Update jsdom 27.2.0 → 28.0.0 (major)

[depfu]

Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ jsdom (27.2.0 → 28.0.0) · Repo · Changelog

Release Notes

28.0.0

• Overhauled resource loading customization. See the new README for details on the new API.
• Added MIME type sniffing to <iframe> and <frame> loads.
• Regression: WebSockets are no longer correctly throttled to one connection per origin. This is a result of the bug at nodejs/undici#4743.
• Fixed decoding of the query components of <a> and <area> elements in non-UTF-8 documents.
• Fixed XMLHttpRequest fetches and WebSocket upgrade requests to be interceptable by the new customizable resource loading. (Except synchronous XMLHttpRequests.)
• Fixed the referrer of a document to be set correctly when redirects are involved; it is now the initiating page, not the last hop in the redirect chain.
• Fixed correctness bugs when passing ArrayBuffers or typed arrays to various APIs, where they would not correctly snapshot the data.
• Fixed require("url").parse() deprecation warning when using WebSockets.
• Fixed <iframe>, <frame>, and <img> (when canvas is installed) to fire load events, not error events, on non-OK HTTP responses.
• Fixed many small issues in XMLHttpRequest.

27.4.0

• Added TextEncoder and TextDecoder.
• Improved decoding of HTML bytes by using the new @exodus/bytes package; it is now much more correct. (ChALkeR)
• Improved decoding of XML bytes to use UTF-8 more often, instead of sniffing for <meta charset> or using the parent frame's encoding.
• Fixed a memory leak when Ranges were used and then the elements referred to by those ranges were removed.

27.3.0

• Improved CSS parsing and CSSOM object APIs via updates to @acemir/cssom. (acemir)

Does any of this look wrong? Please let us know.

Commits

See the full diff on Github. The new version differs by 50 commits:

• Version 28.0.0
• Replace the resource loader API
• Decode <a> and <area> query strings using document's encoding
• Add AGENTS.md (and CLAUDE.md)
• Mark header-values tests as fail-slow due to Node.js bug
• Update dependencies and dev dependencies
• Improve spec alignment of Headers and header type tests
• Fix Windows-specific task kill timeouts
• Add failing regression test for animation-name case-sensitivity
• Update style benchmark
• Update whatwg-mimetype, data-urls, and @exodus/bytes
• Improve fetch header infrastructure and use it in XHR
• Load non-2xx responses for frames and images
• Cleanup stray servers on test shutdown
• Remove require("url").parse() usage
• Remove Buffer usage elsewhere
• Add an encoding.js wrapper for UTF-8 handling
• Improve bytes-related internal names and documentation
• Remove Buffer usage in WebSocket
• Remove Buffer usage in XHR
• Remove Buffer usage in Blob/FileReader
• Minor README cleanups
• Disable flaky Range-mutations-dataChange.html
• Add regression test for getComputedStyle respecting !important priority
• Add regression test for getComputedStyle respecting CSS specificity
• Add regression test for calc() expressions with parentheses
• Add regression test for getComputedStyle with CSS variables on :root
• Add regression test for getComputedStyle not returning pseudo-class styles
• Add regression test for multiple background-images in getComputedStyle
• Add regression test for basic supports rule parsing
• Add regression test for insertRule with font-face rule
• Add regression test for class selector with escaped exclamation mark
• Add regression test for nested media queries
• Add regression test for nested media queries in layer with CSS Nesting
• Update dependencies and dev dependencies
• Enable characterSet normalization WPTs
• Add css/css-backgrounds to WPTs we run
• Add regression test for negative box inset CSS
• Remove workaround for now-fixed CSS parsing issue
• Add another setProperty() regression test
• Add style performance benchmark
• Version 27.4.0
• Improve asciiLowercase/asciiUppercase performance
• Implement TextEncoder and TextDecoder; improve XML decoding
• Switch from iconv-lite to exodus/bytes for decoding
• Use weak references for ranges
• Add currently-failing CSS regression tests
• Version 27.3.0
• Update dependencies and dev dependencies
• CSSOM improvements

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