Science Knowings: CSS Course For Social Media

CSS Feature Queries

CSS Feature Queries

Welcome back to our session on CSS Feature Queries! In this session, we'll explore a powerful technique for detecting browser support for specific CSS features.

CSS Feature Queries allow us to conditionally apply styles based on whether the browser supports certain CSS properties or values.

What are Feature Queries?

CSS Feature Queries are a way to check if a browser supports specific CSS features. They enable us to provide customized styling based on the capabilities of the user's browser.

Why Use Feature Queries?

Feature Queries allow us to:

  • Provide graceful degradation of styles
  • Enhance the user experience by tailoring styles to supported features
  • Simplify development by reducing conditional statements in CSS

Syntax of CSS Feature Queries

The syntax for a CSS Feature Query follows this format:

@supports (condition) { /* CSS styles to apply */ }

The condition can be a specific CSS property or value you want to check for.

Matching for Specific Features

To match a specific feature, use the syntax:

@supports (feature: value) { /* CSS styles */ }

For example:

@supports (display: grid) { /* Styles for browsers supporting CSS Grid */ }

Matching for Negated Features

To match for the absence of a feature, use the not keyword:

@supports not (feature: value) { /* CSS styles */ }


@supports not (display: grid) { /* Styles for browsers without CSS Grid support */ }

Browser Support for CSS Feature Queries

Browser support for Feature Queries is excellent in modern browsers.

Check Can I Use for detailed support information.

Use Cases for CSS Feature Queries

Feature Queries can be used in various scenarios, including:

  • Detecting support for specific CSS properties or values
  • Progressive enhancement of UI features
  • Fallback styles for unsupported browsers

Detecting the Presence of CSS Properties

Feature Queries allow you to check if a browser supports specific CSS properties:

@supports (display: flex) { /* Styles for browsers supporting Flexbox */ }

Detecting the Value of CSS Properties

You can also check for specific values of CSS properties:

@supports (color: #ff0000) { /* Styles for browsers supporting #ff0000 */ }

Using Feature Queries for Progressive Enhancement

Progressive enhancement involves providing basic functionality for all browsers and enhancing it for browsers that support specific features:

@supports (display: grid) {
  /* Enhanced styles using CSS Grid */
/* Fallback styles for browsers without CSS Grid support */

Limitations of CSS Feature Queries

CSS Feature Queries have a few limitations:

  • They can only check for CSS features, not other browser capabilities.
  • They may not always provide accurate results due to browser inconsistencies.

Best Practices for Using CSS Feature Queries

Best practices for using Feature Queries include:

  • Use them sparingly for critical features.
  • Test thoroughly in different browsers.
  • Provide fallback styles for unsupported browsers.


CSS Feature Queries provide a powerful tool for detecting browser support for specific CSS features. They allow us to enhance the user experience and simplify development by applying styles conditionally.

By using Feature Queries effectively, we can create more robust and flexible web applications that adapt to the capabilities of users' browsers.

Next Topic: CSS Grid Frameworks

Next Up: CSS Grid Frameworks

In our next session, we'll dive into CSS Grid Frameworks and explore their power for creating complex layouts easily. Don't miss it! Follow us for updates.
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