[csswg-drafts] [css-2025][css-text-decor-4] Add `text-decoration-thickness`, `text-underline-offset` properties and `from-font` value for `text-underline-position` to Safe to Release exceptions (#12779)

SebastianZ has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-2025][css-text-decor-4] Add `text-decoration-thickness`, `text-underline-offset` properties and `from-font` value for `text-underline-position` to Safe to Release exceptions ==
Splitting the discussion from #10687 for adding the [`text-decoration-thickness`](https://drafts.csswg.org/css-text-decor-4/#text-decoration-thickness-property), [`text-underline-offset`](https://drafts.csswg.org/css-text-decor-4/#underline-offset) properties and [`from-font` value for `text-underline-position`](https://drafts.csswg.org/css-text-decor-4/#valdef-text-underline-position-from-font) from [CSS Text Decorations 4](https://drafts.csswg.org/css-text-decor-4/) to the Safe to Release pre-CR Exceptions section of the CSS Snapshot 2025.

Data to consider:

* Spec. status: WD (last published: 4 May 2022)
* Implemented in all major browsers [since 2021](https://developer.mozilla.org/en-US/docs/Web/CSS/text-decoration-thickness) and earlier
* see also https://github.com/w3c/csswg-drafts/issues/6729
* [WPT](https://wpt.fyi/results/css/css-text-decor?label=master&label=experimental&aligned&q=text-decoration-thickness%20or%20from-font): passing tests (experimental): Chrome: 228, Edge: 228, Firefox: 345, Safari: 179; [interop between Chrome, Edge, and Firefox](https://wpt.fyi/results/css/css-text-decor?label=master&label=stable&product=chrome&product=edge&product=firefox&aligned&q=chrome%3Apass%20edge%3Apass%20firefox%3Apass%20text-decoration-thickness%20or%20from-font): 228 / 345 (66.1%)
* Open issues: [on GitHub](https://github.com/w3c/csswg-drafts/issues?q=is%3Aopen+is%3Aissue+label%3Acss-text-decor-4+"text-decoration-thickness"+"from-font"): 2, [in spec.](https://drafts.csswg.org/css-text-decor-4/#issues-index): 1

Summary: Widely implemented, low interoperability, few open issues

Sebastian

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/12779 using your GitHub account


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Received on Thursday, 11 September 2025 11:24:04 UTC