請嘗試輸入以下XHTML代碼并在IE中瀏覽：

hello ，你會發現只能看到前面的hello而不見后面的world，這事情讓人挺無法解釋的吧。可能有不少人都曾經遇到過這個問題，并且花了幾個小時在上面都找不到合理的解釋。

解釋源自另外一段類似的代碼：

hello world</p></FONT></CODE>，你在IE中看看其顯示效果，能夠得到合理的解釋了嗎？我們能夠看到前面的hello正常顯示了，而后面的world則顯示在textarea里面，這證明IE并沒有正確識別textarea標簽已經自關閉了，而是當它沒有關閉，并將后面的內容識別為textarea內部的內容。</P> <P>這時候我們就明白前面那段代碼為什么看不到后面的world了，因為它被當作script的一部分來識別了。這就說明了，在我們使用XHTML時并不能好像XML那樣隨意的使用自關閉的寫法，只有少數原本不需要關閉的標簽可以用自關閉的寫法，其他標簽即使沒有任何內容最好也用成對的關閉寫法。</P> <P>最后需要提醒大家的是，其實弱智的parser不僅僅IE有，很多地方都可能碰到由于parser不嚴謹而引起的問題，所以我們在書寫XHTML的時候還是要遷就一些老HTML繼承下來的習慣，不能好像真的XML那樣自以為符合標準了就隨意寫。不信？那么再試一個吧：<CODE><FONT face=新宋體 size=3><p>hello <br></br> world</p></FONT></CODE>，留意IE與Opera中的顯示效果。</P> <P>Update: 有部分讀者認為我舉的例子是不符合XHTML規范的，那么請先閱讀<FONT color=#1d58d1>XHTML規范</FONT>。<FONT color=#1d58d1>Empty Elements</FONT>一節的中文翻譯如下：“空元素必須要么有一個結束標記，要么以/>結束，例如<br/>或<hr></hr>。請參考<FONT color=#1d58d1>HTML兼容性標準</FONT>以獲取關于確保向后兼容HTML4瀏覽器的信息。”可以看得到，規范中也給出了<hr></hr>這樣的例子，說明<br></br>的寫法是符合XHTML規范的，只是沒有兼容HTML4標準。那么到底XHTML是否兼容HTML4呢？我們來看<FONT color=#1d58d1>Compatibility Issues</FONT>一節，中文翻譯如下：“雖然并沒有要求XHTML1.0文檔兼容現有的瀏覽器，但在實踐中這并不難做到。”因此，XHTML是沒有規定文檔必須向下兼容，我給出的例子都是合法的XHTML文檔片斷，當出現在完整的XHTML里面時也全部能通過<FONT color=#1d58d1>W3C Markup Validation Service</FONT>的驗證。</P> <P>Update again: 其實我寫這篇文章的目的不是為了強調只符合XHTML規范就行了，也不是強調符合XHTML同時兼容HTML4就夠了，而是應該考慮更多需要兼容的情況。例如你的CMS中允許用戶提交HTML，提交的HTML經過SgmlReader或者其他方法格式化為XHTML，同時或許還做了其它XML處理，這時候就有可能將用戶提交的<textarea>轉換為，這種情況下你需要通過跟蹤調試找出問題并不容易，因為XML處理并沒有違反任何規范，每一步的處理都是符合語義的。另外最好不要把<br />寫成<br/>，因為確實有些弱智的parser僅僅因為少了一個空格就無法正確識別。 </p><p><script type="text/javascript" src="https://jss.51dongshi.com/pcwz/dysph.js"></script><p><strong>聲明：本網頁內容旨在傳播知識，若有侵權等問題請及時與本網聯系，我們將在第一時間刪除處理。TEL:177 7030 7066 E-MAIL:11247931@qq.com</strong></p></div> <div id="rbxvfvtxz7v" class="downbox clearfix"> <div id="rbxvfvtxz7v" class="ico"><img src="https://js.51dongshi.com/tpl/pc2/images/document.png" alt="文檔"></div> <div id="rbxvfvtxz7v" class="txt"> <h4>XHTML標簽的自關閉寫法的壞處分析_經驗交流</h4> <div id="rbxvfvtxz7v" class="co">XHTML標簽的自關閉寫法的壞處分析_經驗交流:如果你熟悉XML相關的開發，可能也就習慣于這種寫法，想著XML中任何不含子節點的元素都可以這樣寫，那么XHTML中沒有內容的標簽也都可以這樣寫。XHTML中理論上當然允許任何標簽以自關閉的方法來書寫，然而瀏覽器兼容性卻帶來了新問題，那就是IE無法正確識別某</div> <div id="rbxvfvtxz7v" class="tj"><b>推薦度：</b><div id="rbxvfvtxz7v" class="tj_stars_list"><i class="tj_stars tj_05"></i></div></div> </div> <div id="rbxvfvtxz7v" class="btn"> <a href="javascript:;" class="html2word" data-model="article" data-id="adcaha" title="文檔下載"> <b>點擊下載本文</b> <span>文檔為doc格式</span> </a> </div> </div> <script>keji_detail_ga('article_content_bottom');</script> <div id="rbxvfvtxz7v" class="tvideo_tag"> 標簽： <a href="/tlist-13/">標簽</a> <a href="/tlist-4572/">的標簽</a> <a href="/tlist-11367/">標記</a> </div> <div id="rbxvfvtxz7v" class="tvideo_box tvideo_box_tab"> <div id="rbxvfvtxz7v" class="hd"> <ul><li id="rbxvfvtxz7v" class="on">熱門焦點</li><script>keji_detail_ga('hot_jiaodian_tab_title');</script></ul> </div> <div id="rbxvfvtxz7v" class="bd"> <ul class="ult_jpic clearfix"> <script>get_hot_jiaodian_content('wz_hot_jiaodian',33,'hot',1);</script> </ul> </div> </div> </div> <!--中間文章 end--> <!--右側專題 star--> <div id="rbxvfvtxz7v" class="ult_zt"> <script>keji_detail_ga('article_right_top');</script> <div id="rbxvfvtxz7v" class="ult_ztbox"> <h4>最新推薦</h4> <ul class="tvideo_r_a clearfix"> <script>get_detail_right('wz_right_new',33,'')</script> </ul> </div> <script>keji_detail_ga('article_right_middle');</script> <div id="rbxvfvtxz7v" class="ult_ztbox"> <h4>猜你喜歡</h4> <ul class="telist_rb clearfix"> <script>get_detail_right('wz_right_love',33,'')</script> </ul> </div> <script>keji_detail_ga('article_right_new_bottom');</script> <div id="rbxvfvtxz7v" class="ult_ztbox"> <h4>熱門推薦</h4> <ul class="tvideo_r_b clearfix"> <script>get_detail_right('wz_right_hot',33,'')</script> </ul> </div> <script>keji_detail_ga('article_right_bottom');</script> </div> <!--右側專題 end--> <div style="display:none"><a href="http://m.glucoside.cn/wzztf/ad/adcaha/">專題</a> </div> </div> </div> <script src="https://js.51dongshi.com/plug/qrcode/qrcode.min.js"></script> <script src="https://js.51dongshi.com/js/share.js" charset="UTF-8"></script> <script type="text/javascript" src="https://js.51dongshi.com/tpl/pc2/js/waypoints.min.js"></script> <script type="text/javascript" src="https://js.51dongshi.com/tpl/pc2/js/icon_step.js"></script> <style> #qrcode{padding: 15px;background: #fff;} </style> <div class="rbxvfvtxz7v" id="qrcode" style="display: none"></div> <script>new QRCode(document.getElementById("qrcode"), "https://m.51dongshi.com/eedfadcaha.html");</script> <iframe src="https://hits.51dongshi.com/?biao=ho_article&id=928959" border="0" frameborder="0" style="width: 0px; 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