Understanding Blogger’s Template System as a Developer

After spending more time exploring Blogger, I started to look beyond the surface and dig into how its template system actually works.

At first, it felt unfamiliar. Instead of the usual setup I’m used to with frameworks like Vue or Nuxt, Blogger uses a mix of HTML and XML with its own set of custom tags. Seeing things like <b:section>, <b:widget>, and <b:includable> for the first time was a bit confusing.

But once I stepped back and tried to understand the structure, it started to make more sense.

The way Blogger templates are built is actually quite similar to component-based thinking. A <b:widget> acts like a container or module, and inside it, <b:includable> blocks define reusable pieces of layout. These blocks can then be rendered using <b:include>, which feels very similar to calling a component or including a partial in other systems.

One of the key parts is how data is handled. Instead of using variables like we normally would, Blogger uses tags like <data:post.title/> or <data:blog.title/> to inject dynamic content. It’s not as flexible as working with JavaScript directly, but it gets the job done for rendering content.

Loops and conditions are also handled differently. <b:loop> is used to iterate over posts, and <b:if> controls conditional rendering. It reminded me a lot of v-for and v-if, just written in a different syntax.

What I found interesting is how everything is scoped. Includable blocks inside a widget are not globally accessible, which forces you to think carefully about structure and reuse. It’s a bit limiting, but it also keeps things organized in its own way.

The more I explored, the more I realized that Blogger isn’t really meant to compete with modern frontend frameworks. Instead, it works best as a structured templating system for content. Once you accept that, it becomes easier to work with instead of against it.

This also gave me a better understanding of how a site builder can be built on top of Blogger. It’s not about replacing the system, but about extending it and working within its boundaries.

There’s still a lot I haven’t explored yet, especially when it comes to pushing the UI further with custom styling and layout changes. But understanding the template system is definitely a good starting point.

-Juan