/Web APIs

CSSStyleSheet: replace() method

The replace() method of the CSSStyleSheet interface asynchronously replaces the content of the stylesheet with the content passed into it. The method returns a promise that resolves with the CSSStyleSheet object.

The replace() and CSSStyleSheet.replaceSync() methods can only be used on a stylesheet created with the CSSStyleSheet() constructor.





A string containing the style rules to replace the content of the stylesheet. If the string does not contain a parseable list of rules, then the value will be set to an empty string.

Note: If any of the rules passed in text are an external stylesheet imported with the @import rule, those rules will be removed, and a warning printed to the console.

Return value

A Promise that resolves with the CSSStyleSheet.


NotAllowedError DOMException

Thrown if one of these two conditions is met:

  • The stylesheet was not created using the CSSStyleSheet() constructor.
  • The stylesheet is flagged as unmodifiable.


In the following example a new stylesheet is created and two CSS rules are added using replace(). The first rule is then printed to the console, which will return: body { font-size: 1.4em; }

const stylesheet = new CSSStyleSheet();

  .replace("body { font-size: 1.4em; } p { color: red; }")
  .then(() => {
  .catch((err) => {
    console.error("Failed to replace styles:", err);


Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
replace 73 79 101 No 60 16.4 73 73 101 52 16.4 11.0

See also

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