diff --git a/aria-practices.html b/aria-practices.html
index a93c8be7f5..145c2e0602 100644
--- a/aria-practices.html
+++ b/aria-practices.html
@@ -1,13 +1,13 @@
 <!DOCTYPE html>
 <html xmlns="http://www.w3.org/1999/xhtml" lang="en-US" xml:lang="en-US">
 <head>
-	<meta charset="utf-8" />
-	<title>WAI-ARIA Authoring Practices 1.1</title>
-	<script src="https://www.w3.org/Tools/respec/respec-w3c-common" class="remove"></script>
-	<script src="common/script/resolveReferences.js" class="remove"></script>
-	<script src="common/biblio.js" class="remove"></script>
-	<script src="respec-config.js" class="remove"></script>
-	<link href="common/css/common.css" rel="stylesheet" type="text/css" />
+  <meta charset="utf-8" />
+  <title>WAI-ARIA Authoring Practices 1.1</title>
+  <script src="https://www.w3.org/Tools/respec/respec-w3c-common" class="remove"></script>
+  <script src="common/script/resolveReferences.js" class="remove"></script>
+  <script src="common/biblio.js" class="remove"></script>
+  <script src="respec-config.js" class="remove"></script>
+  <link href="common/css/common.css" rel="stylesheet" type="text/css" />
 </head>
 <body>
   <section id="abstract">
