Answer 1

take a property, or properties from its parent, i mean
if you have a class for all <p> "color" , but in your document,
foother have a diferent background color as body, and you set a color for text in foother, inside puts a paragraphs, all <p> inside foother have as parent "foother" , in css you set #foother .p{ ...}

i hope be helpfully, ¡! ;)