css3 - What do -- classes mean in SASS / CSS? -


i have seen people use -- signs quite bit, if remember correctly in use cases these:

.myclass {   //some stuff    .--large {     //other stuff   }  }

is naming convention extension of parent, or there sass / css specific it? or example maybe off? not sure remember correctly, couldn't find on internet.

it's bem modifier naming convention. can read here:

http://getbem.com/naming/


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