PostCSS

The build will fail under any of the following conditions:

• Node.js is not installed
• The postcss package is not installed
• The postcss-cli package is not installed
• The autoprefixer package is not installed

CSS

::placeholder {
  color: gray;
}

CSS after PostCSS (autoprefix)

::-moz-placeholder {
  color: gray;
}
::placeholder {
  color: gray;
}