<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>{{ page.title }}</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
  </head>
  <body>
    {{ content }}
  </body>
</html>

{% include base.html %}

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>{{ page.title }}</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
  </head>
  <body>
    {{ content }}
  </body>
</html>

Include base partial for base variable
Include base partial for base variable