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Case-insensitive CSS attribute selectors

In CSS, using an i after the]' allows for case-insensitive matching. For example, [b='xyz'] will match both and .

Last updated on : 2026-02-09

Browser Versions

IEIE

EdgeEdge

FirefoxFirefox

ChromeChrome

SafariSafari

OperaOpera

5.5 - 11
Test on IE 5.5 - 11 ...
12 - 18
Test on Edge 12 - 18 ...
79 - 144
Test on Edge 79 - 144 ...
2 - 46
Test on Firefox 2 - 46 ...
47 - 150
Test on Firefox 47 - 150 ...
4 - 48
Test on Chrome 4 - 48 ...
49 - 147
Test on Chrome 49 - 147 ...
3.2 - 8
Test on Safari 3.2 - 8 ...
9.1 - 26.3
Test on Safari 9.1 - 26.3 ...
9.5 - 35
Test on Opera 9.5 - 35 ...
36 - 125
Test on Opera 36 - 125 ...

...Fully Supported

...Partially

...No Support

Specifications

Selectors Level 4 # attribute-selectors

Browser Compatibility

Case-insensitive CSS attribute selectors on IE is not supported on any IE versions.

Case-insensitive CSS attribute selectors on Edge is fully supported on 79-144, and not supported on 12-18 Edge versions.

Case-insensitive CSS attribute selectors on Firefox is fully supported on 47-150, and not supported on 2-46 Firefox versions.

Case-insensitive CSS attribute selectors on Chrome is fully supported on 49-147, and not supported on 4-48 Chrome versions.

Case-insensitive CSS attribute selectors on Safari is fully supported on 9.1-26.3, and not supported on 3.2-8 Safari versions.

Case-insensitive CSS attribute selectors on Opera is fully supported on 36-125, and not supported on 9.5-35 Opera versions.

Case-insensitive CSS attribute selectors on Safari on iOS is fully supported on 9.3-26.3, and not supported on 3.2-8 Safari on iOS versions.

Case-insensitive CSS attribute selectors on Android Browser is fully supported on 97-144, and not supported on 2.3-4 Android Browser versions.

Case-insensitive CSS attribute selectors on Opera Mobile is fully supported on 64-80, and not supported on 10-12 Opera Mobile versions.

Case-insensitive CSS attribute selectors on Chrome for Android is fully supported on all Chrome for Android versions.

Case-insensitive CSS attribute selectors on Firefox for Android is fully supported on all Firefox for Android versions.

Case-insensitive CSS attribute selectors on Samsung Internet is fully supported on 5-29, and not supported on 4-4 Samsung Internet versions.

Browser Support for Case-insensitive CSS attribute selectors

References

Data sourced from

92
Hightooltip

Overall Browser Compatibility Score

Note:Case-insensitive CSS attribute selectors shows a browser compatibility score of 92. This is a collective score out of 100 to represent browser support of a web technology. The higher this score is, the greater is the browser compatibility. The browser compatibility score is not a 100% reflection for every browser and the web technology support. However, it does give you an estimate on how much you should rely on a particular web technology in terms of browser compatibility.

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