red dot in chrome debugger when writing LESS?

问题

I'm transforming my css files into LESS file.

only part of my LESS is working well and I see a weird red dot line in the chrome debugger for those problematic lines,

any idea what they means?

回答1:

http://codemirror.net/doc/releases.html says that Version 2.33 of CodeMirror introduced "Show non-printing characters as red dots."

来源：https://stackoverflow.com/questions/23267505/red-dot-in-chrome-debugger-when-writing-less