1122852 - Dev Tools Inspector: CSS Rules Tab should not show length unit `px` when no length unit is given

Status: RESOLVED DUPLICATE of bug 715888

(DevTools :: Inspector, defect)

Description

[Volker E.]

Attachment: firefox-developer-tools_v34_length_unit_value_0_display_test.html

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0
Build ID: 20141125180439

Steps to reproduce:

When setting a CSS length value to `0`, Firefox Developer Tools shows it in the Rules Tab as `0px`. Even if all other values in the same property are of a different length value like `5rem`.



Expected results:

As there is no default length unit from standards perspective, `px` should not be added to `0` values. Also mixing `px` into values of properties with different lenth unit confuses.

Citing from http://www.w3.org/TR/css3-values/#lengths
>> However, for zero lengths the unit identifier is optional (i.e. can be syntactically represented as the <number> ‘0’). 

In my opinion adding it also gives the wrong perception that a length unit is necessary, which at very large projects with several hundred lines of CSS code would even lead to a difference size-wise.

Comment 1

[Tom Tromey :tromey]

Dup of another bug; part of the as-authored project.