[Webkit-unassigned] [Bug 130902] New: Web Inspector: ER: screen ruler with relative units (CSS px and rem to start)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=130902

           Summary: Web Inspector: ER: screen ruler with relative units
                    (CSS px and rem to start)
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P4
         Component: Web Inspector
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jcraig at apple.com
                CC: timothy at apple.com, joepeck at webkit.org,
                    webkit-bug-importer at group.apple.com,
                    graouts at webkit.org


A physical EM ruler was requested as a joke on Twitter [1], but I believe a relative unit screen ruler would be both achievable and useful in the Web Inspector. 

PX and REM units would be very useful and easier to implement as a 1.0 version of the enhancement. EM and % would also be possible, but the UI may be difficult to get right; would you use the relative unit of the element under the mouse? Selected in the inspector? Both? Displaying EMs and % may be especially confusing for inexperienced CSS authors that don't understand they are multipliers of the ancestor nodes' font sizes. In any case, PX and REM seem like a good start.

1. https://twitter.com/harryharrold/status/449556995277074432

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