::grammar-error
Experimental: 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:
colorbackground-colorcursorcaret-color- 
outlineand its longhands - 
text-decorationand its associated properties text-emphasis-colortext-shadow
Syntax
::grammar-error
Examples
Simple document grammar check
In this example, eventual supporting browsers should highlight any flagged grammatical errors with the styles shown.
HTML
<p>My friends is coming to the party tonight.</p>
CSS
::grammar-error { text-decoration: underline red; color: red; }
Result
Specifications
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 | |
::grammar-error | 
No  | 
No  | 
No  | 
No  | 
No  | 
 No 
See bug 175784. 
 | 
No  | 
No  | 
No  | 
No  | 
No  | 
No  | 
See also
    © 2005–2021 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
    https://developer.mozilla.org/en-US/docs/Web/CSS/::grammar-error