Published: September 3, 2026
Interop 2027 launches today! As in previous years, the project begins with a call for proposals. This is your chance to tell us which web platform features you would love to see included in the project next year. When the proposal period ends on September 23rd all features will be considered according to this process.
What makes a good project proposal?
The Interop project aims to take things that have already been through the standards process, and make them interoperable. Therefore, the first thing to consider is whether your idea has a stable specification, and no outstanding objections from one or more browser vendors. Past features have typically been implemented in at least one browser before becoming part of the project.
Features that have a stable implementation should also have the other thing that's needed for a successful proposal—a good test suite. The success of a feature in the project is based on browsers passing these tests, so we need to know that there are enough tests in the first place.
Find out more information by reading the Proposal Guide. This guide includes some additional signals that can help to boost the chances of your proposal succeeding.
Inspiration for 2027
As we head towards the end of the third quarter of the year, there's been great progress on the accepted proposals for Interop 2026. In fact, all browsers are in a much stronger position than at the same time last year, in terms of progress to 100%.
As we explained at the beginning of 2026, many of the features this year showed up as top features mentioned in developer surveys such as The State of CSS, or were in the top 20 in the developer signals repository.
Use webstatus.dev to identify features that meet the requirements for good proposals, and check out the developer signals repository to see if there are any published use cases to help support your case.
Help make 2027 a success
Even if you don't have a feature to propose, keep an eye on the growing list of proposals and like and comment on the submissions you think are most important. Share the call for proposals on social media, and in any developer communities you are part of, and help us to make the web more interoperable once again!