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                        /初識HTML(5)+CSS(3)

為什么這樣不行？我用超過10個標簽選擇器相加。

<DOCTYPE?html>
?<html>
??<head>
???<meta?http-equiv="Content-Type"?content="text/html";?charset="utf-8">
???<title>特殊性</title>
???<style?type="text/css">
????body>p>span>span>span>span>span>span>span>span>span>span>span?{color:green;}
????.ppp?{color:red;}
???</style>
??</head>
??<body>
???<p>
????<span>
?????<span>
??????<span>
???????<span>
????????<span>
?????????<span>
??????????<span>
???????????<span>
????????????<span>
?????????????<span>
??????????????<span?class="ppp">測試</span>
?????????????</span>
????????????</span>
???????????</span>
??????????</span>
?????????</span>
????????</span>
???????</span>
??????</span>
?????</span>
????</span>
???</p>
???
??</body>
?</html>

這十幾個標簽選擇器相加，權值不是應該超過10了嗎？為什么那幾個字還是只能顯示為紅色，而不是顯示為綠色？