fix($core): #2627 Dup ID violates HTML5-4 (#2650)

packages/@vuepress/core/lib/client/components/OutboundLink.vue

@@ -1,26 +1,27 @@
 <template>
-  <svg
-    class="icon outbound"
-    xmlns="http://www.w3.org/2000/svg"
-    aria-labelledby="outbound-link-title"
-    role="img"
-    focusable="false"
-    x="0px"
-    y="0px"
-    viewBox="0 0 100 100"
-    width="15"
-    height="15"
-  >
-    <title id="outbound-link-title">{{ openInNewWindowTitle }}</title>
-    <path
-      fill="currentColor"
-      d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"
-    />
-    <polygon
-      fill="currentColor"
-      points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"
-    />
-  </svg>
+  <span>
+    <svg
+      class="icon outbound"
+      xmlns="http://www.w3.org/2000/svg"
+      aria-hidden="true"
+      focusable="false"
+      x="0px"
+      y="0px"
+      viewBox="0 0 100 100"
+      width="15"
+      height="15"
+    >
+      <path
+        fill="currentColor"
+        d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"
+      />
+      <polygon
+        fill="currentColor"
+        points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"
+      />
+    </svg>
+    <span class="sr-only">{{ openInNewWindowTitle }}</span>
+  </span>
 </template>
 
 <script>

packages/@vuepress/theme-default/styles/index.styl

@@ -189,6 +189,16 @@ th, td
     .sidebar
       top 0
 
+.sr-only 
+  position absolute
+  width 1px
+  height 1px
+  padding 0
+  margin -1px
+  overflow hidden
+  clip rect(0, 0, 0, 0)
+  white-space nowrap
+  border-width 0
 
 @media (min-width: ($MQMobile + 1px))
   .theme-container.no-sidebar

yarn.lock

@@ -12530,15 +12530,15 @@ strip-indent@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/strip-indent/-/strip-indent-2.0.0.tgz#5ef8db295d01e6ed6cbf7aab96998d7822527b68"
 
-strip-json-comments@^2.0.1, strip-json-comments@~2.0.1:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/strip-json-comments/-/strip-json-comments-2.0.1.tgz#3c531942e908c2697c0ec344858c286c7ca0a60a"
-
 strip-json-comments@^3.0.1:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/strip-json-comments/-/strip-json-comments-3.0.1.tgz#85713975a91fb87bf1b305cca77395e40d2a64a7"
   integrity sha512-VTyMAUfdm047mwKl+u79WIdrZxtFtn+nBxHeb844XBQ9uMNTuTHdx2hc5RiAJYqwTj3wc/xe5HLSdJSkJ+WfZw==
 
+strip-json-comments@~2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/strip-json-comments/-/strip-json-comments-2.0.1.tgz#3c531942e908c2697c0ec344858c286c7ca0a60a"
+
 strong-log-transformer@^2.0.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/strong-log-transformer/-/strong-log-transformer-2.1.0.tgz#0f5ed78d325e0421ac6f90f7f10e691d6ae3ae10"
@@ -12838,13 +12838,14 @@ textlint-rule-stop-words@^1.0.17:
     split-lines "^2.0.0"
     textlint-rule-helper "^2.0.0"
 
-textlint-rule-terminology@^1.1.30:
-  version "1.1.30"
-  resolved "https://registry.yarnpkg.com/textlint-rule-terminology/-/textlint-rule-terminology-1.1.30.tgz#b9c5e8c665132dea2b141e3fe995316159c2d296"
+textlint-rule-terminology@^2.1.4:
+  version "2.1.4"
+  resolved "https://registry.yarnpkg.com/textlint-rule-terminology/-/textlint-rule-terminology-2.1.4.tgz#d6004ae65dbe757b2f4c7bd2bf0fe77d202f0c14"
+  integrity sha512-kLw4qL8RwY2lCNqgKveHc5sjCDlS5Tdw2TXWOrHvSvQxqaVOwsv3+51oMIQLGfJzQrhFSMlSlw5MvfaOerBvPQ==
   dependencies:
-    lodash "^4.17.4"
-    strip-json-comments "^2.0.1"
-    textlint-rule-helper "^2.0.0"
+    lodash "^4.17.15"
+    strip-json-comments "^3.0.1"
+    textlint-rule-helper "^2.1.1"
 
 textlint-rule-write-good@^1.6.2:
   version "1.6.2"