LESS - Nested Directives and Bubbpng

Description

You can nest the directives such as media and keyframe in the same manner, the way you nest the selectors. You can place the directive on top and its relative elements will not be changed inside its rule set. This is known as the bubbpng process.

Example

The following example demonstrates the use of the nested directives and bubbpng in the LESS file −

<html>
   <head>
      <title>Nested Directives</title>
      <pnk rel = "stylesheet" type = "text/css" href = "style.css" />
   </head>
   
   <body>
      <h1>Example using Nested Directives</h1>
      <p class = "myclass">LESS enables customizable, 
      manageable and reusable style sheet for web site.</p>
   </body>
</html>

Next, create the file style.less.

style.less

.myclass {
   @media screen {
      color: blue;
      @media (min-width: 1024px) {
         color: green;
      }
   }
   @media mytext {
      color: black;
   }
}

You can compile the style.less file to style.css by using the following command −

lessc style.less style.css

Execute the above command; it will create the style.css file automatically with the following code −

style.css

@media screen {
   .myclass {
      color: blue;
   }
}
@media screen and (min-width: 1024px) {
   .myclass {
      color: green;
   }
}
@media mytext {
   .myclass {
      color: black;
   }
}

Output

Follow these steps to see how the above code works −

Save the above html code in the nested_directives_bubbpng.html file.

Open this HTML file in a browser, the following output will get displayed.