独家
Lookalike <mv-lookalike>
针对一切冒充你所信任对象的仿冒检测：包裹邮件、聊天线程、表单或粘贴目标，提供你信任的身份（trusted="Acme Bank <acme-bank.com>, @quillpay.com, @harrowfield, Payroll <DE89 3704 …>"），作用域内的每个链接、发件人、邮件地址、@用户名、包名或用户名、IBAN 和钱包地址，包括纯文本以及你在字段中键入或粘贴的内容，都会与它们进行比对。
文化出处
小红帽，夏尔·佩罗（1697 年，寓言）。狼躺在外婆的床上，看起来几乎一模一样，女孩在为时已晚之前，一个接一个地注意到那些不对劲的细节。UI 会把每个链接、发件人或账户与用户信任的那个进行比较，并在点击之前逐一指出每个不对劲的细节。
工作原理
针对一切冒充你所信任对象的仿冒检测：包裹邮件、聊天线程、表单或粘贴目标，提供你信任的身份（trusted="Acme Bank <acme-bank.com>, @quillpay.com, @harrowfield, Payroll <DE89 3704 …>"），作用域内的每个链接、发件人、邮件地址、@用户名、包名或用户名、IBAN 和钱包地址，包括纯文本以及你在字段中键入或粘贴的内容，都会与它们进行比对。它借助一张紧凑的易混淆字符表识别同形字符（西里尔字母“а”、用数字“0”冒充“o”、用大写“I”冒充“l”、用“rn”冒充“m”、全角和带重音的字母），识别 punycode、拼写错误（通过加权编辑距离识别多出、缺失、调换或替换的字母）、添加的词（“acme-bank-secure.com”，诱饵词会被标出）、顶级域名替换、把品牌名用作子域名以及“[email protected]”这类 userinfo 伎俩、声称属于某个品牌但真实地址并不属于它的显示名称和链接文字，以及钱包地址投毒（开头和结尾相同，中间不同）。可疑项会加上波浪下划线和一个带文字的内联标记按钮；其面板把可疑字符串叠放在受信任字符串之上，每个不同的字符都会被高亮并编号，然后用平实的语言逐一解释每个不对劲的细节（“The “а” here is Cyrillic (U+0430), not the Latin letter “a”.”），给出一个判定等级（probably fine、looks like X、impersonates X）以及操作：Go to the real X、Use the real value（用于字段）、Continue anyway（可取消的 mv-lookalike-proceed）和 Report。点击被标记的链接会被拦截并弹出这一确认，随后以原生方式重放。分析逻辑是纯函数且不依赖 DOM（compare(a, b)、check(value, trusted)、checkLink(href, text, trusted)，也可通过 MvLookalike.compare 调用），因此同样的规则可以在服务器上运行。
| 分类 | 反馈 |
|---|---|
| 类型 | Web Component（<mv-lookalike>） |
| 状态 | 稳定版 |
| 套件 | 信任与隐私 |
| 同时安装 | button |
| Keywords | exclusive, culture, phishing, spoofing, impersonation, homoglyph, confusables, punycode, idn, typosquatting, lookalike-domain, link-safety, email-security, sender-verification, display-name, iban, wallet, address-poisoning, edit-distance, diff, security, trust |
When to use
- An inbox, support desk or chat shows links and senders that could impersonate your brand, your bank or your vendors
- A payout or wire form must catch a payee email, IBAN or wallet address that is one character off a saved one
- Admins paste domains, package names or usernames into allowlists and a near miss would open a hole
- A server check and the UI must explain a spoofed link with the same rules and the same wording
Avoid when
- The problem is hidden characters inside a typed value (zero-width spaces, exotic spaces, bidi controls), not imitation of a known name → use Invisibles instead
- There is no list of trusted identities to compare against: generic phishing detection needs a server-side reputation service
- A critical form value just needs to be echoed back for confirmation before submitting → use Read Back instead
安装
node scripts/add.mjs lookalike --out ./src/marvelous使用 Marvelous UI MCP 服务器的 AI 智能体：install_components({ slugs: ["lookalike"], target_dir: "<absolute path>/src/marvelous", framework: "react" })。
复制的文件（含依赖）：tokens/tokens.css, core/base.css, components/button/button.css, core/dismiss.js, core/dom.js, core/element.js, core/position.js, components/lookalike/lookalike.js, components/lookalike/lookalike.css。
用法
快速开始，最小可运行标记：
<mv-lookalike trusted="Acme Bank <acme-bank.com>">
<p>Your card is locked. Unlock it at <a href="https://acme-bank-secure.com/login">acme-bank-secure.com</a>.</p>
</mv-lookalike>标准标记，可在此基础上通过属性、data-* 和 CSS 变量进行定制：
<div id="lk-demo" style="width:min(100%,64rem);margin-inline:auto">
<style>
#lk-demo { display:grid; gap:1rem; align-content:start; font-size:.875rem }
#lk-demo .lk-grid { display:grid; grid-template-columns:minmax(0,1.35fr) minmax(0,1fr); gap:1rem; align-items:start }
#lk-demo .lk-card { min-width:0; border:1px solid var(--mv-border); border-radius:var(--mv-radius-xl); background:var(--mv-surface); box-shadow:var(--mv-shadow-sm); overflow:hidden }
#lk-demo .lk-bar { display:flex; align-items:center; gap:.5rem; height:2.75rem; padding:0 1rem; border-bottom:1px solid var(--mv-border); color:var(--mv-fg-muted); font-size:.75rem; font-weight:500 }
#lk-demo .lk-bar strong { color:var(--mv-fg); font-size:.8125rem; font-weight:600 }
#lk-demo .lk-bar .mv-badge { margin-inline-start:auto }
#lk-demo .lk-mail-head { display:grid; grid-template-columns:auto minmax(0,1fr); gap:.875rem; padding:1rem 1.125rem .875rem; border-bottom:1px solid var(--mv-border) }
#lk-demo .lk-avatar { display:grid; place-items:center; width:2.25rem; height:2.25rem; border-radius:50%; background:var(--mv-bg-emphasis); color:var(--mv-fg); font-size:.8125rem; font-weight:600 }
#lk-demo .lk-subject { margin:0 0 .25rem; font-size:1rem; font-weight:650; letter-spacing:-.01em; line-height:1.3 }
#lk-demo .lk-meta { margin:0; color:var(--mv-fg-muted); font-size:.8125rem; line-height:1.7 }
#lk-demo .lk-meta b { color:var(--mv-fg-subtle); font-weight:500; display:inline-block; min-width:2.25rem }
#lk-demo .lk-from { color:var(--mv-fg); font-weight:500 }
#lk-demo .lk-body { padding:1rem 1.125rem 1.125rem; line-height:1.65; color:var(--mv-fg) }
#lk-demo .lk-body > p { margin:0 0 .75rem }
#lk-demo .lk-body > p:last-child { margin:0; color:var(--mv-fg-muted); font-size:.75rem }
#lk-demo .lk-body a:not(.mv-button) { color:var(--mv-accent); text-decoration-color:color-mix(in oklab,var(--mv-accent) 40%,transparent); text-underline-offset:.2em }
#lk-demo .lk-form { display:grid; gap:.875rem; padding:1rem 1.125rem 1.125rem }
#lk-demo .lk-field { display:grid; gap:.375rem; min-width:0 }
#lk-demo .lk-field > span:first-child { color:var(--mv-fg-muted); font-size:.75rem; font-weight:500 }
#lk-demo .lk-row { display:flex; align-items:center; gap:.25rem; min-width:0 }
#lk-demo .lk-row .mv-input { flex:1 1 auto; min-width:0 }
#lk-demo .lk-mono { font-family:var(--mv-font-mono); font-size:.8125rem }
#lk-demo .lk-chat { display:grid; gap:.625rem; padding:1rem 1.125rem 1.125rem; max-height:13rem; overflow:auto }
#lk-demo .lk-msg { display:grid; grid-template-columns:auto minmax(0,1fr); gap:.625rem; align-items:start }
#lk-demo .lk-msg .lk-avatar { width:1.75rem; height:1.75rem; font-size:.6875rem }
#lk-demo .lk-msg-who { margin:0; font-size:.75rem; font-weight:600 }
#lk-demo .lk-msg-who span { color:var(--mv-fg-subtle); font-weight:400; margin-inline-start:.375rem }
#lk-demo .lk-msg-text { margin:.125rem 0 0; line-height:1.55 }
#lk-demo .lk-controls { display:flex; align-items:center; gap:.75rem 1.25rem; flex-wrap:wrap; padding:.875rem 1.125rem; border:1px solid var(--mv-border); border-radius:var(--mv-radius-xl); background:var(--mv-bg-subtle) }
#lk-demo .lk-controls .lk-sep { flex:1 1 0 }
#lk-demo .lk-ctl { display:flex; align-items:center; gap:.5rem; color:var(--mv-fg-muted); font-size:.75rem; font-weight:500 }
#lk-demo .lk-log { margin:0; min-height:1.25rem; color:var(--mv-fg-subtle); font:.75rem/1.4 var(--mv-font-mono); flex:1 1 100% }
#lk-demo .mv-choice { font-size:.8125rem }
@media (max-width:52rem) { #lk-demo .lk-grid { grid-template-columns:minmax(0,1fr) } }
</style>
<mv-lookalike id="lk-main" show-verified trusted="Acme Bank <acme-bank.com>, Quillpay <quillpay.com>, Harrowfield <harrowfield.io>, @harrowfield, Harrowfield payroll <DE89 3704 0044 0532 0130 00>, Treasury wallet <0x52908400098527886E0F7030069857D2E4169EE7>">
<div class="lk-grid">
<!-- An inbox message: sender, links and plain-text addresses are all checked -->
<article class="lk-card" aria-label="Email message">
<div class="lk-bar"><strong>Inbox</strong> · Finance shared mailbox <span class="mv-badge" data-variant="outline">Sep 24, 2026</span></div>
<header class="lk-mail-head">
<span class="lk-avatar" aria-hidden="true">AB</span>
<div style="min-width:0">
<h3 class="lk-subject">Unusual sign-in on your business account</h3>
<p class="lk-meta"><b>From</b> <span class="lk-from" data-lookalike>Acme Bank Security <[email protected]></span><br>
<b>To</b> [email protected]</p>
</div>
</header>
<div class="lk-body">
<p>Hi Maya, we noticed a sign-in to your Acme Bank business account from São Paulo, Brazil on Sep 23, 2026 at 11:42 PM.</p>
<p>If this wasn’t you, <a href="https://acmе-bank.com/secure/verify">confirm your identity</a> within 24 hours to avoid a hold on outgoing wires. You can also review recent activity at <a href="https://acme-bank.com.account-review.net/login">acme-bank.com/activity</a>.</p>
<p>Card payments on your account are processed by quillpay.co. For anything else, our help center is at <a href="https://acme-bank.com/help">acme-bank.com/help</a>.</p>
<p>Acme Bank · 400 Harbor Boulevard, Boston, MA 02210</p>
</div>
</article>
<div style="display:grid;gap:1rem;min-width:0">
<!-- A payment form: fields are checked as you type or paste -->
<form class="lk-card" aria-label="Send a payment" onsubmit="return false">
<div class="lk-bar"><strong>Send a payment</strong> · Payouts</div>
<div class="lk-form">
<label class="lk-field"><span>Payee email</span>
<span class="lk-row"><input class="mv-input" type="email" value="[email protected]" autocomplete="off"></span></label>
<label class="lk-field"><span>Payee IBAN</span>
<span class="lk-row"><input class="mv-input lk-mono" data-lookalike value="DE89 3704 0044 0532 0180 00" autocomplete="off" spellcheck="false"></span></label>
<label class="lk-field"><span>Treasury wallet (USDC)</span>
<span class="lk-row"><input class="mv-input lk-mono" data-lookalike value="0x5290c1b7f04a9d3e6628fb05ac91d7e30b4a9EE7" autocomplete="off" spellcheck="false"></span></label>
<label class="lk-field"><span>Try it: type or paste any link</span>
<span class="lk-row"><input class="mv-input" type="url" value="https://www.quillpay-support.com/invoices" autocomplete="off" spellcheck="false"></span></label>
</div>
</form>
<!-- A team chat: new messages are scanned as they arrive -->
<section class="lk-card" aria-label="Team chat">
<div class="lk-bar"><strong>#payouts</strong> · Team chat</div>
<div class="lk-chat" id="lk-chat">
<div class="lk-msg"><span class="lk-avatar" aria-hidden="true">JO</span><div><p class="lk-msg-who">Jonas Okafor<span>9:12 AM</span></p><p class="lk-msg-text">September payroll is approved, @harrowfield can release it.</p></div></div>
</div>
</section>
</div>
</div>
</mv-lookalike>
<div class="lk-controls">
<label class="mv-choice"><input type="checkbox" role="switch" class="mv-switch" id="lk-intercept" checked> Confirm before opening flagged links</label>
<span class="lk-ctl"><span id="lk-th-label">Flag from</span>
<mv-segmented id="lk-threshold" aria-labelledby="lk-th-label" name="threshold" value="lookalike">
<button value="fine">Similar</button>
<button value="lookalike">Look-alike</button>
<button value="impersonation">Impersonation</button>
</mv-segmented>
</span>
<span class="lk-sep"></span>
<button type="button" class="mv-button" data-variant="outline" data-size="sm" id="lk-incoming">Receive a chat message</button>
<p class="lk-log" id="lk-log" aria-live="polite">Click a flag, or a flagged link, to see what doesn’t match.</p>
</div>
<script type="module">
const lk = document.getElementById("lk-main");
const log = document.getElementById("lk-log");
const say = (text) => { log.textContent = text; };
// Demo only: never actually open the fake addresses.
lk.addEventListener("mv-lookalike-proceed", (e) => {
e.preventDefault();
lk.close();
say(`mv-lookalike-proceed · would continue to ${e.detail.href ?? e.detail.value} (cancelled in this demo)`);
});
lk.addEventListener("mv-lookalike-report", (e) => say(`mv-lookalike-report · ${e.detail.verdict}: ${e.detail.value}`));
lk.addEventListener("mv-lookalike-found", (e) => say(`mv-lookalike-found · ${e.detail.result.title}: ${e.detail.value}`));
lk.addEventListener("click", (e) => {
const real = e.target.closest?.(".mv-lookalike-real");
if (real) { e.preventDefault(); say(`Would open the real site: ${real.href}`); }
});
document.getElementById("lk-intercept").addEventListener("change", (e) => { lk.intercept = e.target.checked ? "true" : "false"; });
document.getElementById("lk-threshold").addEventListener("mv-change", (e) => { lk.threshold = e.detail.value; });
const incoming = [
["HT", "Harrowfield Treasury", "@harr0wfield here: urgent, update the payout wallet before 5 PM using the form at quillpay.help/payouts"],
["PL", "Priya Lal", "Invoices for Q3 are on harrowfield.io/finance, and the vendor list is at quillpaay.com/vendors"],
["AK", "Ana Kovač", "Heads-up, I got a text from acme-bnak.com asking me to confirm a transfer. Ignored it."],
];
let next = 0;
document.getElementById("lk-incoming").addEventListener("click", () => {
const [initials, who, text] = incoming[next++ % incoming.length];
const chat = document.getElementById("lk-chat");
const time = new Date().toLocaleTimeString("en-US", { hour: "numeric", minute: "2-digit" });
const msg = document.createElement("div");
msg.className = "lk-msg";
const avatar = Object.assign(document.createElement("span"), { className: "lk-avatar", textContent: initials });
avatar.setAttribute("aria-hidden", "true");
const body = document.createElement("div");
const name = Object.assign(document.createElement("p"), { className: "lk-msg-who", textContent: who });
name.append(Object.assign(document.createElement("span"), { textContent: time }));
body.append(name, Object.assign(document.createElement("p"), { className: "lk-msg-text", textContent: text }));
msg.append(avatar, body);
chat.append(msg);
chat.scrollTop = chat.scrollHeight;
});
</script>
</div>API
Attributes
| Name | 类型 | Default | Description |
|---|---|---|---|
trusted | comma-separated list | Trusted identities. Each entry is a domain (acme-bank.com, also trusts its subdomains and email addresses), an email domain (@quillpay.com), an address ([email protected], trusted by its domain), a handle or name (@harrowfield, left-pad) or an account (IBAN, 0x… or bc1… wallet). Prefix a label with the email syntax to name it in messages and buttons: “Acme Bank <acme-bank.com>”. The identities property replaces this list when set. | |
threshold | fine | lookalike | impersonation | lookalike | Lowest verdict that gets a flag (and link interception). fine also flags faint resemblances (“Probably fine”), impersonation only flags deliberate disguises. |
intercept | "true" | "false" | true | Clicks (and middle clicks) on flagged links open the explanation as a confirmation instead of navigating. Continue anyway replays the click natively, so target, rel and client-side routers behave as usual. |
scan | space-separated: links text fields | links text fields | What is checked: links (a[href] with http(s):, mailto: or //), text (domains, emails, @handles, IBANs and 0x wallets written in plain text, wrapped in a span.mv-lookalike-mark only when flagged) and fields (input[type=email], input[type=url] and any input or textarea with data-lookalike, on input, paste, change and blur). Elements with data-lookalike are always checked. |
show-verified | boolean | Exact matches of a trusted identity get a small shield-check mark with a “Verified: {label}” text alternative. | |
validate | boolean | Flagged fields get a custom validity message (form submission is blocked) until the user picks Use the real value or Continue anyway. | |
data-lookalike (on content) | empty | value | Checks this element: its text (“Acme Bank Security <[email protected]>” is parsed as display name + address), the attribute value if given, a link’s href, or a field’s value. data-lookalike-name="…" adds a display name to check against the address. data-lookalike-ignore skips a subtree. | |
data-lookalike-verdict (set on content) | impersonation | lookalike | fine | trusted | Set by the component on every flagged link, mark, element or field (styleable); data-lookalike-ack once the user chose Continue anyway. | |
data-found | boolean | Set on the element while at least one suspicious item is flagged. |
Properties
| Name | 类型 | Description |
|---|---|---|
identities | Array<string | { value, label?, href? }> | Trusted identities as data (replaces the trusted attribute). href overrides the “Go to the real X” destination (defaults to https://<domain>). Read it to get the parsed list with kinds. |
results | Array<{ element, value, verdict, result, acknowledged, reported }> | Every flagged or verified item currently in scope (read-only). |
strings | Partial<Record<string, string>> | Overrides for every visible text, announcement and difference message ({label}, {value}, {c}, {t}, {count}… placeholders; “{c}” renders as inline code). English defaults. |
threshold / intercept / scan / showVerified / validate | reflected | Mirror the attributes. |
Methods
| Name | Description |
|---|---|
MvLookalike.compare(candidate, trusted, { strings? }) | Static and pure (also exported as compare): compares one value with one identity. Returns { verdict: "trusted" | "impersonation" | "lookalike" | "fine" | "unrelated", score (0-1 resemblance), kind (domain | email | name | account), value, display, trusted, label, href, title, diffs: [{ n, type, key, vars, message }], rows: { shown, candidate, trusted } (segments { text, n, type, gap } for side-by-side rendering) }. No DOM, safe in Node, Deno, workers. |
MvLookalike.check(value, trusted[], options?) | Static and pure (also exported as check): compares a value with every identity and returns the most telling result (an exact match wins). checkLink(href, text, trusted) also flags link texts that claim another address. |
check(value) | Same as the static check, against this element’s identities. |
rescan() | Re-checks the whole scope now. Content added later (a new chat message, a re-render) is picked up automatically by a MutationObserver. |
open(element) / close() | Opens the explanation for a flagged link, field or marked element, or closes it. |
Events
| Name | Description |
|---|---|
mv-lookalike-found | A suspicious item was flagged (initial scan, new content or a field value). detail: { element, kind: "link" | "text" | "marked" | "field", value, verdict, result }. |
mv-lookalike-proceed | Cancelable. The user chose Continue anyway. detail: { element, kind, value, href (links), verdict, result }. preventDefault() keeps the warning (and, for an intercepted link, does not open it). |
mv-lookalike-report | The user chose Report (once per item; the flag then reads “· Reported”). detail: { element, kind, value, verdict, result }. Send it to your abuse or security endpoint. |
CSS classes
| Name | Description |
|---|---|
mv-lookalike-flag | Inline flag <button> placed right after the item (data-verdict, aria-expanded, data-ack, data-reported): an icon, .mv-lookalike-flag-text and a visually hidden verdict. |
mv-lookalike-mark | Span wrapped around a suspicious address found in plain text (never around unflagged text; unwrapped when no longer flagged). |
mv-lookalike-verified | Shield-check mark after exact matches with show-verified. |
mv-lookalike-panel | Explanation panel (non-modal dialog in the Popover API top layer, data-verdict, data-intercept): -head, -icon, -kicker, -title, -text, -close, -compare (rows of -label + -value with .mv-lookalike-diff / .mv-lookalike-gap and numbered .mv-lookalike-num), -diffs (the numbered explanations, .mv-lookalike-code), -status, -actions (-report, -proceed, -real, -use). |
CSS variables
| Name | Default | Description |
|---|---|---|
--mv-lookalike-danger | var(--mv-danger) | Tone of impersonations: underline, flag, highlights. |
--mv-lookalike-warn | var(--mv-warning) | Tone of look-alikes. |
--mv-lookalike-ok | var(--mv-success) | Tone of verified marks and of the trusted row’s highlights. |
Accessibility
Every flag is a real <button> with visible words (“Impersonation”, “Look-alike”, “Similar”) plus a visually hidden verdict (“: Impersonates Acme Bank. Show the differences.”), aria-haspopup="dialog", aria-expanded and aria-controls; the wavy underline is never the only signal. The panel is a labelled, described non-modal dialog inserted right after the flag (outside any label, link or button), so Tab moves on naturally; it receives focus when opened from a flag, and on an intercepted link focus goes to the safe action (Go to the real X) rather than Continue anyway. Escape or Close folds it and returns focus to the flag or link; an outside click or moving focus elsewhere closes it too. Differences are spelled out in text, never shown by color alone: the side-by-side rows keep the real characters, each difference is numbered in both rows and in an ordered list of sentences that name the character, its script and code point (“The “а” here is Cyrillic (U+0430), not the Latin letter “a”.”), what was added, missing, swapped or replaced; the numbers are aria-hidden duplicates of the list order. Flagged fields get an extra aria-describedby text with the verdict, an optional custom validity message (validate), and a polite announcement when a typed or pasted value becomes suspicious; new suspicious content (a chat message) is announced politely once per batch; the initial scan is silent. Verified marks carry a text alternative. The one-by-one reveal of the differences and highlights is disabled under reduced motion (OS or data-motion="reduce"), and forced-colors mode keeps highlights as system Mark colors with outlines.