独家

Exposure `<mv-exposure>`

用于共享和隐私设置的可见度仪表（共享对话框、帖子受众、个人资料隐私、项目可见性、日历共享、文件链接），读取它所包裹的控件，在用户确认之前告诉他们自己的暴露程度。

文化出处

《神偷：暗黑计划》，Looking Glass Studios（1998 年，游戏）。屏幕上的指示器时刻显示玩家的暴露程度，从隐藏到完全暴露，让人在迈出一步之前就知道自己有多显眼。在界面中，只保留了这一机制，用中性的图标块和分级刻度来呈现：分享或隐私表单中的控件汇成一个读数，受众越广读数越高，它会写明谁能看到该内容，列出抬高读数的因素并提供一键降低，并且把最广的那一档设为需要确认的慎重步骤。

工作原理

用于分享和隐私设置（分享对话框、帖子受众、个人资料隐私、项目可见性、日历共享、文件链接）的可见性刻度，读取它所包裹的控件，在用户确认之前告诉他们自己的暴露程度。单选按钮、选项、开关、文本字段和人员列表都带有声明式评分映射：data-exposure="3" 表示一个受众级别（最广的那个生效），data-exposure="+0.4" 表示一个修正值，它在所在档位内移动读数，但绝不改变受众（永不过期的链接、允许下载、外部访客）；也可以由 score(state) 函数完全接管。结果是一个平静的读数，从“Only you”到“Public on the internet”：一个色调随受众加深的图标块，一条逐档变高的分级轨道，用文字写出的档位，以及明确列出的受众（“Visible to: you, 4 people, and anyone at Acme with the link”）。下方按影响大小列出真正抬高读数的因素，每项都附带一键降低（“The link never expires → Expire in 7 days”），它会修改真实的控件并触发其 input/change 事件。升入更高档位时会发出可取消的 mv-exposure-raise（工作区策略可以否决，控件随即恢复）；达到或超过 confirm 的档位保持待定状态，带斜线纹和外环，并显示内联或浮动的确认提示，在确认或撤销之前会阻止原生表单提交。三种变体：bar（完整读数及因素）、badge（用于工具栏和编辑器的紧凑状态标签，可通过 for 监视另一个区域）和 inline（一句话加一个微型分级刻度）。

分类	表单
类型	Web Component（`<mv-exposure>`）
状态	稳定版
套件	信任与隐私
同时安装	button
Keywords	exclusive, culture, privacy, sharing, share-dialog, visibility, audience, permissions, access, public, link-sharing, gauge, meter, risk, confirmation, policy, settings, form

When to use

A share dialog must make clear who can open a document or file before the user copies the link or clicks Done
A post, profile or event audience selector should spell out the real reach, not just the option name
Several small settings (link expiry, downloads, guests) add up to more exposure than any single control suggests
Making something public must be deliberate and confirmed, or vetoed by an organization policy

Avoid when

You just need to show a measured quantity in a range (storage used, a score, completion) → use Progress instead
Access is temporary and elevated (admin mode, a time-boxed share) and must end on time → use Midnight instead
There is a single public/private toggle with no nuance: a switch with a clear description says it all → use Switch instead

安装

node scripts/add.mjs exposure --out ./src/marvelous

使用 Marvelous UI MCP 服务器的 AI 智能体：install_components({ slugs: ["exposure"], 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/dom.js, core/element.js, core/motion.js, core/position.js, components/exposure/exposure.js, components/exposure/exposure.css。

用法

快速开始，最小可运行标记：

<mv-exposure org="Acme">
  <select aria-label="Share with">
    <option data-exposure="0">Only me</option>
    <option data-exposure="2" selected>Everyone at Acme</option>
    <option data-exposure="4">Public on the internet</option>
  </select>
</mv-exposure>

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="ex-demo" style="width:min(100%,62rem);margin-inline:auto">
  <style>
    #ex-demo { display:grid; grid-template-columns:minmax(0,1.3fr) minmax(0,1fr); gap:1.25rem; align-items:start }
    #ex-demo .ex-card { display:grid; gap:1rem; padding:1.25rem; border:1px solid var(--mv-border); border-radius:var(--mv-radius-xl); background:var(--mv-surface); box-shadow:var(--mv-shadow-sm) }
    #ex-demo .ex-side { display:grid; gap:1.25rem; align-content:start }
    #ex-demo .ex-head h3, #ex-demo .ex-head h4 { margin:0; font-size:1rem; font-weight:650; letter-spacing:-.01em }
    #ex-demo .ex-head h4 { font-size:.9375rem }
    #ex-demo .ex-head p { margin:.125rem 0 0; color:var(--mv-fg-muted); font-size:.8125rem }
    #ex-demo .ex-form { display:grid; gap:1rem; margin:0 }
    #ex-demo .ex-label { display:block; margin-bottom:.375rem; color:var(--mv-fg); font-size:.8125rem; font-weight:600 }
    #ex-demo .ex-people { display:grid; gap:.125rem; margin:0; padding:0; list-style:none }
    #ex-demo .ex-person { display:grid; grid-template-columns:auto minmax(0,1fr) auto; align-items:center; gap:.625rem; padding:.3125rem 0; font-size:.8125rem }
    #ex-demo .ex-person b { display:block; font-weight:550 }
    #ex-demo .ex-person small { display:block; overflow:hidden; color:var(--mv-fg-muted); font-size:.75rem; text-overflow:ellipsis; white-space:nowrap }
    #ex-demo .ex-role { display:flex; align-items:center; gap:.375rem; color:var(--mv-fg-muted); font-size:.75rem }
    #ex-demo .ex-access .mv-choice-description { font-size:.75rem }
    #ex-demo .ex-row { display:grid; grid-template-columns:minmax(0,11rem) minmax(0,1fr); gap:1rem; align-items:end }
    #ex-demo .ex-row .mv-choice { padding-bottom:.125rem }
    #ex-demo .ex-foot { display:flex; align-items:center; justify-content:space-between; gap:.75rem 1rem; flex-wrap:wrap; padding-top:1rem; border-top:1px solid var(--mv-border) }
    #ex-demo .ex-foot .mv-choice { font-size:.8125rem }
    #ex-demo .ex-actions { display:flex; gap:.5rem; margin-inline-start:auto }
    #ex-demo .ex-log { margin:0; min-height:1.1rem; color:var(--mv-fg-subtle); font:.75rem/1.45 var(--mv-font-mono) }
    #ex-demo .ex-post { display:grid; gap:.75rem }
    #ex-demo .ex-post-tools { display:flex; align-items:center; gap:.75rem; flex-wrap:wrap }
    #ex-demo .ex-post-tools .mv-select { width:auto; min-width:10.5rem }
    #ex-demo .ex-post-tools .mv-choice { font-size:.8125rem }
    #ex-demo .ex-post-foot { display:flex; align-items:center; justify-content:space-between; gap:.75rem; padding-top:.75rem; border-top:1px solid var(--mv-border) }
    #ex-demo .ex-cal { display:grid; gap:.875rem }
    #ex-demo .ex-cal-grid { display:grid; grid-template-columns:1fr 1fr; gap:.75rem }
    #ex-demo .ex-cal-reading { padding:.625rem .75rem; border-radius:var(--mv-radius-md); background:var(--mv-bg-subtle); font-size:.8125rem; line-height:1.5 }
    @media (max-width:52rem) { #ex-demo { grid-template-columns:minmax(0,1fr) } }
    @media (max-width:30rem) { #ex-demo .ex-row, #ex-demo .ex-cal-grid { grid-template-columns:minmax(0,1fr) } }
  </style>

  <!-- 1 · Share dialog: bar variant, reading on top, factors with one-click reductions, public needs confirmation -->
  <section class="ex-card" aria-labelledby="ex-share-title">
    <div class="ex-head">
      <h3 id="ex-share-title">Share “Q4 launch plan”</h3>
      <p>Acme · Marketing › Launches · edited by Maya Chen 2 hours ago</p>
    </div>
    <mv-exposure id="ex-share" org="Acme" confirm="4" label="Who can see this document">
      <form class="ex-form" id="ex-share-form">
        <div data-exposure-reading></div>

        <div>
          <span class="ex-label" id="ex-people-label">People with access</span>
          <ul class="ex-people" aria-labelledby="ex-people-label" data-exposure="1" data-exposure-count=".ex-person" data-exposure-audience="{count} people" data-exposure-audience-one="1 person">
            <li class="ex-person">
              <span class="mv-avatar" data-size="sm" data-variant="tinted" aria-hidden="true"><span class="mv-avatar-fallback">MC</span></span>
              <span><b>Maya Chen (you)</b><small>[email protected]</small></span>
              <span class="ex-role">Owner</span>
            </li>
            <li class="ex-person">
              <span class="mv-avatar" data-size="sm" data-variant="tinted" aria-hidden="true"><span class="mv-avatar-fallback">DA</span></span>
              <span><b>Diego Alvarez</b><small>[email protected]</small></span>
              <span class="ex-role">Editor</span>
            </li>
            <li class="ex-person">
              <span class="mv-avatar" data-size="sm" data-variant="tinted" aria-hidden="true"><span class="mv-avatar-fallback">PN</span></span>
              <span><b>Priya Natarajan</b><small>[email protected]</small></span>
              <span class="ex-role">Commenter</span>
            </li>
            <li class="ex-person" id="ex-guest" data-exposure="+0.2" data-exposure-factor="A guest outside Acme has access" data-exposure-reduce-label="Remove guest">
              <span class="mv-avatar" data-size="sm" data-variant="tinted" aria-hidden="true"><span class="mv-avatar-fallback">JO</span></span>
              <span><b>Jordan Okafor</b><small>[email protected]</small></span>
              <span class="ex-role"><span class="mv-badge" data-variant="warning" data-size="sm">Guest</span>
                <button type="button" class="mv-button" data-variant="ghost" data-size="icon" data-exposure-remove aria-label="Remove Jordan Okafor" style="width:1.75rem;height:1.75rem">
                  <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" aria-hidden="true"><path d="M6 6l12 12M18 6 6 18"/></svg>
                </button>
              </span>
            </li>
          </ul>
        </div>

        <fieldset class="mv-choice-group ex-access">
          <legend>General access</legend>
          <label class="mv-choice">
            <input type="radio" class="mv-radio" name="access" value="restricted" data-exposure="0">
            <span class="mv-choice-text"><span class="mv-choice-title">Restricted</span><span class="mv-choice-description">Only the people above can open it</span></span>
          </label>
          <label class="mv-choice">
            <input type="radio" class="mv-radio" name="access" value="org" checked data-exposure="2" data-exposure-audience="anyone at Acme with the link" data-exposure-factor="Anyone at Acme with the link can open it" data-exposure-reduce="restricted" data-exposure-reduce-label="Restrict">
            <span class="mv-choice-text"><span class="mv-choice-title">Acme</span><span class="mv-choice-description">Anyone at Acme with the link</span></span>
          </label>
          <label class="mv-choice">
            <input type="radio" class="mv-radio" name="access" value="link" data-exposure="3" data-exposure-audience="anyone with the link" data-exposure-factor="Anyone with the link can open it, no sign-in" data-exposure-reduce="org" data-exposure-reduce-label="Limit to Acme">
            <span class="mv-choice-text"><span class="mv-choice-title">Anyone with the link</span><span class="mv-choice-description">No sign-in required</span></span>
          </label>
          <label class="mv-choice">
            <input type="radio" class="mv-radio" name="access" value="public" data-exposure="4" data-exposure-audience="anyone on the internet" data-exposure-factor="Listed publicly and indexed by search engines" data-exposure-reduce="link" data-exposure-reduce-label="Unlist" data-exposure-confirm="Anyone can find “Q4 launch plan” in search results and open it without signing in, including unreleased dates and pricing." data-exposure-confirm-label="Make public">
            <span class="mv-choice-text"><span class="mv-choice-title">Public on the web</span><span class="mv-choice-description">Searchable, no sign-in required</span></span>
          </label>
        </fieldset>

        <div class="ex-row">
          <div>
            <label class="ex-label" for="ex-expires">Link expires</label>
            <select class="mv-select" id="ex-expires" name="expires" data-size="sm">
              <option value="never" selected data-exposure="+0.4" data-exposure-factor="The link never expires" data-exposure-reduce="7d" data-exposure-reduce-label="Expire in 7 days">Never</option>
              <option value="30d" data-exposure="+0.2" data-exposure-factor="The link stays valid for 30 days" data-exposure-reduce="7d" data-exposure-reduce-label="Shorten to 7 days">In 30 days</option>
              <option value="7d">In 7 days</option>
              <option value="1d">In 24 hours</option>
            </select>
          </div>
          <label class="mv-choice" data-control="end">
            <input type="checkbox" role="switch" class="mv-switch" name="download" checked data-exposure="+0.2" data-exposure-factor="Viewers can download, print and copy">
            <span class="mv-choice-text"><span class="mv-choice-title">Allow downloads</span><span class="mv-choice-description">Viewers can download, print and copy</span></span>
          </label>
        </div>

        <div class="ex-foot">
          <label class="mv-choice"><input type="checkbox" role="switch" class="mv-switch" data-size="sm" id="ex-policy"> Workspace policy: no public documents</label>
          <span class="ex-actions">
            <button type="button" class="mv-button" data-variant="outline" data-size="sm" id="ex-reset">Reset</button>
            <button type="submit" class="mv-button" data-size="sm">Done</button>
          </span>
        </div>
      </form>
    </mv-exposure>
    <p class="ex-log" id="ex-log" aria-live="off">Pick “Public on the web”, or reduce a factor.</p>
  </section>

  <div class="ex-side">
    <!-- 2 · Post composer: badge variant watching the composer with `for`, custom bands -->
    <section class="ex-card" aria-labelledby="ex-post-title">
      <div class="ex-head">
        <h4 id="ex-post-title">New post</h4>
        <p>Posting as Maya Chen</p>
      </div>
      <div class="ex-post" id="ex-post">
        <textarea class="mv-textarea" rows="3" aria-label="Post text">Shipped the new onboarding flow today. Huge thanks to Diego and Priya for three weeks of late-night testing!</textarea>
        <div class="ex-post-tools">
          <select class="mv-select" data-size="sm" aria-label="Audience">
            <option value="me" data-exposure="0">Only me</option>
            <option value="close" data-exposure="1" data-exposure-audience="12 close friends">Close friends</option>
            <option value="friends" selected data-exposure="2" data-exposure-audience="your 348 friends">Friends</option>
            <option value="fof" data-exposure="3" data-exposure-audience="their friends, about 41,000 people">Friends of friends</option>
            <option value="public" data-exposure="4" data-exposure-audience="anyone, on or off the app" data-exposure-confirm="Anyone can see, share and embed this post, even without an account." data-exposure-confirm-label="Post publicly">Public</option>
          </select>
          <label class="mv-choice"><input type="checkbox" class="mv-checkbox" data-exposure="+0.3" data-exposure-factor="Your location is attached"> Add location · San Francisco</label>
        </div>
      </div>
      <div class="ex-post-foot">
        <mv-exposure for="ex-post" id="ex-badge" variant="badge" confirm="4" label="Post audience" bands="Only you, Close friends, Friends, Friends of friends, Public"></mv-exposure>
        <button type="button" class="mv-button" data-size="sm">Post</button>
      </div>
    </section>

    <!-- 3 · Calendar sharing: inline variant, reading placed where the author wants it -->
    <section class="ex-card" aria-labelledby="ex-cal-title">
      <div class="ex-head">
        <h4 id="ex-cal-title">Calendar sharing</h4>
        <p>Work calendar · Maya Chen · Pacific Time</p>
      </div>
      <mv-exposure variant="inline" org="Acme" label="Calendar visibility" class="ex-cal">
        <div class="ex-cal-grid">
          <div>
            <label class="ex-label" for="ex-cal-who">Share with</label>
            <select class="mv-select" id="ex-cal-who" data-size="sm">
              <option value="none" data-exposure="0">Nobody</option>
              <option value="team" selected data-exposure="1" data-exposure-audience="your 8 teammates">My team</option>
              <option value="org" data-exposure="2" data-exposure-audience="everyone at Acme">Everyone at Acme</option>
              <option value="public" data-exposure="4" data-exposure-audience="anyone with the public URL">Public URL</option>
            </select>
          </div>
          <div>
            <label class="ex-label" for="ex-cal-detail">They see</label>
            <select class="mv-select" id="ex-cal-detail" data-size="sm">
              <option value="busy">Free/busy only</option>
              <option value="titles" data-exposure="+0.4">Event titles</option>
              <option value="all" selected data-exposure="+0.8">All details</option>
            </select>
          </div>
        </div>
        <div class="ex-cal-reading" data-exposure-reading></div>
      </mv-exposure>
    </section>
  </div>

  <script type="module">
    const share = document.getElementById("ex-share");
    const form = document.getElementById("ex-share-form");
    const log = document.getElementById("ex-log");
    const policy = document.getElementById("ex-policy");
    const expires = document.getElementById("ex-expires");
    const guest = document.getElementById("ex-guest");
    const badge = document.getElementById("ex-badge");
    const say = (t) => { log.textContent = t; };

    // Icons that fit a social audience better than the default document scale.
    badge.bands = [
      { label: "Only you", icon: "lock" },
      { label: "Close friends", icon: "people" },
      { label: "Friends", icon: "people" },
      { label: "Friends of friends", icon: "link" },
      { label: "Public", icon: "globe" },
    ];

    // A restricted document has no link: its expiry no longer matters.
    const syncExpiry = () => { expires.disabled = form.elements.access.value === "restricted"; };
    form.addEventListener("change", syncExpiry);
    syncExpiry();

    // The guest chip's own remove button (the reduction runs it too).
    const removeGuest = guest.querySelector("[data-exposure-remove]");
    removeGuest.addEventListener("click", () => guest.remove());

    share.addEventListener("mv-exposure-raise", (e) => {
      if (policy.checked && e.detail.to === 4) {
        e.preventDefault();
        say("Blocked by workspace policy: public documents are turned off.");
        return;
      }
      say(`Raise: ${e.detail.fromLabel} → ${e.detail.toLabel}${e.detail.needsAck ? " (needs confirmation)" : ""}`);
    });
    share.addEventListener("mv-exposure-change", (e) => {
      say(`${e.detail.acknowledged ? "Confirmed" : "Now"}: ${e.detail.label} · ${e.detail.value.toFixed(1)} of 4`);
    });
    form.addEventListener("submit", (e) => {
      e.preventDefault();
      if (!share.pending) say(`Saved: ${share.bandLabel}. ${share.audience}.`);
    });

    // Reset the scenario (and put the guest back).
    const initial = { access: "org", expires: "never", download: true };
    document.getElementById("ex-reset").addEventListener("click", () => {
      if (!guest.isConnected) share.querySelector(".ex-people").append(guest);
      form.elements.access.value = initial.access;
      form.elements.download.checked = initial.download;
      syncExpiry();
      expires.value = initial.expires;
      share.refresh();
      say("Scenario reset.");
    });
  </script>
</div>

API

Attributes

Name	类型	Default	Description
`variant`	bar \| badge \| inline	`bar`	bar: the full reading (icon tile, band, audience, stepped track, scale, factors) in a subtle card. badge: a compact chip with the icon tile, the band and the audience, no card, factors hidden, acknowledgement floats. inline: one sentence led by a tiny stepped gauge, factors hidden, acknowledgement floats.
`org`	string		Organization name used in the default band “Anyone at {org}” and in {org} placeholders of audience and factor texts. Without it the band reads “Anyone in your organization”.
`confirm`	band index \| "top" \| (empty)		Bands at or above this index need an explicit acknowledgement before they apply; empty or "top" means the last band only. Without the attribute nothing needs confirming (mv-exposure-raise still fires).
`for`	id		Watch another element (a form, a composer) instead of the component’s children; the component then only holds the reading. Resolved in the component’s root node when it connects or when the attribute changes.
`bands`	comma-separated labels	`Only you, Specific people, Anyone at {org}, Anyone with the link, Public on the internet`	Band labels from the narrowest to the widest audience (at least 2). Icons are picked along lock, people, building, link, globe; use the bands property to choose them.
`label`	string	`Visibility`	Accessible name of the meter, also shown as the small caption above the band in the bar variant.
`show-factors`	"true" \| "false"		Show or hide the factor list. Default: shown in bar, hidden in badge and inline.
`data-exposure`	number \| +number \| -number		On any radio, checkbox, switch, option, text field or element in the watched region. A plain number is an audience level, active when the control is checked/selected/filled (or the element is present and not hidden); the highest active level sets the band. A signed number is a modifier: modifiers add up and move the reading inside the band (capped just below the next band), never across it. Disabled, hidden or inert contributors are ignored.
`data-exposure-audience`	string		Words added to the audience sentence while the contributor is active (“anyone at {org} with the link”). {count} and {org} are replaced; data-exposure-audience-one is used when the count is 1.
`data-exposure-count`	CSS selector		On a container (a people list): the number of matching descendants that are not hidden. The container is active when the count is above 0 and {count} is available to its audience text.
`data-exposure-factor`	string		Makes an active contributor a listed factor (“The link never expires”) whenever removing it would lower the reading. Factors are sorted by impact.
`data-exposure-reduce`	string		The one-click reduction of a factor. Radio: value of the radio to check instead. Option: value to select in its select. Checkbox or switch: unchecked (no value needed). Text field: the value to set (empty clears it). Other elements: the reduction clicks their [data-exposure-remove] button, so your own removal logic runs.
`data-exposure-reduce-label`	string		Label of the reduction button (“Expire in 7 days”). Defaults: “Switch to {option}”, “Turn off”, “Clear”, “Remove”.
`data-exposure-confirm / data-exposure-confirm-label`	string		On the contributor that opens a guarded band: the acknowledgement text (who can reach it and what that means) and the confirm button label (“Make public”).
`data-exposure-reading`	(marker)		On an empty child: the reading is rendered inside it instead of being appended at the end of the component.
`data-band / data-pending`	set by the component		Current band index and pending state, on the host (styleable).

Properties

Name	类型	Description
`value`	number	Current reading, from 0 to bands.length - 1 (read-only).
`band / bandLabel`	number / string	Index and label of the current band (read-only).
`audience`	string	The audience sentence, e.g. “Visible to: you, 4 people, and anyone at Acme with the link” (read-only).
`factors`	Array<{ label, impact, element, reduceLabel }>	Factors raising the reading, most impactful first (read-only).
`pending`	boolean	True while a guarded band waits for acknowledge() or revert() (read-only). Check it in your own save handler if the save does not go through a native form submission.
`bands`	Array`<string \| { label, icon? }>`	Band list; icon is one of lock, people, building, link, globe. Reading it returns the resolved objects. Setting a string sets the attribute.
`score`	(state) => number \| { value?, audience?, factors? } \| void	Custom scoring. state: { values (controls by name: radio value, checkbox boolean or array, select value), value, band, bands, audience (string[]), factors, contributors }. Return a number to replace the reading, or an object to replace the value, the audience parts and/or the factors ({ label, impact?, reduceLabel?, reduce?: () => void, confirm? }).
`strings`	Partial<Record<string, string>>	Overrides for every visible text and announcement (keys: label, you, orgFallback, visibleTo ({list}), factorsTitle, pending, ackTitle ({band}), ackText, ackConfirm, ackCancel, reduceTo ({option}), reduceToggle, reduceRemove, reduceClear, valueText, valueTextPending, announceUp, announceDown, announceSame, announcePending, announceConfirmed, announceReverted, announceBlocked, announceSubmit). English defaults.

Methods

Name	Description
`refresh()`	Re-reads the controls. Needed only after changing them from code without firing input/change events (frameworks setting .checked or .value); DOM changes (chips added or removed, hidden, disabled) are observed automatically.
`acknowledge()`	Accepts the pending band (same as the confirm button). Returns false when nothing is pending.
`revert()`	Restores every watched form control to the last accepted state and fires their input/change events; drops a pending band. Changes made outside form controls (a chip added by the app) cannot be undone by the component.
`reduce(indexOrElement)`	Applies a factor’s reduction from code (index in factors, or its contributor element). Emits the cancelable mv-exposure-reduce; returns false if cancelled or impossible.

Events

Name	Description
`mv-exposure-raise`	Cancelable, before a rise into a higher band is applied. detail: { from, to, fromLabel, toLabel, value, audience, needsAck, source (the control that changed, or null) }. preventDefault() vetoes it: the controls go back to the last accepted state and the refusal is announced.
`mv-exposure-change`	The accepted reading changed (band, value, audience or factors). detail: { value, band, label, audience, factors: [{ label, impact }], acknowledged }. Not emitted for the initial reading.
`mv-exposure-reduce`	Cancelable, before a factor’s reduction runs. detail: { label, impact, element }.

Content structure

Name	Description
`(content)`	The sharing or privacy controls to read (unless for is set). The component never restyles them; it only reads them and, for reductions or reverts, sets their value and fires input/change.

CSS classes

Name	Description
`mv-exposure`	The reading (data-variant, data-band, data-top, data-pending, data-flare during a rise).
`mv-exposure-gauge`	role="meter" wrapper: -head (-mark with -mark-icon, -caption, -band, -tag, -audience), -track (-step, -step-fill; data-lit), -scale.
`mv-exposure-factors`	Factor list: -factors-title, -list, -factor (-factor-icon, -factor-label, .mv-exposure-reduce button).
`mv-exposure-ack`	Acknowledgement group: -ack-icon, -ack-title, -ack-text, -ack-actions (.mv-exposure-cancel, .mv-exposure-confirm). data-floating when shown as a popover (badge and inline).

CSS variables

Name	Default	Description
`--mv-exposure-low`	`var(--mv-fg-subtle)`	Tone of the narrowest audience: the neutral end of the scale.
`--mv-exposure-high`	`var(--mv-warning)`	Tone the reading warms up to as the audience widens (bands are mixed between low and high).
`--mv-exposure-peak`	`color-mix(warning, danger 55%)`	Tone of the widest band, the pending tag and the acknowledgement.

Accessibility

The reading is a role="meter" named by label (“Visibility”), with aria-valuenow/min/max and an aria-valuetext that is the whole reading in words: “Anyone at Acme. Visible to: you, 4 people, and anyone at Acme with the link.” (with “needs confirmation” while pending). Its visible children are presentational, so screen readers get one coherent sentence instead of fragments. Band changes are announced once in a polite live region, debounced so arrowing through a radio group does not chatter (“Visibility raised to Anyone with the link. …”); a guarded band, a veto and a blocked submission are announced assertively. Focus is never moved when a control changes (arrow keys change radios immediately, so stealing focus would break keyboard use): the acknowledgement appears right after the reading in the DOM, as a labelled and described group with “Keep previous setting” and the confirm button; Escape inside it keeps the previous setting, and after either choice focus returns to the control that raised the band. Submitting the surrounding form while pending is prevented and moves focus to the confirm button. Reduction buttons are real buttons whose accessible name includes the factor (“Expire in 7 days: The link never expires”); after a reduction focus moves to the next factor (or to the meter) and the new reading is announced. The level is never carried by color alone: each band has its own words and icon (lock, people, building, link, globe), the steps grow in height, and a pending band adds a dashed ring, a hatched step and a “Needs confirmation” tag. Forced colors: steps and the icon tile switch to Canvas/CanvasText outlines, steps with a Highlight fill. Reduced motion (OS or data-motion="reduce"): no pulse, the tile and steps change without animating. Known limit: the acknowledgement follows the reading in the tab order, so when the reading sits above the controls a keyboard user reaches it with Shift+Tab (the assertive announcement says confirmation is needed, and submitting moves focus to it); put the reading after the controls, or use data-exposure-reading, when they are far apart.