What Does `@media screen and (max-width: 1024px)` Do in CSS?

Understanding @media screen and (max-width: 1024px) in CSS

Encountering unfamiliar CSS code can be puzzling. In a recent instance, a developer inherited code that included the following enigmatic line:

@media screen and (max-width: 1024px) {
    img.bg {
        left: 50%;
        margin-left: -512px;
    }
}

To decode this enigmatic line, let's delve into the significance of media queries.

Media queries, like the one presented in the code, are used to apply styling rules conditionally based on certain criteria. In this case, the criteria being tested are:

1. @media screen: This ensures that the CSS rules will only be applied to devices identified as desktop-class browsers.

2. (max-width: 1024px): This condition restricts the application of the CSS rules to devices with a browser window width (including scrollbars) of 1024 pixels or less.

Based on these criteria, the CSS rules enclosed within the braces will only be applied to devices that meet both conditions, which are predominantly aimed at limiting styling to devices such as the iPad and iPhone.

It's important to note, however, that desktop browser windows with a width below 1024 pixels will also inherit the CSS styles in browsers that support the max-width media query.

For further clarification, refer to the comprehensive Media Queries specification at: http://www.w3.org/TR/css3-mediaqueries/

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