diff --git a/lib/base/front/front.class.php b/lib/base/front/front.class.php
index d020227208..fcf22ff917 100644
--- a/lib/base/front/front.class.php
+++ b/lib/base/front/front.class.php
@@ -543,6 +543,11 @@ class baseHTML
         $app->loadClass('purifier', true);
         $purifierConfig   = HTMLPurifier_Config::createDefault();
         $purifierConfig->set('Cache.DefinitionImpl', null);
+
+        /* 设置a标签允许的特殊属性，应用于高亮左侧导航。 */
+        $def = $purifierConfig->getHTMLDefinition(true);
+        $def->addAttribute('a', 'data-app', 'CDATA');
+
         $purifier = new HTMLPurifier($purifierConfig);
 
         return $purifier->purify($button);