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How to Retrieve Attribute Values in CSS

How to Retrieve Attribute Values in CSS

Ferenc Almasi β€’ 2020 November 04 β€’ Read time 1 min read
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CSS

Use the attr() property in CSS if you want to retrieve the value of an element's attribute and use it in your stylesheets:

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<span data-icon="🌺" data-name="Hibiscus"></span>
<style>
    span::before {
        content: attr(data-name);
    }
</style>
attr.html

In the example above, the value of the attr() funcion will be "Hibiscus". You can also specify types to attr(), using the following way:

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.types {
    attr(data-src url);      /* Define type as url */
    attr(data-score number); /* Define type as number */
    attr(data-width px);     /* Define type as pixel */
}
types.css

By using a second parameter, you also have the ability to provide fallback values:

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.defaults {
    attr(data-src url, '');       /* Will fallback to an empty string */
    attr(data-width px, inherit); /* Will fallback to the inherited property */
    attr(data-name, 'Unknown');   /* Will fallback to "Unknown" */
}
defaults.css
How to retrieve attribute values in CSS
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