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我使用的是Piwigo相冊軟件，並動態生成的頁面頭部的一些代碼，它顯示是這樣的：驗證：壞值首先爲屬性的rel元素鏈接
<link rel="first" title="First" href="picture.php?/2601/category/37">
<link rel="prev" title="Previous" href="picture.php?/2619/category/37">
<link rel="next" title="Next" href="picture.php?/2621/category/37">
<link rel="last" title="Last" href="picture.php?/2760/category/37">
<link rel="up" title="Thumbnails" href="index.php?/category/37">
當我運行它通過驗證，我得到的錯誤如下：
Line 21, Column 71: Bad value first for attribute rel on element link: The string first is not a registered keyword or absolute URL.
…" href="picture.php?/2601/category/37"> <link rel="prev" title="Previous" hre…
Line 21, Column 282: Bad value last for attribute rel on element link: The string last is not a registered keyword or absolute URL.
…" href="picture.php?/2760/category/37"> <link rel="up" title="Thumbnails" hre…
Line 21, Column 348: Bad value up for attribute rel on element link: The string up is not a registered keyword or absolute URL.
…category/37"> <link rel="up" title="Thumbnails" href="index.php?/category/37">
一些閱讀後，我認識到，HTML5已經刪除了版本，第一個和最後，雖然它保留了prev和next。我不明白的是什麼來替代，首先和下一個？如果我完全刪除它們，驗證器也不滿意。
有誰知道嗎？謝謝。 :)