Currently get y and get x return this._x. We should return this._y in get y so there is not a duplicate function in GradientSlider.js.
Pull request: https://github.com/WebKit/WebKit/pull/28478
Created attachment 471391 [details] testcase
Committed 278904@main (5ab59d6891b5): <https://commits.webkit.org/278904@main> Reviewed commits have been landed. Closing PR #28478 and removing active labels.
<rdar://problem/128248166>