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I think I found a solution for Firefox anyways, thought you might like a follow up: Looking through the source code I found a file: nsCSSParser.cpp For each rgb percentages it does the following: <ol> <li>It takes the percentage component multiplies it by 255.0f</li> <li>Stores it in a float</li> <li>Passes it into a function NSToIntRound</li> <li>The result of NSToIntRound is stored into an 8 bit integer datatype, before it is combined with the other 2 components and an alpha channel</li> </ol> Looking for more detail on NSToIntRound: <pre><code>nsCoord.h inline PRInt32 NSToIntRound(float aValue) { return NS_lroundf(aValue); } </code></pre> NSToIntRound is a wrapper function for NS_lroundf <pre><code>nsMathUtils.h inline NS_HIDDEN_(PRInt32) NS_lroundf(float x) { return x >= 0.0f ? PRInt32(x + 0.5f) : PRInt32(x - 0.5f); } </code></pre> This function is actually very clever, took me a while to decipher (I don't really have a good C++ background). Assuming x is positive It adds 0.5f to x and then casts to an integer If the fractional part of x was less than 0.5, adding 0.5 won't change the integer and the fractional part is truncated, Otherwise the integer value is bumped by 1 and the fractional part is truncated. <ol> <li>So each component's percentage is first multiplied by 255.0f</li> <li>Then Rounded and cast into a 32bit Integer</li> <li>And then Cast again into an 8 bit Integer</li> </ol> I agree with most of you that say this appears to be a browser dependent issue, so I will do some further research on other browsers. Thanks a bunch!
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1. POHow do browsers handle rgb(percentage); for strange numbers
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1. USRay
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