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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 : 2025-11-11

Browser Versions

Edge

Firefox

Chrome

Safari

Opera

5.5 - 11

12 - 18

79 - 142

2 - 46

47 - 147

4 - 48

49 - 145

3.2 - 8

9.1 - 26.2

9.5 - 35

36 - 122

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 79-142, and not supported on 12-18 Edge versions.

Case-insensitive CSS attribute selectors on Firefox is fully supported on 47-147, and not supported on 2-46 Firefox versions.

Case-insensitive CSS attribute selectors on Chrome is fully supported on 49-145, and not supported on 4-48 Chrome versions.

Case-insensitive CSS attribute selectors on Safari is fully supported on 9.1-26.2, and not supported on 3.2-8 Safari versions.

Case-insensitive CSS attribute selectors on Opera is fully supported on 36-122, and not supported on 9.5-35 Opera versions.

Case-insensitive CSS attribute selectors on Safari on iOS is fully supported on 9.3-26.1, and not supported on 3.2-8 Safari on iOS versions.

Case-insensitive CSS attribute selectors on Android Browser is fully supported on 97-142, 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

Case-insensitive CSS attribute selectors on Chrome

Case-insensitive CSS attribute selectors on Safari

Case-insensitive CSS attribute selectors on Firefox

Case-insensitive CSS attribute selectors on Internet Explorer

Case-insensitive CSS attribute selectors on Opera

Case-insensitive CSS attribute selectors on Edge

References

Data sourced from

High

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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