NEW130902
Web Inspector: Screen ruler with relative units (CSS px and rem to start) 
https://bugs.webkit.org/show_bug.cgi?id=130902
Summary Web Inspector: Screen ruler with relative units (CSS px and rem to start)
James Craig
Reported 2014-03-28 10:18:22 PDT
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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Radar WebKit Bug Importer
Comment 1 2014-03-28 10:18:45 PDT
<rdar://problem/16458106>
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