889091 - getComputedStyle does not provide aggregate styles for border, background etc.

Status: RESOLVED DUPLICATE of bug 137688

(Core :: DOM: CSS Object Model, defect)

Description

[Amit Ambardekar]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:25.0) Gecko/20130701 Firefox/25.0 (Nightly/Aurora)
Build ID: 20130701031115

Steps to reproduce:

1. Create an HTML page with with an element(div#d1) having some styles
#d1{
  background:Red;border:1px solid #444;
}
2. Check for computed style properties background and border for the element using getComputedStyle

http://jsbin.com/izocaj/6/edit


Actual results:

getComputedStyle returned with stylesheet object having blank values for background and border
Only constituent values of styles got set i.e. backgroundColor, borderTopWidth, borderTopColor, borderTopStyle and so on...


Expected results:

background should have aggregate values calculated from all assigned background properties which wold be "rgb(255, 0, 0) none repeat scroll 0% 0% / auto padding-box border-box" here
border should have aggregate value of assigned border values wherever possible and here specifically it should have returned "1px solid rgb(68, 68, 68)" or shouldd set border<direction> property with aggregate values

Comment 1

[Amit Ambardekar]

It works as expected in Chrome 27.0.1453.116

Comment 2

[David Baron :dbaron: (⌚️UTC-5, no longer working on Mozilla)]

I thought the spec required that these be empty, but I can't find any such requirement, so I guess my memory was probably wrong.

Comment 3

[Boris Zbarsky [:bzbarsky]]

Your memory is not quite wrong.  getPropertyCSSValue is required to return null for these, and we implement getPropertyValue in terms of getPropertyCSSValue.