Blogger Josh Comeau lists top 10 CSS picks for Interop 2027
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The gist
Blog author Josh Comeau published his top 10 CSS feature picks for Interop 2027.
Interop has pushed features like Subgrid to near-universal browser support within a year.
Background
Josh Comeau is the author of a blog post titled "The Future of CSS," in which he lists his top 10 picks for Interop 2027. Interop is a project in which major browser vendors — Google, Apple, Microsoft and Mozilla, along with Igalia and Boucoup — work together to improve universal browser support for web technologies. As 2026 ends and Interop 2027 is being planned, Mozilla has created a ranking system that lets people upvote their most-requested features, and says it plans to use that data to decide what to include.
How it unfolded
- 2019CSS Subgrid was implemented in Firefox.
- 2023Subgrid was added to Interop 2023; by the end of that year it was widely available across all modern browsers.
- October 2026CSS functions and corner-shape were supported in Chrome 155 and Edge 154, but not in Firefox 157 or Safari 27.
- Oct 20, 2026Josh Comeau published "The Future of CSS," his top 10 picks for Interop 2027.
Who’s saying what
- Analysts
- Comeau calls Interop a remarkably successful effort, noting that a focus area often reaches near-100% support across major browsers within a year.
- Expert
- Comeau says that if CSS functions are added to Interop 2027, there are very good odds they could become widely available sooner rather than later.
- Official
- Mozilla created a ranking system for upvoting most-requested features and plans to use the ranking data to decide what to include for next year's Interop.
Still unverified
Whether CSS functions will be added to Interop 2027 is not decided; Comeau says the feature is "already implemented in Chromium browsers" and hopes it gets added.