Step 1 . Check your karma.conf.js file it should having coverage directory mentioned
dir: require(‘path’).join(__dirname, ‘./coverage/<your project name>’),
reports: [‘html’, ‘lcovonly’, ‘text-summary’],
Step 2 : run : ng test — code-coverage
It will create a folder name <your project name> inside Project folder Coverage folder.
Step 3. Serve that folder with any http server on any port.
Example server using : node server , python server
I am serving using chrome app: web server
then giving port and open it. now in browser see progress.