This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The ::grammar-error CSS pseudo-element represents a text segment which the user agent has flagged as grammatically incorrect.

Allowable properties

Only a small subset of CSS properties can be used in a rule with ::grammar-error in its selector:




Simple document grammar check

In this example, eventual supporting browsers should highlight any flagged grammatical errors with the styles shown.


<p>My friends is coming to the party tonight.</p>


::grammar-error  {
  text-decoration: underline red;
  color: red;



Specification Status Comment
CSS Pseudo-Elements Level 4
The definition of '::grammar-error' in that specification.
Working Draft Initial definition.

Browser compatibility

ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
::grammar-errorChrome No support NoEdge No support NoFirefox No support NoIE No support NoOpera No support NoSafari No support NoWebView Android No support NoChrome Android No support NoFirefox Android No support NoOpera Android No support NoSafari iOS No support NoSamsung Internet Android No support No


No support
No support

See also