CSS Child vs Descendant selectors

Question

I am a bit confused between these 2 selectors.

Does the descendent selector:

div p

select all p withi

Answer 1

Bascailly, "a b" selects all b's inside a, while "a>b" selects b's what are only children to the a, it will not select b what is child of b what is child of a.

This example illustrates the difference:

div span{background:red}
div>span{background:green}

abcdefghi

Background color of abc and def will be green, but ghi will have red background color.

IMPORTANT: If you change order of the rules to:

div>span{background:green}
div span{background:red}

All letters will have red background, because descendant selector selects child's too.