In Chrome, the computed style of background-position is returned as 0% 0%

Let's say I have an element and I am interested in finding out its background-position:

To achieve this, I use the following code snippet:

window.getComputedStyle(element).getPropertyValue('background-position')

If the value of background-position is not explicitly defined for that element, the result would be:

0% 0%

However, if I were to set the background-position to 0% 0%, the returned result would still be the same.

So, how can I differentiate between these two scenarios? How can I determine whether the attribute is truly defined or not?

EDIT:

Some may suggest using 

style.getPropertyValue('background-position')
, but this approach only considers inline values. What I'm looking for is a way to also take into account whether the value has been specified in an external CSS file. http://dev.w3.org/csswg/cssom/#elementcssinlinestyle

javascripthtmlcss

Answer №1

The value calculated is accurate as 0% 0% serves as the default for background-position. (CSS properties always have a defined value – even if it's just the initial one – so they are never truly "undefined".)

getComputedStyle may not be able to distinguish between them, but could assume that background-position 0% 0% with background-image none might indicate the default value.

To track down the source of styles, consider using the unofficial getMatchedCSSRules() method (see window.getComputedStyle(): How to Discard properties with default values?).

Answer №2

In my opinion, the distinguishing factor between these two scenarios lies in the initial css parsing done by the browser. This entails examining the css code on a string level to ascertain whether certain properties have been defined or not. Specifically, one would need to look for occurrences of 'background' and 'background-position' as substrings, and then determine if they are set to 0 or 0%.

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