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As of May 2026, XSLT is supported by all standard browsers.

However, there have been developer discussions about whether support for XSLT should be discontinued in future versions of web browsers. There have been security issues in the past because the browser implementation of the XSLT interpretor has been insufficiently updated over the years.

The developers of Chrome, Edge, and Firefox are planning to remove support sometime in 2026 or 2027. I don't believe there will be standard solutions for backwards compatibility with existing implementations, it appears that XSLT will simply stop working.

I started working on the feed style well before the 2025 removal discussions and removing browser support would have a negative impact on this RSS Project that is using styling of RSS feeds as the starting point to imagine an alternative to social media platforms.

So I will have to find a workaround, like use a ready-made XSLT polyfill or add my own JavaScript-based translation of the XML code into an HTML page.