This would be especially useful when element selection is started from the develop menu (⇧⌘C), instead of from the Web Inspector UI.
Created attachment 370488 [details] Patch
I'm on the fence about this. If a developer hates rulers, they would be turned off by this. Maybe a setting in in order for this behavior?
Created attachment 370535 [details] Patch Added a setting that is enabled by default :)
Created attachment 370536 [details] Patch Rebase
This patch modifies the inspector protocol. Please ensure that any frontend changes appropriately use feature checks for new protocol features.
Comment on attachment 370536 [details] Patch Clearing flags on attachment: 370536 Committed r245730: <https://trac.webkit.org/changeset/245730>
All reviewed patches have been landed. Closing bug.
<rdar://problem/51091474>