diff --git a/js/kunai.js b/js/kunai.js
index a9d08eb..d6f7bfd 100644
--- a/js/kunai.js
+++ b/js/kunai.js
@@ -30,6 +30,7 @@ class Kunai {
       }))
     )
 
+
     try {
       this.log.disableBacktrace(true)
       this.log.info(`version ${KUNAI_PACKAGE.version} (https://github.com/cpprefjp/kunai/tree/v${KUNAI_PACKAGE.version})`)
@@ -38,16 +39,13 @@ class Kunai {
       this.log.disableBacktrace(false)
     }
 
-    if (this.opts.compat) {
-      this.compat = new Compat(this.log)
-    }
-
     this.ui = {
       navbar: null,
       sidebar: null,
       content: null,
     }
     this.initUI()
+    this.getSidebar = this.initSidebar()
 
     this.wand = new Wand(this.log)
 
@@ -56,15 +54,21 @@ class Kunai {
 
   async cpprefjp() {
     this.load_impl(['cpprefjp', 'site'])
-    this.crs = await this.initCRSearch(true)
+    this.afterCR = this.initCRSearch(true)
+    this.crs = await this.afterCR
   }
 
   async boostjp() {
     this.load_impl(['boostjp', 'site'])
-    this.crs = await this.initCRSearch(false)
+    this.afterCR = this.initCRSearch(false)
+    this.crs = await this.afterCR
   }
 
-  load_impl(config) {
+  async load_impl(config) {
+    if (this.opts.compat) {
+      this.compat = new Compat(this.log, config)
+    }
+
     const desc = config.join('/')
     this.log.info(`loading (${desc})`)
     $('body').addClass('kunai')
@@ -114,13 +118,18 @@ class Kunai {
     this.ui.content = new UI.Content(l)
   }
 
-  async initCRSearch(isEnabled, onDatabase) {
+  async onDatabase(db) {
+    await this.ui.sidebar.onDatabase(db)
+    await this.ui.sidebar.treeview.onPageID(this.meta.page_id)
+  }
+
+  async initCRSearch(isEnabled) {
     if (!isEnabled) return null
 
-    await this.initSidebar()
+    await this.getSidebar
 
     let crs = new CRSearch({
-      onDatabase: ::this.ui.sidebar.onDatabase,
+      onDatabase: ::this.onDatabase,
     })
     crs.database('https://cpprefjp.github.io/static/crsearch/crsearch.json')
 
diff --git a/js/kunai/compat.js b/js/kunai/compat.js
index 1a26fac..2872d99 100644
--- a/js/kunai/compat.js
+++ b/js/kunai/compat.js
@@ -1,6 +1,7 @@
 class Compat {
-  constructor(log) {
+  constructor(log, repo) {
     this.log = log.makeContext('Compat')
+    this.repo = [].concat(repo)
 
     this.log.info('applying...')
 
@@ -27,6 +28,8 @@ class Compat {
       }
     }
 
+    // $('#navbar-collapse ul.nav > li:nth-child(2) > a').text(repo.join('/'))
+
     this.log.info('applied.')
   } // constructor
 
diff --git a/js/kunai/meta/meta.js b/js/kunai/meta/meta.js
index 8e94380..4d3f0b8 100644
--- a/js/kunai/meta/meta.js
+++ b/js/kunai/meta/meta.js
@@ -6,6 +6,8 @@ import * as Code from '../code'
 
 import {Logger} from 'nagato'
 
+import URL from 'url-parse'
+
 
 let Marked = require('marked')
 const MarkedOpts = {
@@ -56,6 +58,12 @@ class Meta {
     this.log.info(`original_url: ${this.original_url}`, this.original_url)
     this.filename = [...this.original_url.pathname.split('/')].pop()
 
+    {
+      let ids = this.original_url.pathname.split('/').slice(5)
+      ids[ids.length - 1] = ids[ids.length - 1].replace(/\.md$/, '')
+      this.page_id = ids
+    }
+
     this.raw_url = new URL(this.original_url)
     this.raw_url.host = 'raw.githubusercontent.com'
     this.raw_url.pathname = this.raw_url.pathname.replace(
diff --git a/js/kunai/ui/sidebar.js b/js/kunai/ui/sidebar.js
index 68d4b86..af42dcc 100644
--- a/js/kunai/ui/sidebar.js
+++ b/js/kunai/ui/sidebar.js
@@ -33,38 +33,24 @@ class Sidebar {
       this.e.addClass('legacy')
     }
 
-    this.initComponents()
+    this.getTreeview = this.initTreeview()
   }
 
   async onDatabase(db) {
     try {
       this.log.info(`onDatabase`, db)
 
-      this.tree = db.getTree(this.kc)
-
-      // workaround name
-      for (let t of this.tree) {
-        if (t.root) {
-          const name = t.root.id.join()
-          const real_name = t.category.name
-          if (name !== real_name) {
-            this.log.warn(`got incorrect title '${name}'; expected = '${real_name}'. ignoring...`)
-          }
-        }
-      }
+      this.db = db
 
-      this.treeView.onData(this.tree)
+      let t = await this.getTreeview
+      await t.onData(db)
 
     } finally {
       this.e.removeClass('loading')
     }
   }
 
-  async initComponents() {
-    await this.initDynamicComponents()
-  }
-
-  async initDynamicComponents() {
+  async initTreeview() {
     let e = null
 
     if (this.legacy) {
@@ -73,7 +59,7 @@ class Sidebar {
       e = $('<div>').addClass('kunai-tree').addClass('v2').appendTo(this.e)
     }
 
-    this.treeView = new Treeview(
+    this.treeview = new Treeview(
       this.log,
       this.kc,
       this.e,
@@ -81,6 +67,7 @@ class Sidebar {
         legacy: this.legacy
       }
     )
+    return this.treeview
   }
 }
 
diff --git a/js/kunai/ui/treeview.js b/js/kunai/ui/treeview.js
index f69dcb0..db9e3fc 100644
--- a/js/kunai/ui/treeview.js
+++ b/js/kunai/ui/treeview.js
@@ -24,6 +24,8 @@ class DOM {
 
     this.lastBranchID = 0
     this.branchPrevs = new Map
+
+    this.expandElems = new WeakMap
   }
 
   static scrollEps = 8
@@ -82,22 +84,23 @@ class DOM {
     }
   }
 
-  async createContent(e, elem, obj) {
-    // this.log.debug(`createContent '${obj.self.id}'`, e, elem, obj)
+  async createContent(obj) {
+    this.log.debug(`createContent '${obj.self.id}'`, obj)
 
     switch (obj.self.id.type) {
       case IType.header:
-        return await this.createHeaderContent(e, elem, obj)
+        return await this.createHeaderContent(obj)
 
       default:
-        this.log.error('createContent', e, elem, obj)
+        this.log.error('createContent', obj)
         throw new Error(`unhandled index type in createContent`)
     }
   }
 
-  async createHeaderContent(e, elem, h) {
+  async createHeaderContent(h) {
     // this.log.debug(`createHeaderContent (${h.self.id.join()})`, e, elem, h)
     let empty = true
+    let elem = this.expandElems.get(h.self.id)
 
     if (h.classes && h.classes.length) {
       empty = false
@@ -126,10 +129,23 @@ class DOM {
     return true // this.lazyLoaders.get(h.self.id)
   }
 
-  async doExpand(id, e) {
-    // this.log.debug(`doExpand '${id.join()}'`, id, e)
-    await this.lazyLoaders.get(id)(e)
-    $(e.target).closest('li').toggleClass('expanded')
+  async doExpand(id) {
+    // this.log.debug(`doExpand '${id.join()}'`, id)
+    await this.lazyLoaders.get(id)()
+    this.expandElems.get(id).toggleClass('expanded')
+  }
+
+  async scrollAt(id) {
+    this.log.debug(`scrollAt '${id.join()}'`, id)
+
+    const e = this.expandElems.get(id)
+
+    let broot = e.closest('.kunai-branch')
+    // this.log.debug(`branch root`, broot)
+
+    broot.animate({
+      scrollTop: e.offset().top
+    }, 1)
   }
 
   async kunaiBranch(me, branchFor, scrollHandler) {
@@ -226,18 +242,18 @@ class DOM {
   }
 
   async makeExpandable(elem, obj) {
+    // this.log.debug(`makeExpandable '${obj.self.id.join()}'`, elem, obj)
+    this.expandElems.set(obj.self.id, elem)
     this.lazyLoaders.set(
       obj.self.id,
-      async (e) => {
-        return await ::this.createContent(e, elem, obj)
-      }
+      async () => { await this.createContent(obj) }
     )
 
     let bar = $('<div>', {class: 'expandbar'}).appendTo(elem)
 
     bar.append(
-      $('<div>', {class: 'expander'}).on('click', async (e) => {
-        await this.doExpand(obj.self.id, e)
+      $('<div>', {class: 'expander'}).on('click', async () => {
+        await this.doExpand(obj.self.id)
       })
     )
 
@@ -289,37 +305,95 @@ class Treeview {
     }
   }
 
-  async onData(tree) {
-    const runID = JSON.stringify({name: 'onData', timestamp: Date.now()})
-    console.time(runID)
-    try {
-      this.dom = new DOM(this.log, this.kc)
-      await this.onDataImpl(tree)
-    } finally {
-      console.timeEnd(runID)
+  async onPageID(ids) {
+    this.page_id = [].concat(ids)
+
+    this.page_idx_id = null
+    const ns_id = ids.shift()
+
+    for (const type of Object.values(IType)) {
+      const rvid = IndexID.composeReverseID(type, ids)
+      if (this.db.reverseID.has(rvid)) {
+        this.page_idx_id = this.db.reverseID.get(rvid)
+      }
     }
-  }
 
-  async onDataImpl(tree) {
-    this.log.debug('data', tree)
-    let root = $('<ul>', {class: 'root'}).appendTo(this.root)
+    this.page_idx = null
 
-    const cats = this.kc.categories()
+    try {
+      if (!this.page_idx_id) {
+        throw new Error(`IndexID for path '${ids.join('/')}' not present in database`)
+      }
+      if (!IndexID.isClassy(this.page_idx_id.type)) {
+        this.log.info(`current page '${this.page_idx_id.join()}' is not classy. nothing to expand`)
+
+      } else {
+        this.log.info(`classy page '${this.page_idx_id.join()}'`)
 
-    for (const top of tree) {
-      if (top.category.index === cats.get('index').index) {
-        continue
+        for (const ns of this.db.namespaces) {
+          if (ns.namespace[0] !== 'reference') continue
+
+          this.log.debug(`checking Namespace '${ns.pretty_name()}'`, ns)
+          if (ns.indexes.has(this.page_idx_id)) {
+            this.page_idx = ns.indexes.get(this.page_idx_id)
+          }
+        }
+
+        if (!this.page_idx) {
+          throw new Error(`Index for '${this.page_idx_id.join()}' not found in any of the 'reference' namespace`)
+        }
+
+        const h = this.page_idx.in_header
+        this.log.info(`expanding current page header '${h.id.join()}'`, h, this.page_idx)
+
+        // await this.dom.doExpand(h.id)
+        await this.dom.doExpand(h.id)
+        await this.dom.scrollAt(h.id)
       }
 
-      let e = $('<li>', {class: 'top', 'data-top-id': top.namespace.namespace[0]}).appendTo(root)
-      e.append(await this.dom.makeTitle(top))
+    } catch (e) {
+      this.log.error(`Failed to determine current page for id '${ids.join('/')}'. Sidebar will NOT work properly! (${e})`, ids)
+    }
+  }
 
-      if (top.category.index === cats.get('lang').index) {
-        this.processLangTop(top, e)
-      } else {
-        this.processTop(top, e)
+  async onData(db) {
+    this.db = db
+    this.tree = db.getTree(this.kc)
+
+    // workaround name
+    for (let t of this.tree) {
+      if (t.root) {
+        const name = t.root.id.join()
+        const real_name = t.category.name
+        if (name !== real_name) {
+          this.log.warn(`got incorrect title '${name}'; expected = '${real_name}'. ignoring...`)
+        }
       }
     }
+
+    this.dom = new DOM(this.log, this.kc)
+    await this.onDataImpl()
+  }
+
+  async onDataImpl() {
+    this.log.debug('data', this.tree)
+    let root = $('<ul>', {class: 'root'}).appendTo(this.root)
+
+    const cats = this.kc.categories()
+
+    root.append(await Promise.all(
+      this.tree.filter((top) => top.category.index !== cats.get('index').index).map(async (top) => {
+        let e = $('<li>', {class: 'top', 'data-top-id': top.namespace.namespace[0]})
+        e.append(await this.dom.makeTitle(top))
+
+        if (top.category.index === cats.get('lang').index) {
+          this.processLangTop(top, e)
+        } else {
+          this.processTop(top, e)
+        }
+        return e
+      })
+    ))
   }
 
   async processTop(top, e) {
diff --git a/js/kunai/wand.js b/js/kunai/wand.js
index 8367b8c..60012e2 100644
--- a/js/kunai/wand.js
+++ b/js/kunai/wand.js
@@ -3,6 +3,8 @@ import {NetworkError} from './error'
 import {default as Numeral} from 'numeral'
 import {Logger} from 'nagato'
 
+import URL from 'url-parse'
+
 
 class APIError extends NetworkError {
   constructor() {
diff --git a/package.json b/package.json
index 0b8f9e5..ef68aec 100644
--- a/package.json
+++ b/package.json
@@ -73,7 +73,7 @@
     "anser": "^1.4.4",
     "babel-runtime": "^6.26.0",
     "codemirror": "^5.31.0",
-    "crsearch": "^2.6.2",
+    "crsearch": "^2.6.4",
     "font-awesome": "^4.7.0",
     "jquery": "^3.2.1",
     "marked": "^0.3.6",