CSSImportRule: layerName property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨March 2022⁩.

The read-only layerName property of the CSSImportRule interface returns the name of the cascade layer created by the @import at-rule.

If the created layer is anonymous, the string is empty (""), if no layer has been created, it is the null object.

Value

A string, that can be empty, or the null object.

The document's single stylesheet contains three @import rules. The first declaration imports a stylesheet into a named layer. The second declaration imports a stylesheet into an anonymous layer. The third declaration imports a stylesheet without a layer declaration.

The layerName property returns the name of the layer associated with the imported stylesheet.

css

@import "style1.css" layer(layer-1);
@import "style2.css" layer;
@import "style3.css";

const myRules = document.styleSheets[0].cssRules;
console.log(myRules[0].layerName); // returns `"layer-1"`
console.log(myRules[1].layerName); // returns `""` (an anonymous layer)
console.log(myRules[2].layerName); // returns `null`