diff --git a/.gitignore b/.gitignore
index 1ee5a591..5447996f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,4 @@ dist
 node_modules
 TODOs.md
 .idea
+.vscode
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 259751f8..52e56213 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,19 @@
+## [0.12.2](https://github.com/vuejs/vitepress/compare/v0.12.1...v0.12.2) (2021-02-15)
+
+### Bug Fixes
+
+- **theme-default:** avoid ad image distortion on mobile ([4a40e1f](https://github.com/vuejs/vitepress/commit/4a40e1faf477c4e779b78f55ac1604eeb52b2499))
+
+## [0.12.1](https://github.com/vuejs/vitepress/compare/v0.12.0...v0.12.1) (2021-02-15)
+
+### Bug Fixes
+
+- `@` alias for import code snippet being always `undefined` ([#204](https://github.com/vuejs/vitepress/issues/204)) ([2aa8ab2](https://github.com/vuejs/vitepress/commit/2aa8ab26e2fcf87ced27999c0be67798d5b4bb88))
+- `base` option not generating correct multi sidebar ([#231](https://github.com/vuejs/vitepress/issues/231)) ([#234](https://github.com/vuejs/vitepress/issues/234)) ([a613df4](https://github.com/vuejs/vitepress/commit/a613df46e8cd7709dd2ad0f411ff52aa431850b6))
+- ads display causing layout break in mobile view ([#230](https://github.com/vuejs/vitepress/issues/230)) ([7ceaf34](https://github.com/vuejs/vitepress/commit/7ceaf344d20f8a51c0452eed264e07b47d104043))
+- home action link not being reactive ([#195](https://github.com/vuejs/vitepress/issues/195)) ([#212](https://github.com/vuejs/vitepress/issues/212)) ([5678dc3](https://github.com/vuejs/vitepress/commit/5678dc3a255c90309d5d7d9b609f3dc7ec7f9d00))
+- nav home title not having locale based link ([#195](https://github.com/vuejs/vitepress/issues/195)) ([#233](https://github.com/vuejs/vitepress/issues/233)) ([6538c8e](https://github.com/vuejs/vitepress/commit/6538c8e70aac60823fd2374e36cb502420184b44))
+
 # [0.12.0](https://github.com/vuejs/vitepress/compare/v0.11.5...v0.12.0) (2021-02-09)
 
 ### Bug Fixes
diff --git a/package.json b/package.json
index cc3d6b67..4bf35b41 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "vitepress",
-  "version": "0.12.0",
+  "version": "0.12.2",
   "description": "Vite & Vue powered static site generator",
   "main": "dist/node/index.js",
   "typings": "types/index.d.ts",
@@ -87,8 +87,7 @@
     "polka": "^0.5.2",
     "prismjs": "^1.23.0",
     "sirv": "^1.0.11",
-    "slash": "^3.0.0",
-    "vite": "2.0.0-beta.50",
+    "vite": "^2.0.0-beta.70",
     "vue": "^3.0.5"
   },
   "devDependencies": {
@@ -113,7 +112,7 @@
     "rollup": "^2.38.5",
     "semver": "^7.3.2",
     "ts-jest": "^26.5.1",
-    "typescript": "^4.1.3",
+    "typescript": "^4.1.4",
     "yorkie": "^2.0.0"
   }
 }
diff --git a/src/client/theme-default/Layout.vue b/src/client/theme-default/Layout.vue
index ed7d02fc..865abfcb 100644
--- a/src/client/theme-default/Layout.vue
+++ b/src/client/theme-default/Layout.vue
@@ -135,7 +135,9 @@ const showSidebar = computed(() => {
 
   const { themeConfig } = siteRouteData.value
 
-  return !isSideBarEmpty(getSideBarConfig(themeConfig.sidebar, route.path))
+  return !isSideBarEmpty(
+    getSideBarConfig(themeConfig.sidebar, route.data.relativePath)
+  )
 })
 
 const toggleSidebar = (to?: boolean) => {
diff --git a/src/client/theme-default/components/CarbonAds.vue b/src/client/theme-default/components/CarbonAds.vue
index 719b43be..bc4f97b2 100644
--- a/src/client/theme-default/components/CarbonAds.vue
+++ b/src/client/theme-default/components/CarbonAds.vue
@@ -59,7 +59,7 @@ onMounted(() => {
 .carbon-ads :deep(.carbon-img) {
   float: left;
   margin-right: 0.75rem;
-  max-width: 100px;
+  max-width: 110px;
   border: 1px solid var(--c-divider);
 }
 
@@ -75,6 +75,7 @@ onMounted(() => {
 .carbon-ads :deep(.carbon-img img) {
   display: block;
   width: 100%;
+  height: auto;
 }
 
 @media (min-width: 420px) {
diff --git a/src/client/theme-default/components/NavBarTitle.vue b/src/client/theme-default/components/NavBarTitle.vue
index 2b4256a7..0eb888dd 100644
--- a/src/client/theme-default/components/NavBarTitle.vue
+++ b/src/client/theme-default/components/NavBarTitle.vue
@@ -1,8 +1,8 @@
 <template>
   <a
     class="nav-bar-title"
-    :href="$site.base"
-    :aria-label="`${$site.title}, back to home`"
+    :href="$withBase($localePath)"
+    :aria-label="`${$siteByRoute.title}, back to home`"
   >
     <img
       v-if="$themeConfig.logo"
diff --git a/src/client/theme-default/components/NavDropdownLinkItem.vue b/src/client/theme-default/components/NavDropdownLinkItem.vue
index 39a31c7b..87723bbb 100644
--- a/src/client/theme-default/components/NavDropdownLinkItem.vue
+++ b/src/client/theme-default/components/NavDropdownLinkItem.vue
@@ -9,16 +9,18 @@
 </template>
 
 <script setup lang="ts">
-import { defineProps } from 'vue'
+import { defineProps, toRefs } from 'vue'
 import type { DefaultTheme } from '../config'
 import { useNavLink } from '../composables/navLink'
 import OutboundLink from './icons/OutboundLink.vue'
 
-const { item } = defineProps<{
+const props = defineProps<{
   item: DefaultTheme.NavItemWithLink
 }>()
 
-const { props: linkProps, isExternal } = useNavLink(item)
+const propsRefs = toRefs(props)
+
+const { props: linkProps, isExternal } = useNavLink(propsRefs.item)
 </script>
 
 <style scoped>
diff --git a/src/client/theme-default/components/NavLink.vue b/src/client/theme-default/components/NavLink.vue
index 41d848f4..1e8d59cf 100644
--- a/src/client/theme-default/components/NavLink.vue
+++ b/src/client/theme-default/components/NavLink.vue
@@ -7,16 +7,18 @@
 </template>
 
 <script setup lang="ts">
-import { defineProps } from 'vue'
+import { defineProps, toRefs } from 'vue'
 import type { DefaultTheme } from '../config'
 import { useNavLink } from '../composables/navLink'
 import OutboundLink from './icons/OutboundLink.vue'
 
-const { item } = defineProps<{
-  item: DefaultTheme.NavItemWithLink
+const props = defineProps<{
+  item: DefaultTheme.NavItemWithLink,
 }>()
 
-const { props: linkProps, isExternal } = useNavLink(item)
+const propsRefs = toRefs(props)
+
+const { props: linkProps, isExternal } = useNavLink(propsRefs.item)
 </script>
 
 <style scoped>
diff --git a/src/client/theme-default/components/SideBarLink.ts b/src/client/theme-default/components/SideBarLink.ts
index a0c987c4..b5b903b3 100644
--- a/src/client/theme-default/components/SideBarLink.ts
+++ b/src/client/theme-default/components/SideBarLink.ts
@@ -18,7 +18,7 @@ export const SideBarLink: FunctionalComponent<{
   const text = props.item.text
   const link = resolveLink(site.value.base, props.item.link)
   const children = (props.item as DefaultTheme.SideBarGroup).children
-  const active = isActive(route, link)
+  const active = isActive(route, props.item.link)
   const childItems = createChildren(active, children, headers)
 
   return h('li', { class: 'sidebar-link' }, [
diff --git a/src/client/theme-default/composables/navLink.ts b/src/client/theme-default/composables/navLink.ts
index c9f4d7ac..c726b931 100644
--- a/src/client/theme-default/composables/navLink.ts
+++ b/src/client/theme-default/composables/navLink.ts
@@ -1,23 +1,23 @@
-import { computed } from 'vue'
+import { computed, Ref } from 'vue'
 import { useRoute } from 'vitepress'
 import type { DefaultTheme } from '../config'
 import { isExternal as isExternalCheck } from '../utils'
 import { useUrl } from '../composables/url'
 
-export function useNavLink(item: DefaultTheme.NavItemWithLink) {
+export function useNavLink(item: Ref<DefaultTheme.NavItemWithLink>) {
   const route = useRoute()
   const { withBase } = useUrl()
 
-  const isExternal = isExternalCheck(item.link)
+  const isExternal = isExternalCheck(item.value.link)
 
   const props = computed(() => {
-    const routePath = normalizePath(route.path)
+    const routePath = normalizePath(`/${route.data.relativePath}`)
 
     let active = false
-    if (item.activeMatch) {
-      active = new RegExp(item.activeMatch).test(routePath)
+    if (item.value.activeMatch) {
+      active = new RegExp(item.value.activeMatch).test(routePath)
     } else {
-      const itemPath = normalizePath(withBase(item.link))
+      const itemPath = normalizePath(withBase(item.value.link))
       active =
         itemPath === '/'
           ? itemPath === routePath
@@ -29,10 +29,10 @@ export function useNavLink(item: DefaultTheme.NavItemWithLink) {
         active,
         isExternal
       },
-      href: isExternal ? item.link : withBase(item.link),
-      target: item.target || isExternal ? `_blank` : null,
-      rel: item.rel || isExternal ? `noopener noreferrer` : null,
-      'aria-label': item.ariaLabel
+      href: isExternal ? item.value.link : withBase(item.value.link),
+      target: item.value.target || isExternal ? `_blank` : null,
+      rel: item.value.rel || isExternal ? `noopener noreferrer` : null,
+      'aria-label': item.value.ariaLabel
     }
   })
 
diff --git a/src/client/theme-default/composables/sideBar.ts b/src/client/theme-default/composables/sideBar.ts
index e9b53feb..2dc723ae 100644
--- a/src/client/theme-default/composables/sideBar.ts
+++ b/src/client/theme-default/composables/sideBar.ts
@@ -30,7 +30,7 @@ export function useSideBar() {
     // now, there's no sidebar setting at frontmatter; let's see the configs
     const themeSidebar = getSideBarConfig(
       site.value.themeConfig.sidebar,
-      route.path
+      route.data.relativePath
     )
 
     if (themeSidebar === false) {
diff --git a/src/client/theme-default/utils.ts b/src/client/theme-default/utils.ts
index f86d7d4f..4c6f88de 100644
--- a/src/client/theme-default/utils.ts
+++ b/src/client/theme-default/utils.ts
@@ -22,7 +22,7 @@ export function isActive(route: Route, path?: string): boolean {
     return false
   }
 
-  const routePath = normalize(route.path)
+  const routePath = normalize(`/${route.data.relativePath}`)
   const pagePath = normalize(path)
 
   return routePath === pagePath
diff --git a/src/node/build/bundle.ts b/src/node/build/bundle.ts
index f167ab6a..0142216f 100644
--- a/src/node/build/bundle.ts
+++ b/src/node/build/bundle.ts
@@ -1,6 +1,6 @@
 import ora from 'ora'
 import path from 'path'
-import slash from 'slash'
+import { slash } from '../utils/slash'
 import { APP_PATH } from '../alias'
 import { SiteConfig } from '../config'
 import { RollupOutput } from 'rollup'
diff --git a/src/node/markdown/markdown.ts b/src/node/markdown/markdown.ts
index 55152e30..6270babe 100644
--- a/src/node/markdown/markdown.ts
+++ b/src/node/markdown/markdown.ts
@@ -42,6 +42,7 @@ export interface MarkdownRenderer {
 }
 
 export const createMarkdownRenderer = (
+  root: string,
   options: MarkdownOptions = {}
 ): MarkdownRenderer => {
   const md = MarkdownIt({
@@ -55,7 +56,7 @@ export const createMarkdownRenderer = (
   md.use(componentPlugin)
     .use(highlightLinePlugin)
     .use(preWrapperPlugin)
-    .use(snippetPlugin)
+    .use(snippetPlugin, root)
     .use(hoistPlugin)
     .use(containerPlugin)
     .use(extractHeaderPlugin)
diff --git a/src/node/markdownToVue.ts b/src/node/markdownToVue.ts
index c5ba22a6..dc6aeb02 100644
--- a/src/node/markdownToVue.ts
+++ b/src/node/markdownToVue.ts
@@ -5,7 +5,8 @@ import LRUCache from 'lru-cache'
 import { createMarkdownRenderer, MarkdownOptions } from './markdown/markdown'
 import { deeplyParseHeader } from './utils/parseHeader'
 import { PageData, HeadConfig } from '../../types/shared'
-import slash from 'slash'
+import { slash } from './utils/slash'
+import chalk from 'chalk'
 
 const debug = require('debug')('vitepress:md')
 const cache = new LRUCache<string, MarkdownCompileResult>({ max: 1024 })
@@ -13,13 +14,16 @@ const cache = new LRUCache<string, MarkdownCompileResult>({ max: 1024 })
 interface MarkdownCompileResult {
   vueSrc: string
   pageData: PageData
+  deadLinks: string[]
 }
 
 export function createMarkdownToVueRenderFn(
   root: string,
-  options: MarkdownOptions = {}
+  options: MarkdownOptions = {},
+  pages: string[]
 ) {
-  const md = createMarkdownRenderer(options)
+  const md = createMarkdownRenderer(root, options)
+  pages = pages.map((p) => slash(p.replace(/\.md$/, '')))
 
   return (src: string, file: string): MarkdownCompileResult => {
     const relativePath = slash(path.relative(root, file))
@@ -40,7 +44,31 @@ export function createMarkdownToVueRenderFn(
       .replace(/import\.meta/g, 'import.<wbr/>meta')
       .replace(/process\.env/g, 'process.<wbr/>env')
 
-    // TODO validate data.links?
+    // validate data.links
+    const deadLinks = []
+    if (data.links) {
+      const dir = path.dirname(file)
+      for (let url of data.links) {
+        url = url.replace(/[?#].*$/, '').replace(/\.(html|md)$/, '')
+        if (url.endsWith('/')) url += `index`
+        const resolved = slash(
+          url.startsWith('/')
+            ? url.slice(1)
+            : path.relative(root, path.resolve(dir, url))
+        )
+        if (!pages.includes(resolved)) {
+          console.warn(
+            chalk.yellow(
+              `\n(!) Found dead link ${chalk.cyan(
+                url
+              )} in file ${chalk.white.dim(file)}`
+            )
+          )
+          deadLinks.push(url)
+        }
+      }
+    }
+
     const pageData: PageData = {
       title: inferTitle(frontmatter, content),
       description: inferDescription(frontmatter),
@@ -59,7 +87,8 @@ export function createMarkdownToVueRenderFn(
 
     const result = {
       vueSrc,
-      pageData
+      pageData,
+      deadLinks
     }
     cache.set(src, result)
     return result
diff --git a/src/node/plugin.ts b/src/node/plugin.ts
index a89c9d87..dbbff709 100644
--- a/src/node/plugin.ts
+++ b/src/node/plugin.ts
@@ -4,7 +4,7 @@ import { SiteConfig, resolveSiteData } from './config'
 import { createMarkdownToVueRenderFn } from './markdownToVue'
 import { APP_PATH, SITE_DATA_REQUEST_PATH } from './alias'
 import createVuePlugin from '@vitejs/plugin-vue'
-import slash from 'slash'
+import { slash } from './utils/slash'
 import { OutputAsset, OutputChunk } from 'rollup'
 
 const hashRE = /\.(\w+)\.js$/
@@ -24,11 +24,11 @@ const isPageChunk = (
 
 export function createVitePressPlugin(
   root: string,
-  { configPath, alias, markdown, site, vueOptions }: SiteConfig,
+  { configPath, alias, markdown, site, vueOptions, pages }: SiteConfig,
   ssr = false,
   pageToHashMap?: Record<string, string>
 ): Plugin[] {
-  const markdownToVue = createMarkdownToVueRenderFn(root, markdown)
+  const markdownToVue = createMarkdownToVueRenderFn(root, markdown, pages)
 
   const vuePlugin = createVuePlugin({
     include: [/\.vue$/, /\.md$/],
@@ -36,13 +36,16 @@ export function createVitePressPlugin(
   })
 
   let siteData = site
+  let hasDeadLinks = false
 
   const vitePressPlugin: Plugin = {
     name: 'vitepress',
 
     config() {
       return {
-        alias,
+        resolve: {
+          alias
+        },
         define: {
           __CARBON__: !!site.themeConfig.carbonAds?.carbon,
           __BSA__: !!site.themeConfig.carbonAds?.custom,
@@ -69,7 +72,17 @@ export function createVitePressPlugin(
     transform(code, id) {
       if (id.endsWith('.md')) {
         // transform .md files into vueSrc so plugin-vue can handle it
-        return markdownToVue(code, id).vueSrc
+        const { vueSrc, deadLinks } = markdownToVue(code, id)
+        if (deadLinks.length) {
+          hasDeadLinks = true
+        }
+        return vueSrc
+      }
+    },
+
+    renderStart() {
+      if (hasDeadLinks) {
+        throw new Error(`One or more pages contain dead links.`)
       }
     },
 
diff --git a/src/node/utils/slash.ts b/src/node/utils/slash.ts
new file mode 100644
index 00000000..f06ed939
--- /dev/null
+++ b/src/node/utils/slash.ts
@@ -0,0 +1,3 @@
+export function slash(p: string): string {
+  return p.replace(/\\/g, '/')
+}
diff --git a/yarn.lock b/yarn.lock
index cbd0be7c..4cc35a04 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2586,11 +2586,6 @@ fsevents@^2.1.2:
   resolved "https://registry.yarnpkg.com/fsevents/-/fsevents-2.2.1.tgz#1fb02ded2036a8ac288d507a65962bd87b97628d"
   integrity sha512-bTLYHSeC0UH/EFXS9KqWnXuOl/wHK5Z/d+ghd5AsFMYN7wIGkUCOJyzy88+wJKkZPGON8u4Z9f6U4FdgURE9qA==
 
-fsevents@~2.1.2:
-  version "2.1.3"
-  resolved "https://registry.yarnpkg.com/fsevents/-/fsevents-2.1.3.tgz#fb738703ae8d2f9fe900c33836ddebee8b97f23e"
-  integrity sha512-Auw9a4AxqWpa9GUfj370BMPzzyncfBABW8Mab7BGWBYDj4Isgq+cDKtx0i6u9jcX9pQDnswsaaOTgTmA5pEjuQ==
-
 fsevents@~2.3.1:
   version "2.3.1"
   resolved "https://registry.yarnpkg.com/fsevents/-/fsevents-2.3.1.tgz#b209ab14c61012636c8863507edf7fb68cc54e9f"
@@ -5222,13 +5217,6 @@ rimraf@^3.0.0, rimraf@^3.0.2:
   dependencies:
     glob "^7.1.3"
 
-rollup@^2.35.1:
-  version "2.35.1"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-2.35.1.tgz#e6bc8d10893556a638066f89e8c97f422d03968c"
-  integrity sha512-q5KxEyWpprAIcainhVy6HfRttD9kutQpHbeqDTWnqAFNJotiojetK6uqmcydNMymBEtC4I8bCYR+J3mTMqeaUA==
-  optionalDependencies:
-    fsevents "~2.1.2"
-
 rollup@^2.38.5:
   version "2.38.5"
   resolved "https://registry.yarnpkg.com/rollup/-/rollup-2.38.5.tgz#be41ad4fe0c103a8794377afceb5f22b8f603d6a"
@@ -5996,10 +5984,10 @@ typedarray-to-buffer@^3.1.5:
   dependencies:
     is-typedarray "^1.0.0"
 
-typescript@^4.1.3:
-  version "4.1.3"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.1.3.tgz#519d582bd94cba0cf8934c7d8e8467e473f53bb7"
-  integrity sha512-B3ZIOf1IKeH2ixgHhj6la6xdwR9QrLC5d1VKeCSY4tvkqhF2eqd9O7txNlS0PO3GrBAFIdr3L1ndNwteUbZLYg==
+typescript@^4.1.4:
+  version "4.1.4"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.1.4.tgz#f058636e2f4f83f94ddaae07b20fd5e14598432f"
+  integrity sha512-+Uru0t8qIRgjuCpiSPpfGuhHecMllk5Zsazj5LZvVsEStEjmIRRBZe+jHjGQvsgS7M1wONy2PQXd67EMyV6acg==
 
 uc.micro@^1.0.1, uc.micro@^1.0.5:
   version "1.0.6"
@@ -6102,17 +6090,17 @@ verror@1.10.0:
     core-util-is "1.0.2"
     extsprintf "^1.2.0"
 
-vite@2.0.0-beta.50:
-  version "2.0.0-beta.50"
-  resolved "https://registry.yarnpkg.com/vite/-/vite-2.0.0-beta.50.tgz#04e66d009470ca90ab8a4a43687e899b670a0f25"
-  integrity sha512-zzMgrWJK92/aQ1rxvc+0QKeOCdOP4m2EPGwK2HKhlifQVnSdpYQzQkWLzaGh1GQAp61W+Su8cu6cWINpFgNrfQ==
+vite@^2.0.0-beta.70:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/vite/-/vite-2.0.0.tgz#156f35eadaa7947629aa8a24eb23129b07116ee3"
+  integrity sha512-rNli5g0DaQ6+btlRqkmaR06neWaJGApmt40gocqrYDNi2XoEXYQgKiHSWzMeUgc1Cdva2HduqazaE+RaKjBpdQ==
   dependencies:
     esbuild "^0.8.34"
     postcss "^8.2.1"
     resolve "^1.19.0"
-    rollup "^2.35.1"
+    rollup "^2.38.5"
   optionalDependencies:
-    fsevents "~2.1.2"
+    fsevents "~2.3.1"
 
 vue@^3.0.5:
   version "3.0.5"