diff --git a/includes/head.html b/includes/head.html
index 30c08fbd81..3eba2d1610 100644
--- a/includes/head.html
+++ b/includes/head.html
@@ -1,4 +1,5 @@
 <head>
+  <meta charset="utf-8" />
   <title>{% if error == '404' %}{{ site.data.ui.errors.oops }}{% elsif currentVersion == 'homepage' %}GitHub Documentation{% else %}{{ page.fullTitle }}{% endif %}</title>
   <meta name="viewport" content="width=device-width, initial-scale=1">{% if page.hidden %}
   <meta name="robots" content="noindex" />{% endif %}
diff --git a/layouts/default.html b/layouts/default.html
index 3981947a25..cbb745a516 100644
--- a/layouts/default.html
+++ b/layouts/default.html
@@ -1,3 +1,4 @@
+<!doctype html>
 <html lang="{{currentLanguage}}">
   {% include head %}
 
diff --git a/layouts/product-landing.html b/layouts/product-landing.html
index a4823ec06d..5bd1189b1a 100644
--- a/layouts/product-landing.html
+++ b/layouts/product-landing.html
@@ -1,9 +1,10 @@
+<!doctype html>
 <html lang="{{currentLanguage}}">
   {% include head %}
 
   <body class="d-lg-flex">
     {% include sidebar %}
-    
+
     <main class="width-full">
       {% include header %}
 
