Before deployment, is there tool to compress HTML class attribute and CSS selectors?

Question

In current project, I was asked for compressing the HTML class attribute and corresponding CSS selectors before deployment. For example, the code on

Answer 1

There is also gulp-selectors.

Install it:

npm install gulp gulp-selectors

Now a quick-and-dirty node script:

var gulp = require('gulp');
var gs = require('gulp-selectors');
gulp
  .src(['*.html', '*.css'])
  .pipe(gs.run({}, '{ids: "*"}'))
  .pipe(gulp.dest('.'))'

The second argument to gs.run() is in order for it to leave IDs as-is, see also its website: https://www.npmjs.com/package/gulp-selectors