Feature detection in CSS using @supports checks if a browser supports a specific feature before applying related styles. 1. It uses conditional CSS blocks based on property-value pairs, such as @supports (display: grid). 2. This method ensures future compatibility and avoids reliance on unreliable browser detection. 3. Common use cases include safely adopting new layout features, testing for specific property-value support, and providing fallback styles. 4. Complex conditions can be created with logical operators like and, or, and not. 5. However, it does not apply to JavaScript features, which require separate tools like Modernizr or the CSS.supports() method.
Feature detection in CSS using @supports is a way to check if a browser supports a specific CSS feature before applying styles that depend on it. This helps ensure your design works well across different browsers, even when some don't support newer CSS properties or values.
How Does @supports Work?
The @supports rule lets you write conditional CSS blocks. You provide a condition — usually a CSS property and value pair — and the browser applies the styles inside only if that condition is true (i.e., supported).
Here’s a basic example:
@supports (display: grid) {
.container {
display: grid;
grid-template-columns: repeat(3, 1fr);
}
}In this case, only browsers that support CSS Grid will apply those styles. Others will skip them entirely.
Why Use Feature Detection Instead of Browser Detection?
Trying to guess what a browser can do based on its name or version is unreliable. New versions come out all the time, and users might be running outdated or niche browsers. With @supports, you're checking for actual capability, not assumptions.
This means:
- Your code adapts better to future browsers.
- It gracefully handles older browsers without hacks.
- You avoid unnecessary polyfills or fallbacks when they’re not needed.
Common Use Cases for @supports
There are several practical ways people use @supports in real projects:
1. Using New Layout Features Safely
If you want to try something like aspect-ratio or subgrid, wrap it in @supports so older browsers don’t break.
@supports (aspect-ratio: 1/1) {
.box {
aspect-ratio: 16/9;
}
}2. Testing for Property-Value Pairs
Sometimes a browser supports a property but not a specific value. @supports can test for both.
@supports (background: linear-gradient(to right, red, blue)) {
body {
background: linear-gradient(to right, red, blue);
}
}3. Providing Fallback Styles
You can also use it to offer simpler styles when a feature isn’t available.
.container {
display: block; /* Fallback */
}
@supports (display: grid) {
.container {
display: grid;
}
}A Few Things to Keep in Mind
- You can combine conditions with
and,or, andnot. - Nesting
@supportsrules is possible but rarely needed. - It doesn’t help with JavaScript features — use tools like Modernizr or native
CSS.supports()in JS for that.
Here's a slightly more complex condition:
@supports (display: grid) and (not (-webkit-appearance: none)) {
/* Only applies if grid is supported AND -webkit-appearance is NOT supported */
}That kind of logic can be useful in edge cases, but most of the time, simple checks are enough.
基本上就這些。Using @supports is straightforward once you understand how to structure the condition. It's a powerful tool for writing modern, resilient CSS without breaking things for users on older platforms.
The above is the detailed content of What is feature detection in CSS using @supports?. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
How to use PHP to build social sharing functions PHP sharing interface integration practice
Jul 25, 2025 pm 08:51 PM
The core method of building social sharing functions in PHP is to dynamically generate sharing links that meet the requirements of each platform. 1. First get the current page or specified URL and article information; 2. Use urlencode to encode the parameters; 3. Splice and generate sharing links according to the protocols of each platform; 4. Display links on the front end for users to click and share; 5. Dynamically generate OG tags on the page to optimize sharing content display; 6. Be sure to escape user input to prevent XSS attacks. This method does not require complex authentication, has low maintenance costs, and is suitable for most content sharing needs.
PHP creates a blog comment system to monetize PHP comment review and anti-brush strategy
Jul 25, 2025 pm 08:27 PM
1. Maximizing the commercial value of the comment system requires combining native advertising precise delivery, user paid value-added services (such as uploading pictures, top-up comments), influence incentive mechanism based on comment quality, and compliance anonymous data insight monetization; 2. The audit strategy should adopt a combination of pre-audit dynamic keyword filtering and user reporting mechanisms, supplemented by comment quality rating to achieve content hierarchical exposure; 3. Anti-brushing requires the construction of multi-layer defense: reCAPTCHAv3 sensorless verification, Honeypot honeypot field recognition robot, IP and timestamp frequency limit prevents watering, and content pattern recognition marks suspicious comments, and continuously iterate to deal with attacks.
What are common CSS browser inconsistencies?
Jul 26, 2025 am 07:04 AM
Different browsers have differences in CSS parsing, resulting in inconsistent display effects, mainly including the default style difference, box model calculation method, Flexbox and Grid layout support level, and inconsistent behavior of certain CSS attributes. 1. The default style processing is inconsistent. The solution is to use CSSReset or Normalize.css to unify the initial style; 2. The box model calculation method of the old version of IE is different. It is recommended to use box-sizing:border-box in a unified manner; 3. Flexbox and Grid perform differently in edge cases or in old versions. More tests and use Autoprefixer; 4. Some CSS attribute behaviors are inconsistent. CanIuse must be consulted and downgraded.
How to build a PHP Nginx environment with MacOS to configure the combination of Nginx and PHP services
Jul 25, 2025 pm 08:24 PM
The core role of Homebrew in the construction of Mac environment is to simplify software installation and management. 1. Homebrew automatically handles dependencies and encapsulates complex compilation and installation processes into simple commands; 2. Provides a unified software package ecosystem to ensure the standardization of software installation location and configuration; 3. Integrates service management functions, and can easily start and stop services through brewservices; 4. Convenient software upgrade and maintenance, and improves system security and functionality.
Describe the `vertical-align` property and its typical use cases
Jul 26, 2025 am 07:35 AM
Thevertical-alignpropertyinCSSalignsinlineortable-cellelementsvertically.1.Itadjustselementslikeimagesorforminputswithintextlinesusingvalueslikebaseline,middle,super,andsub.2.Intablecells,itcontrolscontentalignmentwithtop,middle,orbottomvalues,oftenu
What is the accent-color property?
Jul 26, 2025 am 09:25 AM
accent-color is an attribute used in CSS to customize the highlight colors of form elements such as checkboxes, radio buttons and sliders; 1. It directly changes the default color of the selected state of the form control, such as changing the blue check mark of the checkbox to red; 2. Supported elements include input boxes of type="checkbox", type="radio" and type="range"; 3. Using accent-color can avoid complex custom styles and extra DOM structures, and maintain native accessibility; 4. It is generally supported by modern browsers, and old browsers need to be downgraded; 5. Set accent-col
How to compile SCSS to CSS?
Jul 27, 2025 am 01:58 AM
InstallDartSassvianpmafterinstallingNode.jsusingnpminstall-gsass.2.CompileSCSStoCSSusingthecommandsassinput.scssoutput.css.3.Usesass--watchinput.scssoutput.csstoauto-compileonsave.4.Watchentirefolderswithsass--watchscss:css.5.Usepartialswith_prefixfo
How to change text color in CSS?
Jul 27, 2025 am 04:25 AM
To change the text color in CSS, you need to use the color attribute; 1. Use the color attribute to set the text foreground color, supporting color names (such as red), hexadecimal codes (such as #ff0000), RGB values (such as rgb(255,0,0)), HSL values (such as hsl(0,100%,50%)), and RGBA or HSLA with transparency (such as rgba(255,0,0,0.5)); 2. You can apply colors to any element containing text, such as h1 to h6 titles, paragraph p, link a (note the color settings of different states of a:link, a:visited, a:hover, a:active), buttons, div, span, etc.; 3. Most
