How Does the \'i\' Flag Enable Case-Insensitive Attribute Matching in CSS?

Understanding the Meaning of "i" in CSS Attribute Selectors

In modern web development, CSS attribute selectors play a crucial role in styling elements based on their attributes. One such attribute is "i", which may raise questions about its significance.

Interpreting the CSS Selector [type="checkbox" i]

The snippet you have provided, [type="checkbox" i], exemplifies a newly introduced feature in CSS Selectors Level 4: case-insensitive attribute matching. This feature enables matching attributes regardless of capitalization differences.

Availability and Support

Presently, this feature finds widespread support across major browser versions:

• Chrome 49
• Firefox 47
• Safari 9
• Opera 37

However, it has been available in Chrome's user-agent styles since version 39 but required enabling experimental features for usage on web content.

Example for Browser Testing

To test this feature's support in different browsers, you can utilize the following HTML/CSS snippet:

<br>[data-test] {<pre class="brush:php;toolbar:false">width: 100px;
height: 100px;
margin: 4px;

}

[data-test="A"] {

background: red;

}

[data-test="a" i] {

background: green;

}

In supported browsers, the div element will be green, indicating successful case-insensitive matching. Otherwise, it will be red.

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