[請益] 語法請教
請教一下
有很多網頁都會加以下語法
想請問是什麼效果和作用
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"" rel="nofollow">http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="" rel="nofollow">http://www.w3.org/1999/xhtml"><head>
感謝回答囉
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