Let say you are working on a website template that has many pages (index.html, blog.html, contact.html...). You start by designing the home page and then move on to other pages. While you are on other pages, you think of some improvements and these improvements must affect the whole website.
So I return to each page and make the change. This is quite unproductive especially when you have 6 or more pages and sometimes you forget to update the change.
If it were PHP, I would do
require ('header.php');
This worked for me well. But right now, I'm working on HTML and don't really like to transform to PHP and then again to HTML.
So do you have a specific method/way of doing this?