# jsdom: what changed from 29 to 30

- Product: jsdom (https://whatsnew.fyi/product/jsdom)
- Vendor: jsdom
- Range: changelog entries numbered after v29.1.1 up to and including v30.0.1, stable releases only
- Entries below: 2 releases (newest first)
- Resolved: 29 is v29.1.1 and 30 is v30.0.1, the newest stable release of each major we track
- Carrying security changes: 0 · CVEs mentioned: 0 · Mentioning breaking changes: 1 · Removing or deprecating something: 1
- Page: https://whatsnew.fyi/product/jsdom/compare/29...30

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

## What changed (8 changes, grouped by kind)

### Added

#### v30.0.0 (2026-07-27)

- Add CSS.escape() and CSS.supports() functions
- Add 'background-position-x' and 'background-position-y' CSS properties

### Changed

#### v30.0.1 (2026-07-29)

- Sped up range operations on large documents

### Fixed

#### v30.0.1 (2026-07-29)

- getComputedStyle() with calc() and other functions throwing an exception, which regressed in v30.0.0

#### v30.0.0 (2026-07-27)

- Fix getComputedStyle() to convert length values into pixels
- Fix CSS function serialization in the return value of getPropertyValue()
- Fix the type of error thrown by document.evaluate()

### Removed

#### v30.0.0 (2026-07-27)

- Raise Node.js minimum version to ^22.22.2 || ^24.15.0 || >=26.0.0

## Release notes

### v30.0.1

- Date: 2026-07-29
- Version: v30.0.1
- Original notes: https://github.com/jsdom/jsdom/releases/tag/v30.0.1
- Permalink: https://whatsnew.fyi/product/jsdom/releases/v30.0.1

- **fixed** — getComputedStyle() with calc() and other functions throwing an exception, which regressed in v30.0.0
- **changed** — Sped up range operations on large documents

* Fixed `getComputedStyle()` with `calc()` and other functions throwing an exception, which regressed in v30.0.0. (@asamuzaK)
* Sped up up range operations on large documents (@leonidaz)

### v30.0.0

- Date: 2026-07-27
- Version: v30.0.0
- Original notes: https://github.com/jsdom/jsdom/releases/tag/v30.0.0
- Permalink: https://whatsnew.fyi/product/jsdom/releases/v30.0.0

- **removed** — Raise Node.js minimum version to ^22.22.2 || ^24.15.0 || >=26.0.0
- **added** — Add CSS.escape() and CSS.supports() functions
- **added** — Add 'background-position-x' and 'background-position-y' CSS properties
- **fixed** — Fix getComputedStyle() to convert length values into pixels
- **fixed** — Fix CSS function serialization in the return value of getPropertyValue()
- **fixed** — Fix the type of error thrown by document.evaluate()

Breaking changes:

- Node.js minimum version raised to `^22.22.2 || ^24.15.0 || >=26.0.0`.

Other changes:

* Added `CSS.escape()` and `CSS.supports()` functions. (@asamuzaK)
* Added `'background-position-x'` and `'background-position-y'` CSS properties. (@olagokemills)
* Fixed `getComputedStyle()` to convert length values into pixels. (@asamuzaK)
* Fixed CSS function serialization, e.g., in the return value of `getPropertyValue()`. (@asamuzaK)
* Fixed the type of error thrown by `document.evaluate()` (@dokson)