diff --git a/packages/gem-book/src/element/elements/main.ts b/packages/gem-book/src/element/elements/main.ts
index 830d5fee..104e8bd8 100644
--- a/packages/gem-book/src/element/elements/main.ts
+++ b/packages/gem-book/src/element/elements/main.ts
@@ -69,8 +69,27 @@ export class Main extends GemElement {
   // homepage/footer 等内置元素渲染在 main 前面，不能使用自定义渲染器
   static instance?: Main;
 
+  static detailsStateCache = new Map<string, boolean>();
+
   static parseMarkdown(mdBody: string) {
-    return [...parser.parseFromString(parse(mdBody, { renderer: Main.instance?.renderer }), 'text/html').body.children];
+    const elements = [
+      ...parser.parseFromString(
+        parse(mdBody, {
+          renderer: Main.instance?.renderer,
+        }),
+        'text/html',
+      ).body.children,
+    ];
+    elements.forEach((detailsEle) => {
+      if (detailsEle instanceof HTMLDetailsElement) {
+        const html = locationStore.path + detailsEle.innerHTML;
+        detailsEle.open = !!Main.detailsStateCache.get(html);
+        detailsEle.addEventListener('toggle', () => {
+          Main.detailsStateCache.set(html, detailsEle.open);
+        });
+      }
+    });
+    return elements;
   }
 
   static unsafeRenderHTML(s: string, style = '') {
diff --git a/packages/gem-book/src/element/elements/plugin.ts b/packages/gem-book/src/element/elements/plugin.ts
index 1e965928..29ee40d5 100644
--- a/packages/gem-book/src/element/elements/plugin.ts
+++ b/packages/gem-book/src/element/elements/plugin.ts
@@ -57,16 +57,17 @@ export class GemBookPluginElement<T = any> extends GemElement<T> {
     return bookStore.getCurrentLink?.();
   }
 
-  static caches?: Map<string, any>;
+  static caches = new Map<typeof GemBookPluginElement, Map<string, any>>();
 
   cacheState(getDeps: () => string[]) {
     if (!this.state) throw new Error('Only cache state');
     const cons = this.constructor as typeof GemBookPluginElement;
-    const caches = cons.caches || (cons.caches = new Map());
+    const cache = cons.caches.get(cons) || new Map();
+    cons.caches.set(cons, cache);
     this.memo(
       () => {
-        Object.assign(this.state!, caches.get(getDeps().join()));
-        return () => caches.set(getDeps().join(), this.state);
+        Object.assign(this.state!, cache.get(getDeps().join()));
+        return () => cache.set(getDeps().join(), this.state);
       },
       () => getDeps(),
     );
diff --git a/packages/gem-book/src/element/elements/pre.ts b/packages/gem-book/src/element/elements/pre.ts
index caa55478..b378154f 100644
--- a/packages/gem-book/src/element/elements/pre.ts
+++ b/packages/gem-book/src/element/elements/pre.ts
@@ -349,45 +349,57 @@ export class Pre extends GemElement {
     }
   };
 
-  mounted() {
-    this.effect(async () => {
-      if (!this.getBoundingClientRect().width) return;
-      if (this.status === 'hidden') return;
-      if (!this.codeRef.element) return;
-      await import(/* @vite-ignore */ /* webpackIgnore: true */ prismjs);
-      const { Prism } = window as any;
-      if (this.codelang && !Prism.languages[this.codelang]) {
-        const lang = langAliases[this.codelang] || this.codelang;
-        const langDeps = ([] as string[]).concat(langDependencies[lang] || []);
-        try {
-          await Promise.all(
-            langDeps.map((langDep) => {
-              if (!Prism.languages[langDep]) {
-                return import(
-                  /* @vite-ignore */ /* webpackIgnore: true */ `${prismjs}/components/prism-${langDep}.min.js`
-                );
-              }
-            }),
-          );
-          await import(/* @vite-ignore */ /* webpackIgnore: true */ `${prismjs}/components/prism-${lang}.min.js`);
-        } catch {
-          //
-        }
+  #updateHtml = async () => {
+    if (this.status === 'hidden') return;
+    if (!this.codeRef.element) return;
+    await import(/* @vite-ignore */ /* webpackIgnore: true */ prismjs);
+    const { Prism } = window as any;
+    if (this.codelang && !Prism.languages[this.codelang]) {
+      const lang = langAliases[this.codelang] || this.codelang;
+      const langDeps = ([] as string[]).concat(langDependencies[lang] || []);
+      try {
+        await Promise.all(
+          langDeps.map((langDep) => {
+            if (!Prism.languages[langDep]) {
+              return import(
+                /* @vite-ignore */ /* webpackIgnore: true */ `${prismjs}/components/prism-${langDep}.min.js`
+              );
+            }
+          }),
+        );
+        await import(/* @vite-ignore */ /* webpackIgnore: true */ `${prismjs}/components/prism-${lang}.min.js`);
+      } catch {
+        //
       }
-      const content = Prism.languages[this.codelang]
-        ? Prism.highlight(this.textContent || '', Prism.languages[this.codelang], this.codelang)
-        : this.innerHTML;
-      const { parts, lineNumbersParts } = this.#getParts(content);
-      this.codeRef.element.innerHTML = parts.reduce(
-        (p, c, i) =>
-          p +
-          `<span class="code-ignore token comment">  @@ ${lineNumbersParts[i - 1].at(-1)! + 1}-${
-            lineNumbersParts[i].at(0)! - 1
-          } @@</span>` +
-          c,
-      );
-      this.#setOffset();
+    }
+    const content = Prism.languages[this.codelang]
+      ? Prism.highlight(this.textContent || '', Prism.languages[this.codelang], this.codelang)
+      : this.innerHTML;
+    const { parts, lineNumbersParts } = this.#getParts(content);
+    this.codeRef.element.innerHTML = parts.reduce(
+      (p, c, i) =>
+        p +
+        `<span class="code-ignore token comment">  @@ ${lineNumbersParts[i - 1].at(-1)! + 1}-${
+          lineNumbersParts[i].at(0)! - 1
+        } @@</span>` +
+        c,
+    );
+    this.#setOffset();
+  };
+
+  mounted() {
+    const io = new IntersectionObserver((entries) => {
+      entries.forEach(({ intersectionRatio }) => {
+        if (intersectionRatio === 0) return;
+        io.disconnect();
+        this.effect(
+          () => this.#updateHtml(),
+          () => [this.textContent, this.codelang],
+        );
+      });
     });
+    io.observe(this);
+    return () => io.disconnect();
   }
 
   render() {