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Usage

less

@fontsize: 12px;
@lineHeight: @fontsize + 4px;

.u-text {
    font-size: @fontsize;
    line-height: @lineHeight;
}

less
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json

{
  "name": "@json",
  "version": "0.0.1"
}

json
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html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Demo</title>
  </head>
  <body>
    <header></header>
    <article></article>
    <footer></footer>
  </body>
</html>

html
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some normal text.