diff --git a/src/core/render/tpl.js b/src/core/render/tpl.js
index 2bad3a311..595cdff76 100644
--- a/src/core/render/tpl.js
+++ b/src/core/render/tpl.js
@@ -91,7 +91,8 @@ export function tree(toc, tpl = '<ul class="app-sub-sidebar">{inner}</ul>') {
 
   let innerHTML = '';
   toc.forEach(node => {
-    innerHTML += `<li><a class="section-link" href="${node.slug}" title="${node.title}">${node.title}</a></li>`;
+    const title = node.title.replace(/(<([^>]+)>)/g, '');
+    innerHTML += `<li><a class="section-link" href="${node.slug}" title="${title}">${node.title}</a></li>`;
     if (node.children) {
       innerHTML += tree(node.children, tpl);
     }
diff --git a/test/unit/render-util.test.js b/test/unit/render-util.test.js
index 3a82a0f9d..5d556168f 100644
--- a/test/unit/render-util.test.js
+++ b/test/unit/render-util.test.js
@@ -1,4 +1,5 @@
 const { removeAtag } = require(`${SRC_PATH}/core/render/utils`);
+const { tree } = require(`${SRC_PATH}/core/render/tpl`);
 
 // Suite
 // -----------------------------------------------------------------------------
@@ -13,3 +14,30 @@ describe('core/render/utils', () => {
     });
   });
 });
+
+describe('core/render/tpl', () => {
+  test('remove html tag in tree', () => {
+    const result = tree([
+      {
+        level: 2,
+        slug: '#/cover?id=basic-usage',
+        title: '<span style="color:red">Basic usage</span>',
+      },
+      {
+        level: 2,
+        slug: '#/cover?id=custom-background',
+        title: 'Custom background',
+      },
+      {
+        level: 2,
+        slug: '#/cover?id=test',
+        title:
+          '<img src="/docs/_media/favicon.ico" data-origin="/_media/favicon.ico" alt="ico">Test',
+      },
+    ]);
+
+    expect(result).toEqual(
+      `<ul class="app-sub-sidebar"><li><a class="section-link" href="#/cover?id=basic-usage" title="Basic usage"><span style="color:red">Basic usage</span></a></li><li><a class="section-link" href="#/cover?id=custom-background" title="Custom background">Custom background</a></li><li><a class="section-link" href="#/cover?id=test" title="Test"><img src="/docs/_media/favicon.ico" data-origin="/_media/favicon.ico" alt="ico">Test</a></li></ul>`
+    );
+  });
+});