diff --git a/.agents/notes/implemented/feature/2026-11-01-markdown-offline-chemistry-and-subscript.md b/.agents/notes/implemented/feature/2026-11-01-markdown-offline-chemistry-and-subscript.md
new file mode 100644
index 000000000..96de4d430
--- /dev/null
+++ b/.agents/notes/implemented/feature/2026-11-01-markdown-offline-chemistry-and-subscript.md
@@ -0,0 +1,69 @@
+# Agent 笔记：Markdown 离线化学公式与下标
+
+状态：已实现
+
+## 先说结论
+
+macOS 已有数学公式和 Mermaid 图表的离线引擎，不需要再造解析器或接在线服务。
+本次补上 KaTeX 的化学扩展 mhchem，使 `\ce{...}` 反应式和 `\pu{...}` 物理单位可用，
+并启用 Comrak 现成的下标扩展。macOS PlantUML 已由独立改动接入，见
+[离线 PlantUML 预览](2026-11-01-macos-offline-plantuml.md)；Windows 方言对齐等仍未完成，
+不能因这些 macOS 增强而把 Issue #706 当作整体完成。
+
+## 问题
+
+KaTeX 是把 LaTeX 数学语法转换为网页公式的成熟库，但基础库不包含 mhchem，
+后者是负责解析化学反应和单位的可选扩展。只打包基础库时，数学公式能显示，
+`\ce{H2O}` 却报未定义命令。共享 Markdown 解析器 Comrak 已支持上下标，
+此前只启用了上标，`H~2~O` 不能正确输出下标。
+
+## 决策
+
+- 从同版本 KaTeX 0.16.0 npm 分发包提取 mhchem，先验证整个归档的 SHA-512 完整性，
+  再固定脚本 SHA-256，保留源文件中被压缩分发去掉的版权和适配声明。
+- 模板按 KaTeX、mhchem、预览脚本顺序加载。现有公式渲染器继续使用 `trust: false`，
+  不接受公式引入脚本、网页或网络资源；运行时不下载任何依赖。
+- 开启 Comrak 的 `subscript`。单波浪线表示下标，双波浪线仍表示删除线，
+  代码中的字面语法保持原文。正确例子是 `H~2~O`，不要用正则替换全文中的 `~`，
+  否则代码、删除线和公式会被误改。
+- 共享输入加真实 WebKit 浏览器引擎回归，同时检查数学、化学、Mermaid 生成的 SVG、
+  脚注及回链，不能仅断言代码块带有语言类名就声称图表可用。
+
+## 考虑过的备选方案
+
+- 重新实现化学语法：已有与当前 KaTeX 完全匹配的成熟上游，不采用。
+- 运行时从 CDN 加载：离线失败且扩大网络和供应链边界，不采用。
+- 顺手升级 KaTeX、Mermaid 或把 Windows 解析器整体迁移：增加无关兼容性风险，
+  本批只填已证实缺口，不把两个平台现状混为一致。
+- 直接接入在线 PlantUML 服务器：会把用户文档发送到第三方，也不能离线，不采用。
+  PlantUML 的独立上游、分发和执行隔离由上述独立决策验证，不复用公式渲染的执行上下文。
+
+## 后果
+
+数学公式、化学反应、单位和上下标可以在无网络预览中共存，新增脚本与已有 KaTeX 版本绑定。
+代价是需要随 KaTeX 更新一起核对扩展、许可、来源哈希及真实引擎回归。
+GitHub 特有媒体及 Windows 方言对齐不是本批已交付能力；macOS PlantUML 的能力和限制以独立笔记为准。
+
+这些模板和第三方脚本是 Git 输入，构建复制后再签名，运行时只读加载。
+渲染状态仅在内存和非持久 WebKit 中存活，不新增缓存、下载或安装目录写入；
+资源复用清单显式排除整个 Markdown 预览资源，不跨工作树复制生成 bundle。
+这不改变代码签名或 Sparkle 增量更新所依赖的发布字节。
+
+## 验证
+
+- `cargo test --manifest-path rust/Cargo.toml -p lithe-core project::markdown::tests`。
+- `./.agents/skills/write-stable-tests/scripts/test-stability-macos.sh -- --filter MarkdownPreviewRichContentTests`：
+  深浅主题使用生产 Rust bridge 和打包模板，检查公式与可访问数学标记 MathML、图表、脚注和代码，
+  并比较运行前后全部预览文件 SHA-256，检查没有远程资源请求。
+- `node --test scripts/resources/test-reuse-worktree-resources.mjs`：拒绝跨工作树复制预览资源。
+- `./scripts/macos/verify/verify-runtime-bundle-immutability.sh`。
+
+原生组件测试不代替完整应用操作验收，Windows 运行时未在本批验证。
+
+## 适用范围
+
+- `rust/lithe-core/src/project/markdown.rs`
+- `macos/Sources/Lithe/Resources/MarkdownPreview/`
+- `macos/Tests/LitheTests/MarkdownPreviewRichContentTests.swift`
+- `shared/fixtures/editor/markdown-rich-content-v1.json`
+- `scripts/resources/worktree-resources.json`
diff --git a/docs/ci-builds.md b/docs/ci-builds.md
index 8ccddbf0b..fca45f68b 100644
--- a/docs/ci-builds.md
+++ b/docs/ci-builds.md
@@ -604,6 +604,13 @@ Inter 4.1 的 18 个静态 OTF（内部版本 4.001）及许可、JetBrains Mono
 
 以下目录不应直接复制或跨工作树共享：
 
+- Markdown 离线预览的模板、脚本、样式、字体和许可来自 Git 跟踪的
+  `macos/Sources/Lithe/Resources/MarkdownPreview/`。KaTeX 0.16.0 的 mhchem 扩展与现有
+  KaTeX 版本匹配，npm 归档完整性及文件 SHA-256 固定在 `THIRD_PARTY_NOTICES.md`。
+  输入与平台架构、工具链无关；构建时从当前 checkout 复制进 bundle 后签名，运行时仅只读加载，
+  不下载、不写回、不产生持久化渲染缓存，不影响签名和 Sparkle delta。生成 bundle 没有可靠的
+  跨 worktree identity stamp，`excludedResources.markdown-preview-assets` 走资源脚本的
+  通用拒绝路由，任何复制阶段都不得从其他工作树或安装 app 复用这些资源。
 - macOS Markdown PlantUML：Git 中的 `MarkdownPreview/vendor/plantuml/`、
   `plantuml.html` 与 `plantuml-renderer.js` 随当前 checkout 打包，来源为固定的
   MIT `@plantuml/core` 1.2026.9，归档 SHA-512、引擎 SHA-256 和上游 revision 见
diff --git a/macos/Sources/Lithe/Resources/MarkdownPreview/THIRD_PARTY_NOTICES.md b/macos/Sources/Lithe/Resources/MarkdownPreview/THIRD_PARTY_NOTICES.md
index c117280d3..7a6c801a4 100644
--- a/macos/Sources/Lithe/Resources/MarkdownPreview/THIRD_PARTY_NOTICES.md
+++ b/macos/Sources/Lithe/Resources/MarkdownPreview/THIRD_PARTY_NOTICES.md
@@ -4,6 +4,7 @@ All preview dependencies are bundled with Lithe and loaded from the application
 
 - Highlight.js 11.5.1 — BSD-3-Clause — `vendor/highlight-LICENSE`
 - KaTeX 0.16.0 and its fonts — MIT — `vendor/katex-LICENSE`
+- KaTeX 0.16.0 mhchem extension (mhchem 3.3.0 adaptation) — MIT / upstream Apache-2.0 notice — `vendor/mhchem-NOTICE`
 - Mermaid 11.14.0 — MIT — `vendor/mermaid-LICENSE`
 - D3 6.7.0 — ISC — `vendor/d3-LICENSE`
 - markmap-lib 0.14.1 — MIT — `vendor/markmap-lib-LICENSE`
@@ -12,6 +13,8 @@ All preview dependencies are bundled with Lithe and loaded from the application
 
 The Highlight.js browser bundle is the distribution already vendored by MiaoYan; its version banner and upstream license are preserved. The remaining files come from the matching npm distributions.
 
+`vendor/mhchem.min.js` comes from `https://registry.npmjs.org/katex/-/katex-0.16.0.tgz` (`package/dist/contrib/mhchem.min.js`), matching the bundled KaTeX runtime. The archive is verified with npm's SHA-512 integrity `sha512-wPRB4iUPysfH97wTgG5/tRLYxmKVq6Q4jRAWRVOUxXB1dsiv4cvcNjqabHkrOvJHM1Bpk3WrgmllSO1vIvP24w==`; the extracted file's SHA-256 is `5c0a121a8b490afc85860a522347aeb34fb508c6b23044e5d29f6b2194227b51`. The source copyright and adaptation notice are preserved separately because the minified distribution omits that header. This is a checked-in build input, never downloaded or modified at runtime.
+
 PlantUML uses the official JavaScript build's built-in Smetana layout engine. Graphviz/Viz.js, the URL encoder, optional standard libraries, themes, emoji and external include loaders are not bundled. Rendering is local in a nonpersistent, restricted WebView; the result is displayed as an SVG image, never injected into the document DOM.
 
 `vendor/plantuml/plantuml.js` comes unchanged from `https://registry.npmjs.org/@plantuml/core/-/core-1.2026.9.tgz` (`package/plantuml.js`, upstream Git revision `18d0aae311a4f1eb3723bb4b0ad939185e22f166`). npm archive integrity: `sha512-Qy46og9hEb+wOFtjUfniWkl/BDwHpDuebQX5rF+35s9PS2G4cKZf1iWw4E/ELLQ0pTkESPDoQTbKWcc3ZyVcVA==`. Script SHA-256: `21c049ce47d087eff61ae0836f9c62a2b0c0d2528a5f16c2247057544228fae7`. The npm release's MIT license and upstream notices are preserved in `vendor/plantuml/LICENSE` (line endings normalized to LF only). Versions before 1.2026.6 use different licensing and must not be substituted. These are Git-tracked build inputs, not runtime downloads or writable bundle state.
diff --git a/macos/Sources/Lithe/Resources/MarkdownPreview/index.html b/macos/Sources/Lithe/Resources/MarkdownPreview/index.html
index 19e8eb08a..1d34c85e4 100644
--- a/macos/Sources/Lithe/Resources/MarkdownPreview/index.html
+++ b/macos/Sources/Lithe/Resources/MarkdownPreview/index.html
@@ -10,6 +10,7 @@
   <link rel="stylesheet" href="preview.css">
   <script defer src="vendor/highlight.min.js"></script>
   <script defer src="vendor/katex.min.js"></script>
+  <script defer src="vendor/mhchem.min.js"></script>
   <script defer src="vendor/mermaid.min.js"></script>
   <script defer src="vendor/d3.min.js"></script>
   <script defer src="vendor/markmap-lib.min.js"></script>
diff --git a/macos/Sources/Lithe/Resources/MarkdownPreview/vendor/mhchem-NOTICE b/macos/Sources/Lithe/Resources/MarkdownPreview/vendor/mhchem-NOTICE
new file mode 100644
index 000000000..96a2706ac
--- /dev/null
+++ b/macos/Sources/Lithe/Resources/MarkdownPreview/vendor/mhchem-NOTICE
@@ -0,0 +1,279 @@
+KaTeX mhchem extension, distributed with KaTeX 0.16.0
+
+Upstream source notice (preserved from contrib/mhchem/mhchem.js):
+
+/* eslint-disable */
+/* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+
+/*************************************************************
+ *
+ *  KaTeX mhchem.js
+ *
+ *  This file implements a KaTeX version of mhchem version 3.3.0.
+ *  It is adapted from MathJax/extensions/TeX/mhchem.js
+ *  It differs from the MathJax version as follows:
+ *    1. The interface is changed so that it can be called from KaTeX, not MathJax.
+ *    2. \rlap and \llap are replaced with \mathrlap and \mathllap.
+ *    3. Four lines of code are edited in order to use \raisebox instead of \raise.
+ *    4. The reaction arrow code is simplified. All reaction arrows are rendered
+ *       using KaTeX extensible arrows instead of building non-extensible arrows.
+ *    5. \tripledash vertical alignment is slightly adjusted.
+ *
+ *    This code, as other KaTeX code, is released under the MIT license.
+ *
+ * /*************************************************************
+ *
+ *  MathJax/extensions/TeX/mhchem.js
+ *
+ *  Implements the \ce command for handling chemical formulas
+ *  from the mhchem LaTeX package.
+ *
+ *  ---------------------------------------------------------------------
+ *
+ *  Copyright (c) 2011-2015 The MathJax Consortium
+ *  Copyright (c) 2015-2018 Martin Hensel
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+
+KaTeX license:
+
+The MIT License (MIT)
+
+Copyright (c) 2013-2020 Khan Academy and other contributors
+
+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.
+
+Apache License 2.0 text for the upstream MathJax adaptation:
+
+
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+                           Version 2.0, January 2004
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+
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diff --git a/macos/Sources/Lithe/Resources/MarkdownPreview/vendor/mhchem.min.js b/macos/Sources/Lithe/Resources/MarkdownPreview/vendor/mhchem.min.js
new file mode 100644
index 000000000..84e1198de
--- /dev/null
+++ b/macos/Sources/Lithe/Resources/MarkdownPreview/vendor/mhchem.min.js
@@ -0,0 +1 @@
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n={a:r._goInner(t.a),b:r._goInner(t.b),p:r._goInner(t.p),o:r._goInner(t.o),q:r._goInner(t.q),d:r._goInner(t.d)};n.a&&(n.a.match(/^[+\-]/)&&(n.a="{"+n.a+"}"),e+=n.a+"\\,"),(n.b||n.p)&&(e+="{\\vphantom{X}}",e+="^{\\hphantom{"+(n.b||"")+"}}_{\\hphantom{"+(n.p||"")+"}}",e+="{\\vphantom{X}}",e+="^{\\smash[t]{\\vphantom{2}}\\mathllap{"+(n.b||"")+"}}",e+="_{\\vphantom{2}\\mathllap{\\smash[t]{"+(n.p||"")+"}}}"),n.o&&(n.o.match(/^[+\-]/)&&(n.o="{"+n.o+"}"),e+=n.o),"kv"===t.dType?((n.d||n.q)&&(e+="{\\vphantom{X}}"),n.d&&(e+="^{"+n.d+"}"),n.q&&(e+="_{\\smash[t]{"+n.q+"}}")):"oxidation"===t.dType?(n.d&&(e+="{\\vphantom{X}}",e+="^{"+n.d+"}"),n.q&&(e+="{\\vphantom{X}}",e+="_{\\smash[t]{"+n.q+"}}")):(n.q&&(e+="{\\vphantom{X}}",e+="_{\\smash[t]{"+n.q+"}}"),n.d&&(e+="{\\vphantom{X}}",e+="^{"+n.d+"}"));break;case"rm":e="\\mathrm{"+t.p1+"}";break;case"text":t.p1.match(/[\^_]/)?(t.p1=t.p1.replace(" ","~").replace("-","\\text{-}"),e="\\mathrm{"+t.p1+"}"):e="\\text{"+t.p1+"}";break;case"roman 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Unknown bond type ("+t.kind_+")"];break;case"frac":var o="\\frac{"+t.p1+"}{"+t.p2+"}";e="\\mathchoice{\\textstyle"+o+"}{"+o+"}{"+o+"}{"+o+"}";break;case"pu-frac":var a="\\frac{"+r._goInner(t.p1)+"}{"+r._goInner(t.p2)+"}";e="\\mathchoice{\\textstyle"+a+"}{"+a+"}{"+a+"}{"+a+"}";break;case"tex-math":e=t.p1+" ";break;case"frac-ce":e="\\frac{"+r._goInner(t.p1)+"}{"+r._goInner(t.p2)+"}";break;case"overset":e="\\overset{"+r._goInner(t.p1)+"}{"+r._goInner(t.p2)+"}";break;case"underset":e="\\underset{"+r._goInner(t.p1)+"}{"+r._goInner(t.p2)+"}";break;case"underbrace":e="\\underbrace{"+r._goInner(t.p1)+"}_{"+r._goInner(t.p2)+"}";break;case"color":e="{\\color{"+t.color1+"}{"+r._goInner(t.color2)+"}}";break;case"color0":e="\\color{"+t.color+"}";break;case"arrow":var i={rd:r._goInner(t.rd),rq:r._goInner(t.rq)},c="\\x"+r._getArrow(t.r);i.rq&&(c+="[{"+i.rq+"}]"),e=c+=i.rd?"{"+i.rd+"}":"{}";break;case"operator":e=r._getOperator(t.kind_);break;case"1st-level escape":e=t.p1+" ";break;case"space":e=" ";break;case"entitySkip":case"pu-space-1":e="~";break;case"pu-space-2":e="\\mkern3mu ";break;case"1000 separator":e="\\mkern2mu ";break;case"commaDecimal":e="{,}";break;case"comma enumeration L":e="{"+t.p1+"}\\mkern6mu ";break;case"comma enumeration M":e="{"+t.p1+"}\\mkern3mu ";break;case"comma enumeration S":e="{"+t.p1+"}\\mkern1mu ";break;case"hyphen":e="\\text{-}";break;case"addition compound":e="\\,{\\cdot}\\,";break;case"electron dot":e="\\mkern1mu \\bullet\\mkern1mu ";break;case"KV x":e="{\\times}";break;case"prime":e="\\prime ";break;case"cdot":e="\\cdot ";break;case"tight cdot":e="\\mkern1mu{\\cdot}\\mkern1mu ";break;case"times":e="\\times ";break;case"circa":e="{\\sim}";break;case"^":e="uparrow";break;case"v":e="downarrow";break;case"ellipsis":e="\\ldots ";break;case"/":e="/";break;case" / ":e="\\,/\\,";break;default:throw["MhchemBugT","mhchem bug T. Please report."]}return e},_getArrow:function(t){switch(t){case"->":case"\u2192":case"\u27f6":return"rightarrow";case"<-":return"leftarrow";case"<->":return"leftrightarrow";case"<--\x3e":return"rightleftarrows";case"<=>":case"\u21cc":return"rightleftharpoons";case"<=>>":return"rightequilibrium";case"<<=>":return"leftequilibrium";default:throw["MhchemBugT","mhchem bug T. Please report."]}},_getBond:function(t){switch(t){case"-":case"1":return"{-}";case"=":case"2":return"{=}";case"#":case"3":return"{\\equiv}";case"~":return"{\\tripledash}";case"~-":return"{\\mathrlap{\\raisebox{-.1em}{$-$}}\\raisebox{.1em}{$\\tripledash$}}";case"~=":case"~--":return"{\\mathrlap{\\raisebox{-.2em}{$-$}}\\mathrlap{\\raisebox{.2em}{$\\tripledash$}}-}";case"-~-":return"{\\mathrlap{\\raisebox{-.2em}{$-$}}\\mathrlap{\\raisebox{.2em}{$-$}}\\tripledash}";case"...":return"{{\\cdot}{\\cdot}{\\cdot}}";case"....":return"{{\\cdot}{\\cdot}{\\cdot}{\\cdot}}";case"->":return"{\\rightarrow}";case"<-":return"{\\leftarrow}";case"<":return"{<}";case">":return"{>}";default:throw["MhchemBugT","mhchem bug T. Please report."]}},_getOperator:function(t){switch(t){case"+":return" {}+{} ";case"-":return" {}-{} ";case"=":return" {}={} ";case"<":return" {}<{} ";case">":return" {}>{} ";case"<<":return" {}\\ll{} ";case">>":return" {}\\gg{} ";case"\\pm":return" {}\\pm{} ";case"\\approx":case"$\\approx$":return" {}\\approx{} ";case"v":case"(v)":return" \\downarrow{} ";case"^":case"(^)":return" \\uparrow{} ";default:throw["MhchemBugT","mhchem bug T. Please report."]}}}}(),a=a.default}()}));
\ No newline at end of file
diff --git a/macos/Tests/LitheTests/MarkdownPreviewRichContentTests.swift b/macos/Tests/LitheTests/MarkdownPreviewRichContentTests.swift
new file mode 100644
index 000000000..f049db501
--- /dev/null
+++ b/macos/Tests/LitheTests/MarkdownPreviewRichContentTests.swift
@@ -0,0 +1,112 @@
+import AppKit
+import CryptoKit
+import Foundation
+import Testing
+import WebKit
+@testable import Lithe
+
+@MainActor
+struct MarkdownPreviewRichContentTests {
+    @Test(arguments: ["light", "dark"])
+    func formulasChemistryMermaidAndFootnotesRenderOffline(appearance: String) async throws {
+        let root = URL(fileURLWithPath: #filePath)
+            .deletingLastPathComponent().deletingLastPathComponent()
+            .deletingLastPathComponent().deletingLastPathComponent()
+        let source = try JSONDecoder().decode(
+            Fixture.self,
+            from: Data(contentsOf: root.appendingPathComponent("shared/fixtures/editor/markdown-rich-content-v1.json"))
+        ).source
+        let html = try RustCoreBridge().markdownRender(source).get().html
+        let directory = try #require(MarkdownPreviewResources.directoryURL)
+        let before = try manifest(directory)
+        let coordinator = MarkdownPreviewWebView.Coordinator(scrollPosition: nil)
+        let configuration = WKWebViewConfiguration()
+        configuration.websiteDataStore = .nonPersistent()
+        let webView = WKWebView(frame: .zero, configuration: configuration)
+        webView.navigationDelegate = coordinator
+        webView.uiDelegate = WebMediaCaptureDenier.shared
+        let window = NSWindow(
+            contentRect: NSRect(x: 0, y: 0, width: 900, height: 700),
+            styleMask: [.titled], backing: .buffered, defer: false
+        )
+        window.isReleasedWhenClosed = false
+        window.contentView = webView
+        window.orderFront(nil)
+        defer {
+            webView.stopLoading()
+            webView.navigationDelegate = nil
+            webView.uiDelegate = nil
+            window.contentView = nil
+            window.close()
+        }
+
+        coordinator.loadTemplate(in: webView)
+        try #require(await waitForChanges(webViewChanges(webView), timeout: .seconds(5)) {
+            !webView.isLoading && webView.title == "Markdown Preview"
+        }, "The production preview template did not load")
+
+        let completed = TestGate()
+        var result: Result<Any, Error>?
+        webView.callAsyncJavaScript(
+            """
+            await window.LithePreview.update({ html, appearance });
+            const content = document.getElementById('content');
+            const math = content.querySelectorAll('[data-math-style]');
+            return {
+                formulas: math.length,
+                renderedFormulas: content.querySelectorAll('[data-math-style] .katex').length,
+                formulaErrors: content.querySelectorAll('.katex-error').length,
+                mathml: content.querySelectorAll('math').length,
+                mermaid: !!content.querySelector('.mermaid-shell svg'),
+                diagramErrors: content.querySelectorAll('.diagram-error').length,
+                subscript: Array.from(content.querySelectorAll('p > sub')).some(sub =>
+                    sub.textContent === '2' && sub.previousSibling?.textContent.endsWith('H') &&
+                    sub.nextSibling?.textContent.startsWith('O')),
+                superscript: Array.from(content.querySelectorAll('p > sup')).some(sup =>
+                    sup.textContent === '2' && sup.previousSibling?.textContent.endsWith('x')),
+                strikethrough: !!content.querySelector('del'),
+                code: Array.from(content.querySelectorAll('code')).some(code => code.textContent === 'H~2~O x^2^'),
+                footnote: !!content.querySelector('a[data-footnote-ref][href="#fn-note"]') &&
+                    !!content.querySelector('#fn-note a[data-footnote-backref]'),
+                remoteScripts: Array.from(document.scripts).some(script => /^https?:/.test(script.src)),
+                remoteResources: performance.getEntriesByType('resource').some(entry => /^https?:/.test(entry.name)),
+                appearance: document.documentElement.dataset.theme
+            };
+            """,
+            arguments: ["html": html, "appearance": appearance], in: nil, in: .page
+        ) {
+            result = $0
+            completed.open()
+        }
+        try #require(await completed.waitUntilOpen(timeout: .seconds(8)), "Rich Markdown rendering timed out")
+        let response = try #require(result)
+        let values = try #require(try response.get() as? [String: Any])
+        #expect(values["formulas"] as? Int == 3)
+        #expect(values["renderedFormulas"] as? Int == 3)
+        #expect(values["mathml"] as? Int == 3)
+        #expect(values["formulaErrors"] as? Int == 0)
+        #expect(values["diagramErrors"] as? Int == 0)
+        for key in ["mermaid", "subscript", "superscript", "strikethrough", "code", "footnote"] {
+            #expect(values[key] as? Bool == true, "Expected \(key): \(values)")
+        }
+        #expect(values["remoteScripts"] as? Bool == false)
+        #expect(values["remoteResources"] as? Bool == false)
+        #expect(values["appearance"] as? String == appearance)
+        #expect(try manifest(directory) == before, "Rendering must not mutate packaged preview resources")
+    }
+
+    private func manifest(_ directory: URL) throws -> [String: String] {
+        let files = try #require(FileManager.default.enumerator(at: directory, includingPropertiesForKeys: [.isRegularFileKey]))
+        var result: [String: String] = [:]
+        for case let file as URL in files {
+            guard try file.resourceValues(forKeys: [.isRegularFileKey]).isRegularFile == true else { continue }
+            result[String(file.path.dropFirst(directory.path.count))] = SHA256.hash(data: try Data(contentsOf: file))
+                .map { String(format: "%02x", $0) }.joined()
+        }
+        return result
+    }
+
+    private struct Fixture: Decodable {
+        let source: String
+    }
+}
diff --git a/rust/lithe-core/src/project/markdown.rs b/rust/lithe-core/src/project/markdown.rs
index 80f7c97a5..e1d451838 100644
--- a/rust/lithe-core/src/project/markdown.rs
+++ b/rust/lithe-core/src/project/markdown.rs
@@ -36,6 +36,7 @@ pub fn render(request: MarkdownRenderRequest) -> MarkdownRenderResponse {
     options.extension.autolink = true;
     options.extension.tasklist = true;
     options.extension.superscript = true;
+    options.extension.subscript = true;
     options.extension.footnotes = true;
     options.extension.inline_footnotes = true;
     options.extension.description_lists = true;
@@ -170,6 +171,26 @@ mod tests {
         assert!(output.contains("<mark>Safe</mark>"));
     }
 
+    #[test]
+    fn preserves_rich_content_for_offline_preview() {
+        let fixture: serde_json::Value = serde_json::from_str(include_str!(
+            "../../../../shared/fixtures/editor/markdown-rich-content-v1.json"
+        ))
+        .expect("rich Markdown fixture should decode");
+        let output = html(fixture["source"].as_str().expect("fixture source"));
+
+        assert!(output.contains("H<sub ") && output.contains(">2</sub>O"));
+        assert!(output.contains("x<sup ") && output.contains(">2</sup>"));
+        assert!(output.contains(">removed</del>"));
+        assert!(output.contains(">H~2~O x^2^</code>"));
+        assert_eq!(output.matches("data-math-style=\"inline\"").count(), 2);
+        assert_eq!(output.matches("data-math-style=\"display\"").count(), 1);
+        assert!(output.contains("\\ce{2 H2 + O2 -&gt; 2 H2O}"));
+        assert!(output.contains("\\pu{123 kJ}"));
+        assert!(output.contains("language-mermaid"));
+        assert!(output.contains("class=\"footnotes\""));
+    }
+
     #[test]
     fn preserves_html_alignment_and_inline_badges_without_allowing_styles() {
         let fixture: serde_json::Value = serde_json::from_str(include_str!(
diff --git a/scripts/resources/reuse-worktree-resources.mjs b/scripts/resources/reuse-worktree-resources.mjs
index e60fd04d8..b75534116 100644
--- a/scripts/resources/reuse-worktree-resources.mjs
+++ b/scripts/resources/reuse-worktree-resources.mjs
@@ -89,8 +89,9 @@ async function readRegistry() {
   // not reusable build inputs, even without plugin mirror staging.
   // Plugin host secrets and workspace state also take this rejection route,
   // never a download/cache validator: their identity belongs to the installation.
-  // PlantUML is a pinned Git input; neither another bundle nor live render state
-  // is a reusable resource. Its isolated WebView never writes packaged inputs.
+  // Offline Markdown libraries, including PlantUML, are pinned Git inputs.
+  // Rebuild the target checkout's template/vendor resources before signing.
+  // Generated bundles and live render state are never reusable resources.
   const excludedResources = registry.excludedResources ?? [];
   if (!Array.isArray(excludedResources)) throw new Error("Invalid excluded worktree resources");
   for (const resource of excludedResources) {
diff --git a/scripts/resources/test-reuse-worktree-resources.mjs b/scripts/resources/test-reuse-worktree-resources.mjs
index afe474469..09edb7b71 100644
--- a/scripts/resources/test-reuse-worktree-resources.mjs
+++ b/scripts/resources/test-reuse-worktree-resources.mjs
@@ -65,6 +65,17 @@ function reuse(extraArguments = []) {
 }
 
 try {
+  await test("offline Markdown preview assets come from Git, never another bundle", { timeout: 15000 }, async () => {
+    const registry = JSON.parse(await fs.readFile(path.join(scriptDirectory, "worktree-resources.json"), "utf8"));
+    const resource = registry.excludedResources.find(item => item.id === "markdown-preview-assets");
+    assert.equal(resource.reusable, false);
+    assert.ok(resource.locations.includes("macos/Sources/Lithe/Resources/MarkdownPreview/"));
+    assert.match(resource.identity, /SHA-256/);
+    const refused = reuse(["--resource", resource.id]);
+    assert.notEqual(refused.status, 0);
+    assert.match(diagnostics(refused), /markdown-preview-assets is isolated.*cannot be reused/);
+  });
+
   await test("offline PlantUML assets and live renderer state cannot cross worktrees", { timeout: 15000 }, async () => {
     const registry = JSON.parse(await fs.readFile(path.join(scriptDirectory, "worktree-resources.json"), "utf8"));
     const resource = registry.excludedResources.find(item => item.id === "markdown-plantuml-assets");
diff --git a/scripts/resources/worktree-resources.json b/scripts/resources/worktree-resources.json
index f61deaae4..192d6fe19 100644
--- a/scripts/resources/worktree-resources.json
+++ b/scripts/resources/worktree-resources.json
@@ -33,6 +33,16 @@
     }
   ],
   "excludedResources": [
+    {
+      "id": "markdown-preview-assets",
+      "reusable": false,
+      "locations": [
+        "macos/Sources/Lithe/Resources/MarkdownPreview/",
+        "<app-bundle>/Contents/Resources/Lithe_Lithe.bundle/MarkdownPreview/"
+      ],
+      "identity": "Git-tracked preview template and offline vendor scripts, styles, fonts and notices. KaTeX/mhchem versions, source archive integrity and extracted mhchem SHA-256 are fixed in THIRD_PARTY_NOTICES.md. Independent of platform architecture/toolchain; generated bundle copies have no reusable identity stamp.",
+      "reason": "Check out source via Git and copy this checkout's resources at build time before signing. Never copy another worktree's generated bundle or download/patch preview libraries at runtime. All rendering is in memory and the packaged files stay read-only, preserving code signatures and Sparkle delta baselines. Every reuse copy stage rejects this resource."
+    },
     {
       "id": "markdown-plantuml-assets",
       "reusable": false,
diff --git a/shared/fixtures/editor/markdown-rich-content-v1.json b/shared/fixtures/editor/markdown-rich-content-v1.json
new file mode 100644
index 000000000..d1f897a4a
--- /dev/null
+++ b/shared/fixtures/editor/markdown-rich-content-v1.json
@@ -0,0 +1,3 @@
+{
+  "source": "# Rich Markdown\n\nInline math $x^2 + y^2 = z^2$ and units $\\pu{123 kJ}$.\n\n$$\n\\ce{2 H2 + O2 -> 2 H2O}\n$$\n\nWater H~2~O, power x^2^, ~~removed~~ and `H~2~O x^2^`.\n\nReference[^note].\n\n[^note]: A real footnote.\n\n```mermaid\nflowchart LR\n  A[Source] --> B[Preview]\n```\n"
+}
diff --git a/shared/platform-feature-matrix/features/markdown-rendering.json b/shared/platform-feature-matrix/features/markdown-rendering.json
index f25c1e803..47ace76cc 100644
--- a/shared/platform-feature-matrix/features/markdown-rendering.json
+++ b/shared/platform-feature-matrix/features/markdown-rendering.json
@@ -2,12 +2,15 @@
   "id": "markdown-rendering",
   "area": "编辑器",
   "group": "Markdown",
-  "capability": "Markdown 预览与富文本渲染；macOS 内嵌 HTML 徽章保持行内排版和安全对齐，PlantUML 代码块可离线显示时序图与类图",
+  "capability": "Markdown 预览与富文本渲染；macOS 离线数学公式、mhchem 化学方程式与物理单位、Mermaid、脚注及上下标；内嵌 HTML 的徽章图片保持行内排版，并保留容器、段落与标题的安全对齐属性；PlantUML 代码块可离线显示时序图与类图",
   "macos": {
     "evidence": [
       "macos/Sources/Lithe/Views/Editor/MarkdownPreviewView.swift",
       "macos/Sources/Lithe/Core/Ports/MarkdownRendering.swift",
+      "macos/Sources/Lithe/Resources/MarkdownPreview/index.html",
+      "macos/Tests/LitheTests/MarkdownPreviewRichContentTests.swift",
       "rust/lithe-core/src/project/markdown.rs",
+      "shared/fixtures/editor/markdown-rich-content-v1.json",
       "macos/Sources/Lithe/Resources/MarkdownPreview/preview.css",
       "macos/Tests/LitheTests/MarkdownPreviewHTMLTests.swift",
       "shared/fixtures/editor/markdown-html-v1.json",
@@ -26,6 +29,6 @@
     "verificationStatus": "pending"
   },
   "owner": "Editor",
-  "verification": "使用代码高亮、表格、Mermaid、链接和相对路径 fixture 对比渲染结果。打开含上千个代码块的大型 Markdown 预览，渲染不卡住，编辑时预览不会先闪成未高亮的代码；代码里的 `$&`、`$1` 按原文显示。macOS 使用 markdown-html-v1.json 及仓库 README 验证：宽预览中同一段内多个徽章同行居中，窄分栏按可用宽度自然折行；div/p/h1 的 align 生效，显式 br 和普通段落保留，正文行内图片不拆行，相对图片与点击放大仍可用。深浅主题均检查，脚本、事件处理器、危险 URL 和任意 style 仍被剥离。 macOS PlantUML：在深浅主题打开时序图和类图 fenced block，离线生成可放大的 SVG 图片，不能在文档 DOM 执行 SVG；多个代码块顺序执行，切换文档拒绝旧结果；本地 include 被拒绝且保留源码与本地化提示，超大输入立即失败，关闭和取消释放渲染器；运行前后比较预览资源 SHA-256。",
-  "notes": "Windows 预览中屏幕外的段落、标题、列表和代码块使用 content-visibility: auto 跳过排版（表格除外，避免溢出被裁切）；8.6 万行文档打开预览的最长主线程任务由约 10 秒降到约 1.3 秒，滚动最长任务由约 3.8 秒降到约 0.23 秒。2026-11-01 #1623：macOS 图片不再全局 display:block，Core 保留 div/p/h1-h6 的 align，但不开放 style；新增共享输入和真实 WKWebView 回归。Windows 仍使用独立的简化解析器，未在本次修改或验证其 HTML 行为，整体运行验收状态保持 pending。 2026-11-01 PlantUML：仅 macOS 接入官方 MIT @plantuml/core 1.2026.9，使用内置 Smetana；独立非持久 WebView、固定资源白名单、256KiB 源码/4MiB SVG/4096px/八秒预算，输出为被动 SVG 图片。无在线服务器、Java、Graphviz、WASM 或跨文件 include；可选主题和扩展库不打包，Windows 未修改。"
+  "verification": "使用代码高亮、表格、Mermaid、链接和相对路径 fixture 对比渲染结果。打开含上千个代码块的大型 Markdown 预览，渲染不卡住，编辑时预览不会先闪成未高亮的代码；代码里的 `$&`、`$1` 按原文显示。macOS 在深浅主题运行 markdown-rich-content-v1.json：行内数学、块级化学反应、物理单位均生成可访问 MathML，没有 katex-error；Mermaid 生成真实 SVG，脚注链接及回链存在；H~2~O 与 x^2^ 正确，双波浪线仍是删除线，代码内语法保持原文。运行前后逐文件比较预览资源哈希，确认无网络脚本和远程资源请求、bundle 不变。macOS 使用 markdown-html-v1.json 及仓库 README 验证：宽预览中同一段内多个徽章同行居中，窄分栏按可用宽度自然折行；div/p/h1 的 align 生效，显式 br 和普通段落保留，正文行内图片不拆行，相对图片与点击放大仍可用。深浅主题均检查，脚本、事件处理器、危险 URL 和任意 style 仍被剥离。 macOS PlantUML：在深浅主题打开时序图和类图 fenced block，离线生成可放大的 SVG 图片，不能在文档 DOM 执行 SVG；多个代码块顺序执行，切换文档拒绝旧结果；本地 include 被拒绝且保留源码与本地化提示，超大输入立即失败，关闭和取消释放渲染器；运行前后比较预览资源 SHA-256。",
+  "notes": "Windows 预览中屏幕外的段落、标题、列表和代码块使用 content-visibility: auto 跳过排版（表格除外，避免溢出被裁切）；8.6 万行文档打开预览的最长主线程任务由约 10 秒降到约 1.3 秒，滚动最长任务由约 3.8 秒降到约 0.23 秒。2026-11-01 #1623：macOS 图片不再全局 display:block，Core 保留 div/p/h1-h6 的 align，但不开放 style；新增共享输入和真实 WKWebView 回归。2026-11-01 #706 增强第一批：macOS 加载与 KaTeX 0.16.0 匹配的离线 mhchem 3.3.0 扩展，Core 开启 Comrak 下标，并增加真实 WKWebView 的数学、化学、Mermaid、脚注和上下标回归。Windows 仍使用独立简化解析器，未在本批迁移，也未修改或验证其 HTML 行为；不能宣称 #706 已整体完成。完整产品和 Windows 真机验收保持 pending。 2026-11-01 PlantUML：仅 macOS 接入官方 MIT @plantuml/core 1.2026.9，使用内置 Smetana；独立非持久 WebView、固定资源白名单、256KiB 源码/4MiB SVG/4096px/八秒预算，输出为被动 SVG 图片。无在线服务器、Java、Graphviz、WASM 或跨文件 include；可选主题和扩展库不打包，Windows 未修改。"
 }