LESS - Default Variables

Description

Default variable has an ability to set a variable only when it's not already set. This feature is not required because variables can be easily overridden by defining them afterwards.

Example

The following example demonstrates the use of default variables in the LESS file −

<html>
   <head>
      <link rel = "stylesheet" href = "style.css" type = "text/css" />
      <title>LESS Default Variables</title>
   </head>

   <body>
      <h1>Welcome to Tutorialspoint</h1>
      <p>LESS is a CSS pre-processor that enables customizable, 
      manageable and reusable style sheet for web site.</p>
   </body>
</html>

Now create the file style.less.

style.less

@import "http://www.tutorialspoint.com/less/lib.less"; // first declaration of @color
@color: green; // this will override @color defined previously
p {
   color : @color;
}

The following code will import the lib.less file into style.less from the https://www.tutorialspoint.com/less/lib.less path −

lib.less

@color: blue;

You can compile the style.less 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

p {
   color: green;
}

Output

Follow these steps to see how the above code works −

  • Save the above html code in the less_default_variables.html file.

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

LESS Default Variables
less_variables.htm
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