What is the reasoning behind utilizing the "&" selector in CSS?

.navigation {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    transform: translateX(-100%);
    transition: translation: all ease 0.25s;

    &.expand {
        transform: translateX(0);
    }
}

JavaScript file:

$(document).ready(function (){
    ${".menu-toggle"}.on("click", function () {
        $(".navigation").toggleClass("expand");
    });
});

I am experiencing issues with the &.expand selector in my CSS code, which is being highlighted in red in my text editor (VS Code). Oddly enough, it worked fine for my instructor. Can you shed some light on why the "&" symbol is used in this context within CSS?

htmljquerycssbootstrap-4

Answer №1

&.classSelector or &:pseudo-class is an innovative SCSS method of defining selectors to target multiple scenarios within a className attribute. For example, in your code snippet, the .menu class includes the .open class within its structure in the <html> hierarchy. This technique effectively selects elements with both the classes .menu and .open, showcasing nested code capabilities in SASS-SCSS, a powerful CSS pre-processor. Traditional .CSS files may encounter difficulty interpreting this syntax, potentially leading to errors. I trust this explanation proves beneficial. Best of luck!

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