Spelling and grammar text decorations

The text-decoration-line: spelling-error and text-decoration-line: grammar-error CSS declarations apply the browser's marking for spelling and grammatical mistakes. This is typically a wavy underline in red or green.

Baseline Status: Achieved Newly Available on Dec 12, 2025 across core engines.

Desktop Browser Engine Support

Google Chrome

121

Supported

Mozilla Firefox

137

Supported

Apple Safari

26.2

Supported

Microsoft Edge

121

Supported

Mobile Browser Engine Support

Chrome Android

121

Firefox Android

137

Safari iOS

26.2

Specifications and References

Specification ↗ Feature XML ↗

MDN Browser Compat Data Keys:

css.properties.text-decoration-line.grammar-error ↗ css.properties.text-decoration-line.spelling-error ↗