[CSS21] Spaces, non-breaking spaces, ideographic spaces and the word-spacing property

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Per CSS 2.1 [1],

"Word spacing affects each space (U+0020), non-breaking space (U+00A0), and ideographic space (U+3000) left in the text after the white space processing rules have been applied."

The simple test case below shows current implementations disagreeing on which type of space word-spacing applies to. I just want to confirm the property does apply to all three spaces.

<!doctype html>
<html>
<head>
   <style type="text/css">
        div { word-spacing: 100px; }
   </style>
</head>
<body>
        <p>Test passes if space between Xs is the same on each line</p>
        <div id="testDiv">X&#12288;X</div>
        <div id="testDiv">X&nbsp;X</div>
        <div id="testDiv">X X</div>
</body>
</html>

[1] http://www.w3.org/TR/CSS21/text.html#propdef-word-spacing