W3C 的 HTML Markup Validator 是否對於《SEO/關鍵字排名》提升有幫助？

W3C Markup Validation Service 是否對於您網頁的排名有幫助，這個問題個人的看法是==> 幫助有限。 個人意見如下:
網頁是給目標使用者看的，不是做來給 W3C Validator 看的。
你注重的是網頁的內容，而非百分之百格式的標準。
Validator 能夠給您保證的，是您 markup language 《文法的正確性》，而非使用者或搜尋引擎的感受。
您可以試試看下面這幾家的網頁:
Google HTML/Markup Validation
Yahoo! HTML/Markup Validation
Microsoft HTML/Markup Validation
Apple HTML/Markup Validation
Adobe HTML/Markup Validation
也有很標準的網頁, 2006/11/05 檢查時都很標準(剛好一個 Server Side，一個 Client Side)
Apache-Httpd HTML/Markup Validation
Mozilla HTML/Markup Validation
當然，如果您有空將您的出版系統調整至可產生符合 W3C 標準的網頁，那當然在好也不過。
最低最低限度是 "不要連瀏覽器與一般使用者，都認為你的網頁有問題(Errors)！"
讓您的網頁在瀏覽器 Internet Explorer 和 Mozillia Firefox 都能夠無問題瀏覽便已經有一定保證。 這一段是從 W3C Validator FAQ 擷取的，當然他們是鼓勵每一個電子出版頁面都符合其 Markup Lang 語法。供您參考: Why should I validate my HTML pages? One of the important maxims of computer programming is: Be conservative in what you produce; be liberal in what you accept. Browsers follow the second half of this maxim by accepting Web pages and trying to display them even if they're not legal HTML. Usually this means that the browser will try to make educated guesses about what you probably meant. The problem is that different browsers (or even different versions of the same browser) will make different guesses about the same illegal construct; worse, if your HTML is really pathological, the browser could get hopelessly confused and produce a mangled mess, or even crash. That's why you want to follow the first half of the maxim by making sure your pages are legal HTML. The best way to do that is by running your documents through one or more HTML validators.