I love nesting my @media query breakpoints. It’s perhaps the most important feature of Sass to me. Maybe I pick a method and do it like this:

.element { display: grid; grid-template-columns: 100px 1fr; @include breakpoint(baby-bear) { display: block; }
}

That’s straightforward enough. But what if my element has several sub-elements and the breakpoint affects them as well? There are different approaches, and I’m never quite sure which one I should be doing.

I could duplicate the breakpoint for each child:

.parent { @include breakpoint(desktop) { } .child { @include breakpoint(desktop) { } } .child-2 { @include breakpoint(desktop) { } } }

The compiled CSS comes out to something like this:

@media screen and (min-width: 700px) { .parent { }
}
@media screen and (min-width: 700px) { .parent .child { }
}
@media screen and (min-width: 700px) { .parent .child-2 { }
}

Or, I could duplicate the children under the first nested breakpoint:

.parent { @include breakpoint(desktop) { .child { } .child-2 { } } .child { } .child-2 { } }

That results in:

@media screen and (min-width: 700px) { .parent .child { } .parent .child-2 { }
}
.parent .child {
}
.parent .child-2 {
}

Or I could do a combination of the two. Neither of them feels particularly great because of the duplication, but I’m not sure there is a perfect answer here. I err a little more on duplicating the media query, as it seems less error-prone than duplicating selectors.

Source : CSS-Tricks

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