Spelling and grammar text decorationsThe 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.newly2025-12-12https://drafts.csswg.org/css-text-decor-4/#valdef-text-decoration-line-spelling-errorhttps://developer.mozilla.org/docs/Web/CSS/Reference/Properties/text-decoration-linecss.properties.text-decoration-line.grammar-errorcss.properties.text-decoration-line.spelling-errorhttps://nowyoucanuse.com/features--text-decoration-spelling-grammar.html