I'm new in Magento 2 and I learning it now. I am trying to customize email templates by editing default /app/design/frontend/Vendor/Theme/web/css/email-inline.less file in my theme, but I not understand one thing.
When I commented all lines in this file (and deleted @magento_import), I clear cache and deploy static files for my theme:
grunt clean:Theme && php bin/magento setup:static-content:deploy
After this command invoked successfully, I checked files email-inline.less and email-inline.css in /pub/static/frontend/Vendor/Theme/Locale/css/ directory.
File email-inline.less same as in my theme, but email-inline.css for some reason is not empty.
Why does it happen?