[Webkit-unassigned] [Bug 93445] New: getComputedStyle for `opacity` is not the value specified.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=93445

           Summary: getComputedStyle for `opacity` is not the value
                    specified.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
               URL: javascript: var el = document.body;
                    void(el.style.opacity = '0.95');
                    alert([el.style.opacity,
                    getComputedStyle(el).opacity]);
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: dhtmlkitchen at gmail.com


Reading `opacity` back from `getComputedStyle` results in a value that is not the value specified.

var el = document.body;
el.style.opacity = '0.95'; // Specified value.
el.style.opacity;// Specified value returned.
"0.95" 
getComputedStyle(el).opacity; // Not the specified value.
"0.949999988079071" 

With getComputedStyle(el).opacity, an internal number of the opacity is returned. Is it that '9.5' sets the opacity as a (lossy) binary number, which, when returned, is converted to a string? 

Css3 spec says that the value returned must be "The same as the specified value after clipping the <alphavalue> to the range [0.0,1.0]." 

Since the value returned ("0.949999988079071") is not the specified value ("9.5"), then this is a violation of a spec. 

http://www.w3.org/TR/css3-color/#transparency

| Computed value:     The same as the specified value 
| after clipping the <alphavalue> to the range [0.0,1.0]. 

Version 5.1.1 (6534.51.22)

"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/534.51.22 (KHTML, like Gecko) Version/5.1.1 Safari/534.51.22"

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