https://html.spec.whatwg.org/multipage/input.html#dom-input-stepup
Created attachment 450889 [details] Patch
Created attachment 451040 [details] Patch
Comment on attachment 451040 [details] Patch r=me
Committed r289465 (247008@main): <https://commits.webkit.org/247008@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 451040 [details].
<rdar://problem/88680257>