Firefox returns empty computed value in getComputedStyle function

When I use getComputedStyle on an element that has defined properties for left, right, and bottom,

I noticed that Chrome returns 'auto' as the value for top, whereas Firefox returns the pixel value. However, interestingly, the top value does not show up in the computed pane when inspected in Firefox.

Is there a workaround for this discrepancy? Check out this fiddle to see the issue: http://jsfiddle.net/DEfusion/9NaGD/

Answer №1

Found at: https://developer.mozilla.org/en/docs/Web/API/window.getComputedStyle

When using Firefox, keep in mind that properties set to 'auto' will return the used value, not the initial 'auto' value. For example, if you have top:auto; and bottom:0; applied to an element with height:30px within a containing block of height:100px;, when requesting the computed style for top, Firefox will return top:70px, calculated as 100px - 30px = 70px.

Answer №2

Although this question has been asked before, I recently encountered the same issue and found a solution. As pointed out by Prisoner, Firefox handles certain properties differently by returning the used value instead of the resolved value (such as transforming 'auto' to pixels). Luckily, starting from Firefox 19, there is a method called getDefaultComputedStyle that specifically addresses this discrepancy and provides the resolved values.

One approach to tackling this issue is to check for the browser type and utilize getDefaultComputedStyle if using Firefox, otherwise fallback to getComputedStyle.

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