title: What do square brackets mean in html?
body: <p>I am assisting on a project right now and building out templates for the first time, trying to wrap my head around a few things but one aspect of the html that's confusing me are certain things sitting in square brackets. I've never used these in html before so I'm just wondering what they are for (when I open the page in a browser they all show up as text) </p>
  
  <p>Here's a bit of the code: </p>
  
  <pre><code>&lt;div class="container"&gt;
     [HASBREADCRUMBS]
     &lt;ol class="nav-breadcrumb"&gt;
        [BREADCRUMBS]
     &lt;/ol&gt;
     [/HASBREADCRUMBS]
     &lt;h1 class="header-title" style="color:[TITLECOLOR];font-size:[TITLESIZE];"&gt;[TITLE]&lt;/h1&gt;
  &lt;/div&gt;
  </code></pre>