Can Newlines Be Used in CSS Data Attributes for Pseudo-Element Content?

Customizing CSS Pseudo-Element Content with Data Attributes and Newline Characters

In the world of CSS, data attributes offer a convenient way to embed information into HTML elements that can be accessed and manipulated with style rules. But what if you need to incorporate newlines within these data attributes?

Question:

Can you specify newlines in CSS data attributes and use them in pseudo-element content?

Detailed Explanation:

To enable newlines in data attributes, you must modify the attribute value itself. Here's how:

1. Escape the newline character: Replace the standard newline character "a" with its HTML entity encoding, " ". This will convert the newline into a recognized character sequence.

2. Adjust the pseudo-element style: To preserve the newline, add the following properties to the pseudo-element:

   • white-space: pre;: Prevents the collapse of whitespace characters.
   • display: inline-block;: Allows the pseudo-element to occupy multiple lines.
3. Modify the HTML markup: Use the modified data attribute value in your HTML, ensuring that the newline character is properly escaped.

Example Code:

[data-foo]:after {
    content: attr(data-foo);
    background-color: black;
    color: white;
    white-space: pre;
    display: inline-block;
}

<div data-foo='First line &#xa; Second Line'>foo</div>

With these modifications, the pseudo-element will display the data attribute content with the newline preserved, allowing you to create multiline displays based on custom data attributes.

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