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Template Inheritance (Extends)

Template inheritance is how you avoid repeating HTML like headers/navbars/footers.

Create a base layout

templates/base.htmltemplates/base.html:

html
<!doctype html>
<html>
  <head>
    <title>{% block title %}My Site{% endblock %}</title>
  </head>
  <body>
    <nav>
      <a href="/">Home</a>
      <a href="/about">About</a>
    </nav>
 
    <main>
      {% block content %}{% endblock %}
    </main>
  </body>
</html>
html
<!doctype html>
<html>
  <head>
    <title>{% block title %}My Site{% endblock %}</title>
  </head>
  <body>
    <nav>
      <a href="/">Home</a>
      <a href="/about">About</a>
    </nav>
 
    <main>
      {% block content %}{% endblock %}
    </main>
  </body>
</html>

Extend it in a page

templates/home.htmltemplates/home.html:

html
{% extends "base.html" %}
 
{% block title %}Home{% endblock %}
 
{% block content %}
  <h1>Welcome!</h1>
{% endblock %}
html
{% extends "base.html" %}
 
{% block title %}Home{% endblock %}
 
{% block content %}
  <h1>Welcome!</h1>
{% endblock %}

Why this matters

  • One place to change your global layout
  • Consistent design
  • Easier to maintain as pages grow

🧪 Try It Yourself

Exercise 1 – Create a Flask App

Exercise 2 – Dynamic Route

Exercise 3 – Return JSON

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