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Update dependency jsdom to v29#1329

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Update dependency jsdom to v29#1329
renovate[bot] wants to merge 1 commit intomasterfrom
renovate/jsdom-29.x

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@renovate renovate bot commented Mar 18, 2026

This PR contains the following updates:

Package Change Age Confidence
jsdom ^27.3.0^29.0.0 age confidence

Release Notes

jsdom/jsdom (jsdom)

v29.0.0

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Breaking changes:

  • Node.js v22.13.0+ is now the minimum supported v22 version (was v22.12.0+).

Other changes:

  • Overhauled the CSSOM implementation, replacing the @acemir/cssom and cssstyle dependencies with fresh internal implementations built on webidl2js wrappers and the css-tree parser. Serialization, parsing, and API behavior is improved in various ways, especially around edge cases.
  • Added CSSCounterStyleRule and CSSNamespaceRule to jsdom Windows.
  • Added cssMediaRule.matches and cssSupportsRule.matches getters.
  • Added proper media query parsing in MediaList, using css-tree instead of naive comma-splitting. Invalid queries become "not all" per spec.
  • Added cssKeyframeRule.keyText getter/setter validation.
  • Added cssStyleRule.selectorText setter validation: invalid selectors are now rejected.
  • Added styleSheet.ownerNode, styleSheet.href, and styleSheet.title.
  • Added bad port blocking per the fetch specification, preventing fetches to commonly-abused ports.
  • Improved Document initialization performance by lazily initializing the CSS selector engine, avoiding ~0.5 ms of overhead per Document. (thypon)
  • Fixed a memory leak when stylesheets were removed from the document.
  • Fixed CSSStyleDeclaration modifications to properly trigger custom element reactions.
  • Fixed nested @media rule parsing.
  • Fixed CSSStyleSheet's "disallow modification" flag not being checked in all mutation methods.
  • Fixed XMLHttpRequest's response getter returning parsed JSON during the LOADING state instead of null.
  • Fixed getComputedStyle() crashing in XHTML documents when stylesheets contained at-rules such as @page or @font-face.
  • Fixed a potential hang in synchronous XMLHttpRequest caused by a race condition with the worker thread's idle timeout.

v28.1.0

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  • Added blob.text(), blob.arrayBuffer(), and blob.bytes() methods.
  • Improved getComputedStyle() to account for CSS specificity when multiple rules apply. (asamuzaK)
  • Improved synchronous XMLHttpRequest performance by using a persistent worker thread, avoiding ~400ms of setup overhead on every synchronous request after the first one.
  • Improved performance of node.getRootNode(), node.isConnected, and event.dispatchEvent() by caching the root node of document-connected trees.
  • Fixed getComputedStyle() to correctly handle !important priority. (asamuzaK)
  • Fixed document.getElementById() to return the first element in tree order when multiple elements share the same ID.
  • Fixed <svg> elements to no longer incorrectly proxy event handlers to the Window.
  • Fixed FileReader event timing and fileReader.result state to more closely follow the spec.
  • Fixed a potential hang when synchronous XMLHttpRequest encountered dispatch errors.
  • Fixed compatibility with environments where Node.js's built-in fetch() has been used before importing jsdom, by working around undici v6/v7 incompatibilities.

v28.0.0

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  • 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.

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.


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This PR was generated by Mend Renovate. View the repository job log.

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
@renovate renovate bot added the dependencies Pull requests that update a dependency file label Mar 18, 2026
@renovate renovate bot requested a review from MihaiTabara as a code owner March 18, 2026 08:32
@renovate renovate bot added the major label Mar 18, 2026
@renovate renovate bot requested a review from a team as a code owner March 18, 2026 08:32
@awanlin
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awanlin commented Mar 19, 2026

Holding off until this is done upstream 👍

@awanlin awanlin closed this Mar 19, 2026
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renovate bot commented Mar 19, 2026

Renovate Ignore Notification

Because you closed this PR without merging, Renovate will ignore this update. You will not get PRs for any future 29.x releases. But if you manually upgrade to 29.x then Renovate will re-enable minor and patch updates automatically.

If you accidentally closed this PR, or if you changed your mind: rename this PR to get a fresh replacement PR.

@renovate renovate bot deleted the renovate/jsdom-29.x branch March 19, 2026 12:38
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