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

Case-Insensitive Attribute Matching with "i" in CSS Attribute Selectors

In the context of CSS attribute selectors, a question arose regarding the significance of the letter "i" in a code snippet:

[type="checkbox" i]

Answer:

The "i" appended to the attribute value "checkbox" indicates case-insensitive attribute matching. It's a feature introduced in CSS Selectors Level 4 that allows for more flexible and inclusive matching of element attributes.

Browser Support:

This feature is currently supported in:

• Chrome 49
• Firefox 47
• Safari 9
• Opera 37 (and potentially earlier versions)

Demonstration:

Here's a sample code to illustrate the working of case-insensitive attribute matching:

[data-test] {
    width: 100px;
    height: 100px;
    margin: 4px;
}

[data-test="A"] {
    background: red;
}

[data-test="a" i] {
    background: green;
}

Green if supported, red if not:

<div data-test="A"></div>

If your browser supports case-insensitive attribute matching, the sample element will have a green background. Otherwise, it will have a red background.

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