Do All Browsers Support Nested @media Rules in CSS, and How Can We Ensure Consistent Styling?

Nesting @media Rules in CSS: Browser Support and Consistency

Nesting @media rules in CSS has been a subject of confusion regarding browser support. The question arises, "Which browsers support this functionality, and how can we ensure consistency?"

Browser Support

первоначально, nesting of @media rules was not supported in CSS2.1. However, CSS3 introduced this feature, as outlined in the Conditional Rules module. Modern browsers now universally support nesting of @media at-rules, with Microsoft Edge being the only exception.

Consistency

The code provided in the question exhibits nested @media rules:

@media screen and (min-width: 480px) {

    body{
        background-color:#6aa6cc;
        color:#000;
    }

    @media screen and (min-width: 768px) {

        body{
            background-color:#000;
            color:#fff;
        }
    }
}

In CSS3, this code should work as intended, with the appropriate styles being applied based on the specified media queries. The discrepancy between Firefox and other browsers arises because Firefox has implemented the CSS3 specification, while other browsers are still conforming to the older CSS2.1 standard, which does not allow nested @media rules.

Workaround

To ensure consistency across all browsers, consider using the following approach:

@media screen and (min-width: 480px) {
    body {
        background-color: #6aa6cc;
        color: #000;
    }
}

@media screen and (min-width: 768px) {
    body {
        background-color: #000;
        color: #fff;
    }
}

By removing the nesting, the code will behave consistently across all browsers until full implementation of CSS3 by all major browsers.

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