam too.</div><script>(function(){var b=document.getElementById("yjab"),e=document.getElementById("yjae");if(!b||!e)return;b.addEventListener("click",function(){var v=e.value.trim();if(!/.+@.+\..+/.test(v))return;try{localStorage.setItem("yj_em","1");}catch(_){}fetch(location.origin+"/api/subscribe",{method:"POST",headers:{"Content-Type":"application/json"},body:JSON.stringify({email:v,slug:"age-gate-lint",lang:"en",source:"rule_table"+((b.closest&&b.closest("section")&&b.closest("section").getAttribute("data-yj-moved"))?"_at_result":"")})}).then(function(r){var o=document.getElementById("yjao");o.hidden=false;if(!r.ok){o.textContent="Could not save - please try again.";}}).catch(function(){var o=document.getElementById("yjao");o.hidden=false;o.textContent="Could not save - please try again.";});});})();</script><script>(function(){var e=document.getElementById("yjae"),s=e&&e.closest?e.closest("section"):null,o=document.getElementById("out");if(!s||!o)return;var d=false;function mv(ev){if(d)return;if(ev&&ev.target&&s.contains(ev.target))return;d=true;var b=o;while(b.parentNode&&b.parentNode!==document.body&&b.parentNode.tagName!=="MAIN"&&b.parentNode.tagName!=="ARTICLE")b=b.parentNode;if(!b.parentNode||b===s||b.contains(s))return;try{b.parentNode.insertBefore(s,b.nextSibling);s.setAttribute("data-yj-moved","1");}catch(_){}}document.addEventListener("input",mv,true);document.addEventListener("change",mv,true);})();</script></section>

<section data-yj-cta="paid" style="margin:3rem auto;max-width:46rem;padding:1.5rem 1.25rem;border:1px solid #d8dee9;border-radius:12px;background:#fbfcfe;font:16px/1.6 system-ui,-apple-system,Segoe UI,sans-serif"><h2 style="margin:0 0 .5rem;font-size:1.25rem">Get the complete version <span class="yj-price">$29</span></h2><p style="margin:.25rem 0 1rem;color:#41505f">This page is the working piece. The full pack has everything below.</p><p style="margin:0 0 1rem;color:#41505f">8 rules for Ofcom's highly effective age assurance duty, in force since 25 July 2025, where the penalty ceiling is £18m (£18 million) or 10% of qualifying worldwide revenue. One sample vape </p><p style="margin:0 0 1rem;color:#5b6b7c;font-size:.94rem">A freelance web developer bills about $60/hour; a manual pass over one storefront's gate plus the written note is roughly half a day, near $240.</p><a href="https://getreadystack.com/api/buy/cl/polar_cl_GknOiuCJgINiCOFYgKw1rgbS8bdYvuQ2meGB82nNkkS" rel="nofollow" style="display:inline-block;padding:.7rem 1.3rem;border-radius:8px;background:#1b64f2;color:#fff;text-decoration:none;font-weight:600">Buy the full version — $29</a></section>
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<section data-yj="yj-facts-v1" style="max-width:920px;margin:48px auto 0;padding:0 20px;font-family:system-ui,sans-serif"><style>.yj-article p{font:400 15.5px/1.7 system-ui,sans-serif;color:#26313b;margin:0 0 12px;max-width:72ch}.yj-article h2,.yj-article h3,.yj-article h4{font:600 17px/1.35 system-ui,sans-serif;color:#1b1f24;margin:22px 0 8px}.yj-article table{border-collapse:collapse;margin:10px 0 16px;font:14px/1.45 system-ui,sans-serif}.yj-article th,.yj-article td{border:1px solid #e2e6ea;padding:6px 10px;text-align:left}.yj-article th{background:#f4f6f8}.yj-article pre{background:#0f1720;color:#e6edf3;padding:12px 14px;border-radius:8px;overflow:auto;font:13px/1.5 ui-monospace,Menlo,monospace}.yj-article code{font:13px ui-monospace,Menlo,monospace;background:#f1f3f5;padding:1px 4px;border-radius:3px}.yj-article pre code{background:none;padding:0}.yj-article ul,.yj-article ol{font:15px/1.6 system-ui,sans-serif;color:#26313b}</style><p style="font:400 13px/1.5 system-ui,sans-serif;color:#6b7680;margin:0 0 14px"><time datetime="2026-09-18">Updated 2026-09-18</time> · ReadyStack</p><script type="application/ld+json">{"@context":"https://schema.org","@type":"WebPage","dateModified":"2026-09-18","author":{"@type":"Organization","name":"ReadyStack"}}</script><h2 style="font:600 21px/1.3 system-ui,sans-serif;margin:0 0 6px;color:#1b1f24">Worked example</h2><p style="font:400 14.5px/1.5 system-ui,sans-serif;margin:0 0 16px;color:#5b6570">Real numbers from this tool, line by line.</p><div class="yj-article"><p><img src="https://getreadystack.com/img/promo/sku119983_result_card.jpg" alt="Age Gate Lint — UK Online Safety Act" loading="lazy" style="max-width:100%;border-radius:6px"></p>
<p>Thirteen weak points — ten of them high severity — in the age gate of one Manchester vape storefront&#x27;s landing page, and the whole gate is four lines of JavaScript.</p>
<p>The page looked finished. An overlay asks &quot;Are you over 18?&quot;, there is a tick box that says &quot;I am over 18&quot;, a box to type a birth date, and a sentence underneath: &quot;By entering this site you confirm you are 18 or older.&quot; Click through and the catalogue appears. That gate was written the way almost every small shop gate was written, and it has been out of step with the law since 25 July 2025, when Ofcom&#x27;s guidance on highly effective age assurance began to apply under the Online Safety Act 2023.</p>
<p>Ofcom&#x27;s guidance is unusually plain about what does not count. Self-declaration does not count. A birth date typed by the visitor does not count — it is self-declaration wearing a form. A general disclaimer does not count. A payment method that under-18s can also hold does not count. What does count is a listed method: photo-ID matching, facial age estimation, open banking, a mobile network operator check, a digital identity wallet. Ofcom enforces this, and the penalty ceiling is £18 million or 10% of qualifying worldwide revenue, whichever is greater.</p>
<p>The second half of the problem is not in the markup at all, it is in the script. On the test page the pass is written with localStorage.setItem(&#x27;ageVerified&#x27;, &#x27;true&#x27;), the cookie is set with max-age=31536000, and the overlay is taken away with classList.remove(). Every one of those decisions happens in the browser. The catalogue markup was already delivered before anyone answered anything; the gate only covered it. One key edit in dev tools, or one look at view-source, and the gate is not there.</p>
<p>Age Gate Lint reads one HTML file — markup and inline script together — against eight rules: self-declared clicks, typed birth dates, browser-storage passes, year-long cookies, DOM-resident content uncovered by a class toggle, cards used as proof, disclaimer-only gates, and pages that gate on their own with no listed method anywhere in them. On the test page it returned 13 findings, 10 high and 3 medium, each with a line number and the clause it fails.</p>
<p>The same engine was then run on a rewritten version of that page, where the server renders the catalogue only after a pass comes back from a listed provider and the result is held in a signed session cookie with max-age=1800. That page returned zero findings. The difference between the two files is not politeness or wording; it is where the decision is made.</p>
<p>That is the practical test for any gate you maintain: if a visitor can reach the restricted markup by editing something they own — a key, a cookie, a class — the gate is decorative. If the answer comes back from a listed method and the server holds it, the gate is a gate.</p>
<p>What this cannot do is see your server. A page that gates properly on the back end ships no restricted markup and reads as clean, which is the correct answer. It is a lint over the surface you actually control in the editor, not legal advice.</p>
<p>The free command reads the file you have open and finishes that job: all eight rules, every finding, every line. The engine is the same file that runs the free web page, so the answer is the same in either place. Costed the other way, a freelance web developer bills about $60 an hour and a manual pass over one storefront&#x27;s gate plus the written note is roughly half a day — near $240, and again after the next redesign.</p></div><h2 style="font:600 19px/1.3 system-ui,sans-serif;margin:30px 0 10px;color:#1b1f24">15 seconds — what it actually does</h2><video controls muted playsinline preload="none" poster="/img/promo/sku119983_result_card.jpg" style="width:100%;max-width:360px;border-radius:10px;display:block;margin:0 auto"><source src="/media/sku119983_short.mp4" type="video/mp4"></video><h2 style="font:600 21px/1.3 system-ui,sans-serif;margin:34px 0 6px;color:#1b1f24">Questions people ask</h2><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">What does Age Gate Lint actually check?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">It reads the HTML file you have open, inline script included, and names every part of your age gate that Ofcom&#x27;s guidance does not count as highly effective: self-declared tick boxes, typed birth dates, passes kept in localStorage, year-long cookies, and restricted markup uncovered by a class toggle. Each finding carries a line number and the clause it fails.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">Who is this for?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">Web developers and agency teams shipping UK storefronts for vapes, alcohol, gambling, knives or adult content, and anyone maintaining an age gate written before July 2025. If your gate makes its decision in the browser rather than on the server, this names every place that decision leaks.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">Why will a free HTML validator or a chatbot not do this?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">A general validator checks syntax, not Ofcom&#x27;s age assurance guidance, and a chatbot cannot see your repository or hand you line numbers you can act on. Age Gate Lint carries the eight rules as code, so the same page gives the same answer on every run and for every reviewer.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">What is free and what costs money?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">Free checks the file you have open and finishes that job: all eight rules, every finding, line numbers and clauses, no key asked. The paid version runs the same engine across every HTML file in the workspace in one pass and writes a dated evidence report you keep and can hand over.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">What would this cost without the extension?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">A freelance web developer bills about $60 an hour, and reading one storefront&#x27;s gate and writing the note is roughly half a day, so near $240 per site and again after each redesign. The extension is $29 once, with a and re-runs cost nothing.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">Why not just ask ChatGPT or another AI chat?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">A general AI chat answers from training data with a cutoff date, cannot read your repository and names no rule version. Age Verification Lint - UK Online Safety Act age gate checks the file you open against 8 rules, each naming its legal or official basis, from a rule set dated 2026-09-20, and points at the exact line with the fix. For a filing, an audit or a client you need that dated result on your own files.</p></details><script type="application/ld+json" data-yj="yj-faq-ld">{"@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [{"@type": "Question", "name": "What does Age Gate Lint actually check?", "acceptedAnswer": {"@type": "Answer", "text": "It reads the HTML file you have open, inline script included, and names every part of your age gate that Ofcom's guidance does not count as highly effective: self-declared tick boxes, typed birth dates, passes kept in localStorage, year-long cookies, and restricted markup uncovered by a class toggle. Each finding carries a line number and the clause it fails."}}, {"@type": "Question", "name": "Who is this for?", "acceptedAnswer": {"@type": "Answer", "text": "Web developers and agency teams shipping UK storefronts for vapes, alcohol, gambling, knives or adult content, and anyone maintaining an age gate written before July 2025. 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Your email only if you want the answer sent.</p><form onsubmit="return yjAsk(event)" style="display:grid;gap:8px"><textarea name="question" required minlength="10" maxlength="2000" rows="3" placeholder="Your question" style="font:14px/1.5 system-ui,sans-serif;padding:10px;border:1px solid #cfd6dd;border-radius:6px"></textarea><div style="display:flex;gap:8px;flex-wrap:wrap"><input type="email" name="email" placeholder="Email (optional)" style="flex:1;min-width:200px;font:14px system-ui,sans-serif;padding:9px 10px;border:1px solid #cfd6dd;border-radius:6px"><button type="submit" style="font:600 14px system-ui,sans-serif;padding:9px 18px;border:0;border-radius:6px;background:#1b1f24;color:#fff;cursor:pointer">Send</button></div><p id="yj-ask-msg" style="font:13px system-ui,sans-serif;margin:2px 0 0;color:#0a6238;min-height:1em"></p></form><script>function yjAsk(e){e.preventDefault();var f=e.target,m=document.getElementById("yj-ask-msg");m.style.color="#0a6238";fetch(location.origin+"/api/ask",{method:"POST",headers:{"Content-Type":"application/json"},body:JSON.stringify({sku:119983,slug:"age-gate-lint",lang:"en",question:f.question.value,email:f.email.value,page:location.pathname})}).then(function(r){if(!r.ok)throw 0;m.textContent="Thanks \u2014 noted. Answers land on this page and, if you left an email, in your inbox.";f.question.value="";}).catch(function(){m.style.color="#a8551f";m.textContent="Could not send. Please try again in a minute.";});return false;}</script></div></section><section class="yj-related" style="max-width:920px;margin:56px auto 40px;padding:0 20px"><h2 style="font:600 21px/1.3 system-ui,sans-serif;margin:0 0 6px;color:#1b1f24">Same job, next tool</h2><p style="font:400 14.5px/1.5 system-ui,sans-serif;margin:0 0 20px;color:#5b6570">Free in the browser. 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