Default styles for h1 elements are changing | MDN Blog

Browsers are starting to roll out changes in default UA styles for nested section headings. Developers should check that their sites don't rely on UA styles for certain cases to avoid unexpected results and failing Lighthouse checks. In this post, we'll have a look at what the incoming changes are, how to identify if it's an issue on your pages, and some hints for conformant and better-structured

[soratomo]

記事詳細ページとかだと、h1 を article 内へ入れ子にしてきたサイトあるので、けっこう注意しないとあかんっぽいな

[efcl]

セクションに基づいた暗黙的な`<h1>`要素のデフォルトのスタイル(UAのスタイル)が変更される。 Firefox 138、Chrome 136以降にこの変更が含まれる