diff --git a/build-linux.js b/build-linux.js
index f79f7bf..348aa60 100644
--- a/build-linux.js
+++ b/build-linux.js
@@ -135,6 +135,10 @@ function appEntries() {
   const entries = [
     collectFile(path.join(ROOT, 'main.js'), `${app}/main.js`),
     collectFile(path.join(ROOT, 'preload.js'), `${app}/preload.js`),
+    collectFile(
+      path.join(ROOT, 'manga-online-preload.js'),
+      `${app}/manga-online-preload.js`
+    ),
     ...collectDir(path.join(ROOT, 'src'), `${app}/src`, (e) => e.name.startsWith('_test'))
   ];
 
diff --git a/build-mac.js b/build-mac.js
index 23ff41c..a562f47 100644
--- a/build-mac.js
+++ b/build-mac.js
@@ -273,6 +273,10 @@ async function build() {
   fs.mkdirSync(APP, { recursive: true });
   fs.copyFileSync(path.join(ROOT, 'main.js'), path.join(APP, 'main.js'));
   fs.copyFileSync(path.join(ROOT, 'preload.js'), path.join(APP, 'preload.js'));
+  fs.copyFileSync(
+    path.join(ROOT, 'manga-online-preload.js'),
+    path.join(APP, 'manga-online-preload.js')
+  );
   copyDir(path.join(ROOT, 'src'), path.join(APP, 'src'), (e) => e.name.startsWith('_test'));
   const iconDir = path.join(APP, 'icons', 'dist');
   fs.mkdirSync(iconDir, { recursive: true });
diff --git a/build-portable.js b/build-portable.js
index 45f321b..0bfe75a 100644
--- a/build-portable.js
+++ b/build-portable.js
@@ -165,6 +165,10 @@ async function build() {
   fs.mkdirSync(APP, { recursive: true });
   fs.copyFileSync(path.join(ROOT, 'main.js'), path.join(APP, 'main.js'));
   fs.copyFileSync(path.join(ROOT, 'preload.js'), path.join(APP, 'preload.js'));
+  fs.copyFileSync(
+    path.join(ROOT, 'manga-online-preload.js'),
+    path.join(APP, 'manga-online-preload.js')
+  );
   copyDir(path.join(ROOT, 'src'), path.join(APP, 'src'), (e) => e.name.startsWith('_test'));
   const iconDir = path.join(APP, 'icons', 'dist');
   fs.mkdirSync(iconDir, { recursive: true });
diff --git a/build-release.js b/build-release.js
index a28e71f..4201ab8 100644
--- a/build-release.js
+++ b/build-release.js
@@ -114,7 +114,12 @@ async function verifyWindowsZip(file) {
   const JSZip = require('jszip');
   const zip = await JSZip.loadAsync(fs.readFileSync(file));
   const names = Object.keys(zip.files).map((n) => n.replace(/^[^/]+\//, ''));
-  requireEntries(names, [`${PRODUCT}.exe`, 'resources/app/main.js', 'locales/zh-CN.pak']);
+  requireEntries(names, [
+    `${PRODUCT}.exe`,
+    'resources/app/main.js',
+    'resources/app/manga-online-preload.js',
+    'locales/zh-CN.pak'
+  ]);
   forbidEntries(names, [/^data\//, /(^|\/)_test\//]);
 }
 
@@ -131,7 +136,13 @@ async function verifyDmg(file) {
 async function verifyLinuxTarball(file) {
   const entries = readTarEntries(zlib.gunzipSync(fs.readFileSync(file)));
   const names = entries.map((e) => e.name.replace(/^[^/]+\//, ''));
-  requireEntries(names, [PRODUCT, `${PRODUCT}.sh`, 'resources/app/main.js', 'locales/zh-CN.pak']);
+  requireEntries(names, [
+    PRODUCT,
+    `${PRODUCT}.sh`,
+    'resources/app/main.js',
+    'resources/app/manga-online-preload.js',
+    'locales/zh-CN.pak'
+  ]);
   forbidEntries(names, [/^data\//, /(^|\/)_test\//]);
 
   for (const required of [PRODUCT, `${PRODUCT}.sh`, 'chrome-sandbox']) {
diff --git a/package.json b/package.json
index 3397a38..6ee26ee 100644
--- a/package.json
+++ b/package.json
@@ -42,6 +42,7 @@
     "files": [
       "main.js",
       "preload.js",
+      "manga-online-preload.js",
       "src/**/*",
       "icons/dist/*.ico",
       "icons/dist/dark/icon-32.png",
diff --git a/src/_test/electron/startup.integration.js b/src/_test/electron/startup.integration.js
index f086940..404489f 100644
--- a/src/_test/electron/startup.integration.js
+++ b/src/_test/electron/startup.integration.js
@@ -51,14 +51,14 @@ app.whenReady().then(async () => {
   const mangaDex = require(path.join(ROOT, 'src', 'sources', 'mangadex'));
   mangaDex.chapters = async () => ({
     items: [
-      { chapterId: 'online-c1', label: '在线第 1 话', pages: 1 },
-      { chapterId: 'online-c2', label: '在线第 2 话', pages: 1 }
+      { chapterId: 'online-c1', label: '在线第 1 话', pages: 8 },
+      { chapterId: 'online-c2', label: '在线第 2 话', pages: 8 }
     ],
     page: 1,
     maxPage: 1
   });
   mangaDex.chapterImageUrls = async () => ({
-    urls: [imageUrl],
+    urls: Array(8).fill(imageUrl),
     mustReport: false,
     quality: 'dataSaver'
   });
@@ -125,6 +125,7 @@ app.whenReady().then(async () => {
     mangaId: 'online-manga',
     title: '在线阅读夹具',
     authors: ['测试作者'],
+    initialChapterId: 'online-c2',
     language: 'zh',
     quality: 'dataSaver'
   })`);
@@ -137,30 +138,37 @@ app.whenReady().then(async () => {
   try {
     firstChapter = await waitUntil(() => onlineWindow.webContents.executeJavaScript(
       `document.querySelectorAll('.chapter-item').length === 2
-        && document.querySelector('.manga-page img')
-        && document.querySelector('.manga-page img').naturalWidth > 0`
+        && document.getElementById('chapterTitle').textContent === '在线第 2 话'
+        && Array.from(document.querySelectorAll('.manga-page img'))
+          .filter((image) => image.naturalWidth > 0).length >= 4`
     ));
   } catch (error) { /* 由下面的诊断状态报告 */ }
   const onlineState = await onlineWindow.webContents.executeJavaScript(`(() => ({
     status: document.getElementById('readerStatus').textContent,
     statusHidden: document.getElementById('readerStatus').classList.contains('hidden'),
+    chapterTitle: document.getElementById('chapterTitle').textContent,
     chapters: document.querySelectorAll('.chapter-item').length,
     pages: document.querySelectorAll('.manga-page').length,
+    scrollTop: document.getElementById('pageScroller').scrollTop,
     pageState: document.querySelector('.manga-page')?.dataset.state || '',
     pageText: document.querySelector('.manga-page')?.dataset.placeholder || ''
   }))()`);
   check('在线阅读器读取整部章节目录并通过主进程显示图片',
     !!firstChapter, JSON.stringify(onlineState));
-  let secondChapter = false;
+  check('章节阅读入口会直接打开指定章节',
+    firstChapter && onlineState.chapterTitle === '在线第 2 话', JSON.stringify(onlineState));
+  check('漫画长图异步展开时停留在章节第一页',
+    firstChapter && onlineState.scrollTop === 0, JSON.stringify(onlineState));
+  let previousChapter = false;
   if (firstChapter) {
-    await onlineWindow.webContents.executeJavaScript(`document.getElementById('nextChapterBtn').click()`);
-    secondChapter = await waitUntil(() => onlineWindow.webContents.executeJavaScript(`(() => {
+    await onlineWindow.webContents.executeJavaScript(`document.getElementById('prevChapterBtn').click()`);
+    previousChapter = await waitUntil(() => onlineWindow.webContents.executeJavaScript(`(() => {
       const image = document.querySelector('.manga-page img');
-      return document.getElementById('chapterTitle').textContent === '在线第 2 话'
+      return document.getElementById('chapterTitle').textContent === '在线第 1 话'
         && image && image.naturalWidth > 0;
     })()`));
   }
-  check('在线阅读器可连续切换到下一章', secondChapter);
+  check('在线阅读器可连续切换到上一章', previousChapter);
   const afterOnline = await win.webContents.executeJavaScript(
     `window.api.library.list().then((result) => result.data.length)`
   );
diff --git a/src/_test/main.test.js b/src/_test/main.test.js
index f355ba4..b4c1dfb 100644
--- a/src/_test/main.test.js
+++ b/src/_test/main.test.js
@@ -368,6 +368,25 @@ test('标准构建入口固定输出目录并保留便携数据', () => {
   assert.doesNotMatch(build, /\$\{PRODUCT\}-\$\{pkg\.version\}/);
 });
 
+test('所有构建与发布入口都包含在线漫画 preload', () => {
+  const root = path.join(__dirname, '..', '..');
+  const pkg = JSON.parse(fs.readFileSync(path.join(root, 'package.json'), 'utf8'));
+  const portable = fs.readFileSync(path.join(root, 'build-portable.js'), 'utf8');
+  const mac = fs.readFileSync(path.join(root, 'build-mac.js'), 'utf8');
+  const linux = fs.readFileSync(path.join(root, 'build-linux.js'), 'utf8');
+  const release = fs.readFileSync(path.join(root, 'build-release.js'), 'utf8');
+
+  assert.ok(pkg.build.files.includes('manga-online-preload.js'));
+  for (const [name, source] of [['Windows', portable], ['macOS', mac], ['Linux', linux]]) {
+    assert.match(source, /manga-online-preload\.js/, `${name} 构建漏掉在线漫画 preload`);
+  }
+  assert.strictEqual(
+    (release.match(/resources\/app\/manga-online-preload\.js/g) || []).length,
+    2,
+    'Windows 与 Linux 发布件回读都必须检查在线漫画 preload'
+  );
+});
+
 function loadPathResolvers(platform, isPackaged) {
   return h.extractFns(
     mainFile,
diff --git a/src/_test/manga-online.test.js b/src/_test/manga-online.test.js
index 1444587..91b2a65 100644
--- a/src/_test/manga-online.test.js
+++ b/src/_test/manga-online.test.js
@@ -36,10 +36,12 @@ test('在线漫画会话与窗口 sender 绑定，并只授权目录里可用的
   const created = sessions.create(11, source(), {
     mangaId: 'manga-1',
     title: '在线漫画',
+    initialChapterId: 'c1',
     language: 'zh-hk',
     quality: 'data'
   });
   assert.strictEqual(created.title, '在线漫画');
+  assert.strictEqual(created.initialChapterId, 'c1');
   assert.strictEqual(created.quality, 'data');
   await assert.rejects(
     Promise.resolve().then(() => sessions.meta(12, created.sessionId)),
diff --git a/src/_test/ui.test.js b/src/_test/ui.test.js
index 8520d7d..9c641c3 100644
--- a/src/_test/ui.test.js
+++ b/src/_test/ui.test.js
@@ -272,11 +272,14 @@ test('漫画源按分类显示，MangaDex 可筛选中文章节并设置图片
 test('漫画详情提供不入库的整部在线阅读器，并通过独立 preload 懒加载图片', () => {
   const html = fs.readFileSync(path.join(__dirname, '..', 'ui', 'manga-online.html'), 'utf8');
   const script = fs.readFileSync(path.join(__dirname, '..', 'ui', 'manga-online.js'), 'utf8');
+  const mangaCss = fs.readFileSync(path.join(__dirname, '..', 'ui', 'manga-online.css'), 'utf8');
   const browse = fs.readFileSync(path.join(__dirname, '..', 'ui', 'views', 'browse.js'), 'utf8');
   const preload = fs.readFileSync(path.join(__dirname, '..', '..', 'manga-online-preload.js'), 'utf8');
 
   assert.match(browse, /id="onlineReadBtn">在线阅读整部漫画/);
   assert.match(browse, /window\.api\.sources\.readOnline\(state\.activeSourceId/);
+  assert.match(browse, /data-chapter-read=/);
+  assert.match(browse, /initialChapterId: chapter && chapter\.chapterId/);
   assert.doesNotMatch(browse.slice(browse.indexOf('async function readOnline'), browse.indexOf('async function loadChapters')), /library\.add/);
   assert.match(html, /Content-Security-Policy" content="default-src 'self'; img-src 'self' blob: data:/);
   assert.match(html, /id="chapterList"/);
@@ -284,6 +287,8 @@ test('漫画详情提供不入库的整部在线阅读器，并通过独立 prel
   assert.match(script, /new IntersectionObserver/);
   assert.match(script, /URL\.createObjectURL\(new Blob/);
   assert.match(script, /ensureNextChapter/);
+  assert.match(script, /state\.meta\.initialChapterId/);
+  assert.match(mangaCss, /\.page-scroller\s*\{[^}]*overflow-anchor:\s*none/);
   assert.match(preload, /mangaOnline:image/);
   assert.doesNotMatch(preload, /library:|reader:bytes|shell:openPath/);
 });
diff --git a/src/manga-online/session.js b/src/manga-online/session.js
index 0f184fd..c98464d 100644
--- a/src/manga-online/session.js
+++ b/src/manga-online/session.js
@@ -37,6 +37,7 @@ function create(ownerId, source, input) {
       .map((author) => cleanText(author, 120))
       .filter(Boolean)
       .slice(0, 20),
+    initialChapterId: cleanText(input && input.initialChapterId, 500),
     language,
     quality,
     chapterPages: new Map(),
@@ -64,6 +65,7 @@ function metaOf(session) {
     title: session.title,
     cover: session.cover,
     authors: session.authors.slice(),
+    initialChapterId: session.initialChapterId,
     language: session.language,
     quality: session.quality
   };
diff --git a/src/ui/manga-online.css b/src/ui/manga-online.css
index a1d7ddb..70089c0 100644
--- a/src/ui/manga-online.css
+++ b/src/ui/manga-online.css
@@ -206,6 +206,7 @@ button, input { font: inherit; }
   min-width: 0;
   flex: 1;
   overflow: auto;
+  overflow-anchor: none;
   overscroll-behavior: contain;
   background: var(--bg);
 }
diff --git a/src/ui/manga-online.js b/src/ui/manga-online.js
index c8d807c..dae182c 100644
--- a/src/ui/manga-online.js
+++ b/src/ui/manga-online.js
@@ -281,7 +281,16 @@ async function init() {
     setStatus('该漫画暂无可在线阅读的章节', true);
     return;
   }
-  openChapter(0);
+  let initialIndex = state.meta.initialChapterId
+    ? state.chapters.findIndex((chapter) => chapter.chapterId === state.meta.initialChapterId)
+    : 0;
+  while (initialIndex < 0 && state.chapterPage < state.chapterMaxPage) {
+    if (!await loadChapterPage(state.chapterPage + 1)) return;
+    initialIndex = state.chapters.findIndex(
+      (chapter) => chapter.chapterId === state.meta.initialChapterId
+    );
+  }
+  openChapter(initialIndex < 0 ? 0 : initialIndex);
 }
 
 $('tocToggleBtn').addEventListener('click', () => $('tocPane').classList.toggle('collapsed'));
diff --git a/src/ui/views/browse.js b/src/ui/views/browse.js
index 839235b..1d5610a 100644
--- a/src/ui/views/browse.js
+++ b/src/ui/views/browse.js
@@ -399,7 +399,7 @@ const Browse = (() => {
 
     $('addLibBtn').onclick = addToLibrary;
     const onlineReadBtn = $('onlineReadBtn');
-    if (onlineReadBtn) onlineReadBtn.onclick = readOnline;
+    if (onlineReadBtn) onlineReadBtn.onclick = () => readOnline();
     const urlLink = $('detailUrlLink');
     if (urlLink) urlLink.onclick = (e) => { e.preventDefault(); window.api.openExternal(d.url); };
     if (chapterBased) {
@@ -416,9 +416,10 @@ const Browse = (() => {
     }
   }
 
-  async function readOnline() {
-    const button = $('onlineReadBtn');
+  async function readOnline(chapter, chapterButton) {
+    const button = chapterButton || $('onlineReadBtn');
     if (!button || !state.currentDetail) return;
+    const oldText = button.textContent;
     button.disabled = true;
     button.textContent = '正在打开…';
     const [qualitySetting, languageSetting] = await Promise.all([
@@ -436,11 +437,14 @@ const Browse = (() => {
       title: state.currentDetail.title,
       cover: state.currentDetail.cover,
       authors: state.currentDetail.authors,
+      initialChapterId: chapter && chapter.chapterId,
       language,
       quality
     });
     button.disabled = false;
-    button.textContent = result.ok ? '在线阅读器已打开' : '在线阅读整部漫画';
+    button.textContent = result.ok
+      ? (chapter ? '已打开' : '在线阅读器已打开')
+      : oldText;
     button.title = result.ok ? '' : result.error || '在线阅读器打开失败';
   }
 
@@ -464,6 +468,7 @@ const Browse = (() => {
       <div class="dl-file-row" data-chapter-id="${escapeHtml(c.chapterId)}">
         <span class="dl-file-name" title="${escapeHtml(c.label)}">${escapeHtml(c.label)}${hint}</span>
         ${meta ? `<span class="dl-fmt">${escapeHtml(meta)}</span>` : ''}
+        <button class="copy-btn" data-chapter-read="${escapeHtml(c.chapterId)}" ${disabled ? 'disabled' : ''}>阅读</button>
         <button class="dl-btn" data-chapter-dl="${escapeHtml(c.chapterId)}" ${disabled ? 'disabled' : ''}>下载</button>
       </div>`;
   }
@@ -505,6 +510,10 @@ const Browse = (() => {
       return;
     }
     list.innerHTML = items.map(chapterRowHtml).join('');
+    list.querySelectorAll('.copy-btn[data-chapter-read]').forEach((btn) => {
+      const chapter = items.find((c) => c.chapterId === btn.dataset.chapterRead);
+      btn.onclick = () => readOnline(chapter, btn);
+    });
     list.querySelectorAll('.dl-btn[data-chapter-dl]').forEach((btn) => {
       const chapter = items.find((c) => c.chapterId === btn.dataset.chapterDl);
       btn.onclick = () => downloadChapter(btn, chapter);