The specification is here: https://svgwg.org/specs/paths/#DOMInterfaces

https://treeherder.mozilla.org/jobs?repo=try&revision=c38083ed911c75ffb37a7a03507fe2ddd45d2b47

https://groups.google.com/a/mozilla.org/g/dev-platform/c/i-F57-F7--4

Once this lands, it should be documented at https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Experimental_features. Reading the attached patch, the related pref is dom.svg.pathSegment.enabled and enabled by default in Nightly builds.

Sebastian

https://treeherder.mozilla.org/jobs?repo=try&revision=00e05db53ac1af4ef807979608c6bb88630e77e6

https://treeherder.mozilla.org/jobs?repo=try&revision=a9177058206dda9f03f90d9f4e1d0efac7e6872b

https://treeherder.mozilla.org/jobs?repo=try&revision=69d7a6e6b365f2bd981d0ce6db225489c3449788

https://hg.mozilla.org/mozilla-central/rev/99281d5df65b

Release Note Request (optional, but appreciated)
[Why is this notable]:
[Affects Firefox for Android]: yes
[Suggested wording]: Firefox has an implementation of the new SVG 2 path API. Currently enabled on nightly only but there will be a pref dom.svg.pathSegment.enabled that you can enable from Firefox 136.
[Links (documentation, blog post, etc)]:
https://svgwg.org/specs/paths/#DOMInterfaces
https://github.com/jarek-foksa/path-data-polyfill (polyfill for browsers that don't have a native implementation)
https://stackoverflow.com/questions/34919405

Added to the Fx136 nightly release notes, please allow 30 minutes for the site to update.

I am probably missing something here, but when I test the example above I am just getting the error: SVGPathSegment is not defined.
I have tested this in:

• Firefox Nightly 137.0a1
• Firefox Beta 136.0 with the flag dom.svg.pathSegment.enabled set to true

removing nightly+ relnote flag since this will be in the 137 release notes via bug 1945312

(In reply to Dave Letorey from comment #18)

I am probably missing something here, but when I test the example above I am just getting the error: SVGPathSegment is not defined.
I have tested this in:

• Firefox Nightly 137.0a1
• Firefox Beta 136.0 with the flag dom.svg.pathSegment.enabled set to true

I've replaced the testcase. The previous one was what I started with for development but in the end I discovered it isn't actually valid as the SVGPathSegment type doesn't have a javascript interface according to https://svgwg.org/specs/paths/#DOMInterfaces