For the Color Square, up/down/left/right keys should move the "crosshair". For the hue and opacity sliders: - Pressing up and down keys should adjust the value by 1%. - When holding Shift, up and down keys adjust the value by 10%.
<rdar://problem/58169943>
Created attachment 386363 [details] Patch
Comment on attachment 386363 [details] Patch r=me, with one issue. Whenever I use arrows, I get the Bonking noise (InspectorFrontendHost.beep()?) that happens when the default event handler runs. So I think you need to call .preventDefault() on the event after handling it.
Created attachment 386882 [details] Pach
Comment on attachment 386882 [details] Pach Clearing flags on attachment: 386882 Committed r254094: <https://trac.webkit.org/changeset/254094>
All reviewed patches have been landed. Closing bug.