Writing forward-compatible websites

  • 版本網址代稱: Web_development/Writing_forward-compatible_websites
  • 版本標題: Writing forward-compatible websites
  • 版本 ID: 19530
  • 建立日期:
  • 建立者: Sonrisa
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解釋如何編寫網站才能在新的瀏覽器版本發布時不被破壞

這對內聯網和其他非公共網站尤其重要,如果我們不能看到你的原始碼,我們不能看到它被破壞它並不總是遵循所有這些,但他們盡可能多的將有助於您的網站往未來發展
 

JavaScript

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Prefix all global variable access in onfoo attributes with “window.”

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當一事件處理程序的內容屬性onclick,onmouseover等等)被使用在HTML的元件上所有的名稱查找屬性中首先發生元素本身,該元素的形式元素是否是窗體控件,然後文件,然後在窗口(其中已定義的全域變數)。例如,如果這樣的標記

<div onclick="alert(ownerDocument)">Click me</div>

然後點擊文本提醒div的ownerDocument。發生這種情況,即使是在全球範圍內宣布一個var ownerDocument

這意思是任何時候你在事件處理程序的內容屬性,包括調用任何全域函數和全域變數,如果一個規範增加了一個新的DOM屬性到具有和你的變數或函式相同名字的元素或文件就可以結束了名稱衝突,瀏覽器使用他。如果出現這種情況,你的函式突然宣告停止這種情況已經多次在各個網站發生HTML5的發展中

為了避免這種情況,完全權限的全域變數可以使用"窗口”,像這樣:

<script>
  function localName() {
    alert('Function localName has been called');
  }
</script>
<div onclick="window.localName()">Clicking me should show an alert<div>

Don't concatenate scripts you don't control

Edit section

"use strict;" 指令在ECMAScript中,當使用於文件級別上,適用於文件中的一切。因此,追加上取決於嚴格模式行為的腳本嚴格的模式的腳本會導致東西被破壞。

Ask the authors of any JavaScript libraries you use to also follow these guidelines

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推薦喜愛的程式庫給開發者,他們遵循這些指示去開發。如果他們不這樣做,你在未來不能依靠程式庫在未來被破壞不幸,程式庫這些準則是共同的罪犯。

Sniffing

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Sniff for specific features

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如果您打算使用某些功能,使用物件偵測去嗅探準確的特點,如果可能的話。舉一個簡單的例子不假設任何瀏覽器中的"filter" in body.style測試必須是真正的Microsoft Internet Explorer,因此window.event對象提供事件處理程序。不要假設以為瀏覽器會支持一個給定的DOM功能的,還必須具備其他一些特別是非標準,DOM功能。或反過來說,他們不會支持一些其他功能(例如,不假設瀏覽器支持onload的腳本元素將永不支持他們的onreadystatechange)。作為瀏覽器的收斂行為,他們都增加新的功能,並刪除它們。他們還修正錯誤。所有這些都發生在過去,會再次發生。

所以,不要一個功能或對象嗅探,然後假設,因為它的存在或不存在,其他一些功能或對象也必須存在或不存在

Don't UA-sniff

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這的確是假設一個功能(存在一個特定用戶代理(UA)的字符串的子串)意味著大約存在的東西其他功能情況特別常見的實例。

If you have to UA-sniff, only sniff for past browser versions

Edit section

如果你有訴諸於UA嗅探,只用它來針對特定瀏覽器的以往版本的瀏覽器。首先,有一個預設的原始碼路徑,在未知的瀏覽器,在當前和未來版本的瀏覽器測試運行。然後,如果在預設的原始路徑無法在過去版本的或特定的瀏覽器使用和破損可以不被你的預設原始碼路徑偵測在使用某些功能的情況下嗅探,它是可以添加駭客對針對的舊版本特別那些老版本的瀏覽器嗅探瀏覽器。

For the purpose of this piece of advice, "current" means the most recent version of a browser you have tested. For example, if you have tested that your default code path runs properly in Firefox Aurora but Firefox Beta and the latest release have a bug that make your default code path fail, it is OK to treat the Firefox version number that is in Aurora at the moment of testing as "current", and consider the Beta version as a "past" version even though it hasn't been released to the general public yet.

Don't unnecessarily create separate codepaths for different browsers

Edit section

Don't go out of your way to run different code based on either object detection or UA sniffing if one of the codepaths involved actually works in all browsers. There is a good chance of browsers changing behavior to converge with each other and hence breaking the site for those you've sent down one or more of the alternative paths.

Testing

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Test with all major engines

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Test your code at least in Firefox, Chrome or Safari (since both are based on the same WebKit engine), Opera, and Internet Explorer. If you are following the advice given above so that you have a single code path for all current and unknown browsers, testing that this single code path works in all the major engines makes it extremely probable that your code won't break in the future.

Sometimes browsers implement a given feature slightly differently. If you have a single code path that works in all the top engines, it means that you are either using features where browser behavior has already converged or, if the behavior hasn't quite converged yet, your code works regardless of which engine's behavior standards turn out to uphold.

Browser-specific features and prefixes

Edit section

Don't target hacks at current or future versions of browsers

Edit section

This is also a common instance of assuming that present correlation between bugs implies future correlation between bugs. Targeting hacks at old versions of browsers whose current versions no longer have the bug you're relying on for your hack is OK; once a browser has fixed bug X, you can know for certain that all releases that had bug X also had bug Y and use the presence of bug X to target workarounds for bug Y.

For the purpose of this piece of advice, "current" means the most recent version of a browser you have tested, as in the case of the UA sniffing advice above.

Avoid depending on cutting-edge nonstandard features

Edit section

Even if the feature is prefixed, using it could be dangerous: as the specification evolves the browser's prefixed implementation can likewise change to track the specification. And once the feature is standardized, the prefixed version is likely to be removed.

Prefixed, non-standard features are provided by browser developers for you to experiment with and offer feedback on, and aren't meant to be deployed. If you choose to use them, be prepared to need to frequently update your site to keep up with changes.

When using cutting-edge features (even standard ones) that are not universally implemented, make sure to test fallback paths

Edit section

Make sure to test what happens in a browser that doesn't implement the feature you're using, especially if you don't use such a browser day-to-day while working on the site.

Don't use vendor-prefixed features except to target old buggy versions

Edit section

Vendor-prefixed features can change behavior in future releases.  Once a browser has shipped a feature unprefixed, however, you can use the prefixed version to target old releases by making sure to always use the unprefixed version of the feature when available.  A good example, for a browser vendor using the -vnd CSS prefix that has shipped an unprefixed implementation of the make-it-pretty property, with a behavior for the value "sometimes" that differs from the prefixed version:

<style>
  .pretty-element {
    -vnd-make-it-pretty: sometimes;
    make-it-pretty: sometimes;
  }
</style>

The order of the declarations in the rule above is important: the unprefixed one needs to come last.

Don't use unprefixed versions of CSS properties or APIs until at least one browser supports them

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Until there's decently widespread support of the unprefixed version of something, its behavior can still change in unexpected ways.  Most especially, don't use the unprefixed version if no browser actually supports it. You can't assume that the syntax of the final version will be the same as the syntax of any of the prefixed versions.

Code hygiene

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Avoid missing >

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Passing a validator is one way to ensure this, but even if your website doesn't validate entirely you should make sure all your > characters are present. Missing those can lead to unexpected situations due to a following tag name being treated as an attribute on a previous tag. This can work for a bit, then break if a specification attaches a meaning to that attribute. Here's an example that works in browsers without HTML5 support but breaks in a browser supporting HTML5:

  1. <form action="http://www.example.com">  
  2.   <input type="submit" value="Submit the form"  
  3. </form>  

due to the missing > on the input tag.

Don't leave experiments that didn't work in your code

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If you try using a CSS property to do something you want, but it has no effect, remove it.  It might start doing something you don't expect in the future.

版本來源

<p> </p>
<p><span>此</span><span>頁</span><span>解釋</span><span>如何編寫</span>網站<span>才能在</span><span>新的瀏覽器</span><span>版本發布</span>時不被破壞<span>。</span></p>
<p>這對內聯網和<span>其他</span><span>非公共</span>網站尤其重要,如果我們不能看到你的原始碼,我們不能<span>看到</span><span>它被破壞</span>。<span>它並不總是</span>遵循所有這些,但他們盡可能多的將有助於您的網站往未來發展<br>  </p>
<div id="section_1"> <h2 class="editable">JavaScript</h2> <div class="editIcon"> <h2 class="editable"><a href="/Writing_Forward_Compatible_Websites?action=edit&amp;sectionId=1" title="Edit section"><span class="icon"><img alt="Edit section" class="sectionedit" src="/skins/common/icons/icon-trans.gif"></span></a></h2> </div> <div id="section_2"> <h3 class="editable">Prefix all global variable access in <code>onfoo</code> attributes with “<code>window</code>.”</h3> <div class="editIcon"> <h3 class="editable"><a href="/Writing_Forward_Compatible_Websites?action=edit&amp;sectionId=2" title="Edit section"><span class="icon"><img alt="Edit section" class="sectionedit" src="/skins/common/icons/icon-trans.gif"></span></a></h3> </div> <p><span>當一</span>事件<span>處理程序</span><span>的內容</span><span>屬性</span><span>(</span>onclick,onmouseover等等)被使用在HTML的元件上<span>,</span><span>所有的名稱</span><span>查找</span><span>屬性中</span><span>首先</span><span>發生</span><span>元素本身,</span><span>則</span><span>該元素的</span>形式元素是否是窗體控件,然後<span>在</span>文件<span>,然後在</span>窗口(其中<span>已定義的</span>全域變數)。<span>例如,如果</span><span>你</span><span>有</span><span>這樣的標記</span><span>:</span></p> <pre>&lt;div onclick="alert(ownerDocument)"&gt;Click me&lt;/div&gt;</pre> <p><span>然後</span><span>點擊</span><span>文本</span>提醒<span>div的</span><span>ownerDocument</span>。發生這種情況,即使是在全球範圍內宣布一個var <span class="hps">ownerDocument</span>。</p> <p><span>這意思</span>是任何時候你在事件處理程序的內容屬性,包括調用任何全域函數和<span>全域變數</span>,如果一個規範增加了一個新的DOM屬性到具有和你的變數或函式相同名字的元素<span>或文件</span>就可以結束了名稱衝突,瀏覽器使用他。<span>如果出現這種情況</span>,你的函式突然宣告停止<span>。</span><span>這種情況已經</span><span>多次在各</span><span>個網站發生</span><span>在</span><span>HTML5的</span><span>發展中</span><span>。</span></p> <p><span>為了避免這種情況</span>,完全權限的全域變數可以使用"<span class="atn">窗口”</span>,像這樣:</p> <pre>&lt;script&gt;
  function localName() {
    alert('Function localName has been called');
  }
&lt;/script&gt;
&lt;div onclick="<strong>window.</strong>localName()"&gt;Clicking me should show an alert&lt;div&gt;
</pre> </div> <div id="section_3"> <h3 class="editable">Don't concatenate scripts you don't control</h3> <div class="editIcon"> <h3 class="editable"><a href="/Writing_Forward_Compatible_Websites?action=edit&amp;sectionId=3" title="Edit section"><span class="icon"><img alt="Edit section" class="sectionedit" src="/skins/common/icons/icon-trans.gif"></span></a></h3> </div> <p><code>"use strict;"</code> 指令在ECMAScript中,當使用於文件級別上,適用於文件中的一切。因此,追加上<span>取決於</span>非<span>嚴格</span><span>模式</span><span>的</span><span>行為</span>的腳本<span>到</span>嚴格的模式的腳本會導致東西被破壞。</p> </div> <div id="section_4"> <h3 class="editable">Ask the authors of any JavaScript libraries you use to also follow these guidelines</h3> <div class="editIcon"> <h3 class="editable"><a href="/Writing_Forward_Compatible_Websites?action=edit&amp;sectionId=4" title="Edit section"><span class="icon"><img alt="Edit section" class="sectionedit" src="/skins/common/icons/icon-trans.gif"></span></a></h3> </div> <p><span>推薦</span><span>你</span><span>喜愛的程式庫給開發者</span>,他們遵循這些指示去開發。如果他們不這樣做,你在未來<span>不能依靠程式庫在未來被破壞</span><span>。</span><span>不幸</span>的<span>是</span><span>,程式庫</span>這些準則是共同的罪犯。</p> </div>
</div>
<div id="section_5"> <h2 class="editable">Sniffing</h2> <div class="editIcon"> <h2 class="editable"><a href="/Writing_Forward_Compatible_Websites?action=edit&amp;sectionId=5" title="Edit section"><span class="icon"><img alt="Edit section" class="sectionedit" src="/skins/common/icons/icon-trans.gif"></span></a></h2> </div> <div id="section_6"> <h3 class="editable">Sniff for specific features</h3> <div class="editIcon"> <h3 class="editable"><a href="/Writing_Forward_Compatible_Websites?action=edit&amp;sectionId=6" title="Edit section"><span class="icon"><img alt="Edit section" class="sectionedit" src="/skins/common/icons/icon-trans.gif"></span></a></h3> </div> <p><span>如果您打算</span><span>使用某些</span>功能,使用物件偵測去嗅探準確的特點,如果可能的話。舉<span>一個簡單的例子</span><span>,</span><span>不假設</span>任何瀏覽器中的"filter" in body.style測試必須是真正<span>的Microsoft Internet Explorer</span><span>,因此</span><span>如</span><span>將</span>有<span>window.event對象</span>提供事件處理程序。不要假設以為瀏覽器會支持一個給定的DOM功能的,<span>還必須具備</span><span>其他一些</span>,<span>特別是</span><span>非標準</span>,DOM功能。或反過來說,他們不會支持一些其他功能(例如,不假設瀏覽器支持<span>onload的</span><span>腳本元素</span>將永不支持他們的onreadystatechange)。作為瀏覽器的收斂行為,<span>他們都</span><span>增加新的功能</span>,並刪除它們。他們還修正錯誤。所有這些都發生在過去,會再次發生。</p> <p><span>所以,不要</span>為<span>一個</span>功能或對象嗅探,然後假設,因為它的存在或不存在,其他一些功能或對象也必須<span>存在或</span><span>不存在</span><span>。</span></p> </div> <div id="section_7"> <h3 class="editable">Don't UA-sniff</h3> <div class="editIcon"> <h3 class="editable"><a href="/Writing_Forward_Compatible_Websites?action=edit&amp;sectionId=7" title="Edit section"><span class="icon"><img alt="Edit section" class="sectionedit" src="/skins/common/icons/icon-trans.gif"></span></a></h3> </div> <p><span>這的確是</span>假設一個功能(存在一個特定用戶代理(UA)的字符串的子串)意味著大約存在的<span>東西</span><span>或</span><span>其他功能</span><span>的</span><span>情況</span><span>下</span><span>,</span><span>特別</span><span>常見</span>的實例。</p> <div id="section_8"> <h4 class="editable">If you have to UA-sniff, only sniff for past browser versions</h4> <div class="editIcon"> <h4 class="editable"><a href="/Writing_Forward_Compatible_Websites?action=edit&amp;sectionId=8" title="Edit section"><span class="icon"><img alt="Edit section" class="sectionedit" src="/skins/common/icons/icon-trans.gif"></span></a></h4> </div> <div id="gt-res-wrap"> <div class="almost_half_cell" id="gt-res-content"> <div dir="ltr"><span id="result_box" lang="zh-TW"><span>如果你有</span>訴諸於UA嗅探,只用它來針對特定瀏覽器的以往版本的瀏覽器。首先,<span>有一個預設的原始</span><span>碼路徑</span>,在未知的瀏覽器,在當前和未來版本的瀏覽器測試運行。然後,如果在預設的原始<span>碼</span><span>路徑無法在</span></span>過去版本的或特定的瀏覽器使用和破損可以不被你的預設原始碼路徑偵測在使用某些功能的情況下嗅探,它是可以添加駭客對針對的舊版本特別那些老版本的瀏覽器嗅探瀏覽器。</div> </div> <div id="gt-res-tools">  </div> </div> <p>For the purpose of this piece of advice, "current" means the most recent version of a browser you have tested. For example, if you have tested that your default code path runs properly in Firefox Aurora but Firefox Beta and the latest release have a bug that make your default code path fail, it is OK to treat the Firefox version number that is in Aurora at the moment of testing as "current", and consider the Beta version as a "past" version even though it hasn't been released to the general public yet.</p> </div> </div> <div id="section_9"> <h3 class="editable">Don't unnecessarily create separate codepaths for different browsers</h3> <div class="editIcon"> <h3 class="editable"><a href="/Writing_Forward_Compatible_Websites?action=edit&amp;sectionId=9" title="Edit section"><span class="icon"><img alt="Edit section" class="sectionedit" src="/skins/common/icons/icon-trans.gif"></span></a></h3> </div> <p>Don't go out of your way to run different code based on either object detection or UA sniffing if one of the codepaths involved actually works in all browsers. There is a good chance of browsers changing behavior to converge with each other and hence breaking the site for those you've sent down one or more of the alternative paths.</p> </div>
</div>
<div id="section_10"> <h2 class="editable">Testing</h2> <div class="editIcon"> <h2 class="editable"><a href="/Writing_Forward_Compatible_Websites?action=edit&amp;sectionId=10" title="Edit section"><span class="icon"><img alt="Edit section" class="sectionedit" src="/skins/common/icons/icon-trans.gif"></span></a></h2> </div> <div id="section_11"> <h3 class="editable">Test with all major engines</h3> <div class="editIcon"> <h3 class="editable"><a href="/Writing_Forward_Compatible_Websites?action=edit&amp;sectionId=11" title="Edit section"><span class="icon"><img alt="Edit section" class="sectionedit" src="/skins/common/icons/icon-trans.gif"></span></a></h3> </div> <p>Test your code at least in Firefox, Chrome or Safari (since both are based on the same WebKit engine), Opera, and Internet Explorer. If you are following the advice given above so that you have a single code path for all current and unknown browsers, testing that this single code path works in all the major engines makes it extremely probable that your code won't break in the future.</p> <p>Sometimes browsers implement a given feature slightly differently. If you have a single code path that works in all the top engines, it means that you are either using features where browser behavior has already converged or, if the behavior hasn't quite converged yet, your code works regardless of which engine's behavior standards turn out to uphold.</p> </div>
</div>
<div id="section_12"> <h2 class="editable">Browser-specific features and prefixes</h2> <div class="editIcon"> <h2 class="editable"><a href="/Writing_Forward_Compatible_Websites?action=edit&amp;sectionId=12" title="Edit section"><span class="icon"><img alt="Edit section" class="sectionedit" src="/skins/common/icons/icon-trans.gif"></span></a></h2> </div> <div id="section_13"> <h3 class="editable">Don't target hacks at current or future versions of browsers</h3> <div class="editIcon"> <h3 class="editable"><a href="/Writing_Forward_Compatible_Websites?action=edit&amp;sectionId=13" title="Edit section"><span class="icon"><img alt="Edit section" class="sectionedit" src="/skins/common/icons/icon-trans.gif"></span></a></h3> </div> <p>This is also a common instance of assuming that present correlation between bugs implies future correlation between bugs. Targeting hacks at <strong>old</strong> versions of browsers whose current versions no longer have the bug you're relying on for your hack is OK; once a browser has fixed bug X, you can know for certain that all releases that had bug X also had bug Y and use the presence of bug X to target workarounds for bug Y.</p> <p>For the purpose of this piece of advice, "current" means the most recent version of a browser you have tested, as in the case of the UA sniffing advice above.</p> </div> <div id="section_14"> <h3 class="editable">Avoid depending on cutting-edge nonstandard features</h3> <div class="editIcon"> <h3 class="editable"><a href="/Writing_Forward_Compatible_Websites?action=edit&amp;sectionId=14" title="Edit section"><span class="icon"><img alt="Edit section" class="sectionedit" src="/skins/common/icons/icon-trans.gif"></span></a></h3> </div> <p>Even if the feature is prefixed, using it could be dangerous: as the specification evolves the browser's prefixed implementation can likewise change to track the specification. And once the feature is standardized, the prefixed version is likely to be removed.</p> <p>Prefixed, non-standard features are provided by browser developers for you to experiment with and offer feedback on, and aren't meant to be deployed. If you choose to use them, be prepared to need to frequently update your site to keep up with changes.</p> </div> <div id="section_15"> <h3 class="editable">When using cutting-edge features (even standard ones) that are not universally implemented, make sure to test fallback paths</h3> <div class="editIcon"> <h3 class="editable"><a href="/Writing_Forward_Compatible_Websites?action=edit&amp;sectionId=15" title="Edit section"><span class="icon"><img alt="Edit section" class="sectionedit" src="/skins/common/icons/icon-trans.gif"></span></a></h3> </div> <p>Make sure to test what happens in a browser that doesn't implement the feature you're using, especially if you don't use such a browser day-to-day while working on the site.</p> </div> <div id="section_16"> <h3 class="editable">Don't use vendor-prefixed features except to target old buggy versions</h3> <div class="editIcon"> <h3 class="editable"><a href="/Writing_Forward_Compatible_Websites?action=edit&amp;sectionId=16" title="Edit section"><span class="icon"><img alt="Edit section" class="sectionedit" src="/skins/common/icons/icon-trans.gif"></span></a></h3> </div> <p>Vendor-prefixed features can change behavior in future releases.  Once a browser has shipped a feature unprefixed, however, you can use the prefixed version to target old releases by making sure to always use the unprefixed version of the feature when available.  A good example, for a browser vendor using the <code>-vnd</code> CSS prefix that has shipped an unprefixed implementation of the <code>make-it-pretty</code> property, with a behavior for the value <code>"sometimes"</code> that differs from the prefixed version:</p> <pre>&lt;style&gt;
  .pretty-element {
    -vnd-make-it-pretty: sometimes;
    make-it-pretty: sometimes;
  }
&lt;/style&gt;
</pre> <p>The order of the declarations in the rule above is important: the unprefixed one needs to come last.</p> </div> <div id="section_17"> <h3 class="editable">Don't use unprefixed versions of CSS properties or APIs until at least one browser supports them</h3> <div class="editIcon"> <h3 class="editable"><a href="/Writing_Forward_Compatible_Websites?action=edit&amp;sectionId=17" title="Edit section"><span class="icon"><img alt="Edit section" class="sectionedit" src="/skins/common/icons/icon-trans.gif"></span></a></h3> </div> <p>Until there's decently widespread support of the unprefixed version of something, its behavior can still change in unexpected ways.  Most especially, don't use the unprefixed version if no browser actually supports it. You can't assume that the syntax of the final version will be the same as the syntax of any of the prefixed versions.</p> </div>
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<div id="section_18"> <h2 class="editable">Code hygiene</h2> <div class="editIcon"> <h2 class="editable"><a href="/Writing_Forward_Compatible_Websites?action=edit&amp;sectionId=18" title="Edit section"><span class="icon"><img alt="Edit section" class="sectionedit" src="/skins/common/icons/icon-trans.gif"></span></a></h2> </div> <div id="section_19"> <h3 class="editable">Avoid missing <code>&gt;</code></h3> <div class="editIcon"> <h3 class="editable"><a href="/Writing_Forward_Compatible_Websites?action=edit&amp;sectionId=19" title="Edit section"><span class="icon"><img alt="Edit section" class="sectionedit" src="/skins/common/icons/icon-trans.gif"></span></a></h3> </div> <p>Passing a validator is one way to ensure this, but even if your website doesn't validate entirely you should make sure all your <code>&gt;</code> characters are present. Missing those can lead to unexpected situations due to a following tag name being treated as an attribute on a previous tag. This can work for a bit, then break if a specification attaches a meaning to that attribute. Here's an example that works in browsers without HTML5 support but breaks in a browser supporting HTML5:</p> <div class="dp-highlighter"> <div class="bar"> <div class="tools"><a href="/Writing_Forward_Compatible_Websites#">view plain</a><a href="/Writing_Forward_Compatible_Websites#">print</a><a href="/Writing_Forward_Compatible_Websites#">?</a></div> </div> <ol class="dp-xml" start="1"> <li class="alt"><span class="tag">&lt;</span><span class="tag-name">form</span> <span class="attribute">action</span>=<span class="attribute-value">"<a class=" external" href="http://www.example.com" rel="freelink">http://www.example.com</a>"</span><span class="tag">&gt;</span>  </li> <li>  <span class="tag">&lt;</span><span class="tag-name">input</span> <span class="attribute">type</span>=<span class="attribute-value">"submit"</span> <span class="attribute">value</span>=<span class="attribute-value">"Submit the form"</span>  </li> <li class="alt"><span class="tag">&lt;/</span><span class="tag-name">form</span><span class="tag">&gt;</span>  </li> </ol> </div> <p>due to the missing <code>&gt;</code> on the <code>input</code> tag.</p> </div> <div id="section_20"> <h3 class="editable">Don't leave experiments that didn't work in your code</h3> <div class="editIcon"> <h3 class="editable"><a href="/Writing_Forward_Compatible_Websites?action=edit&amp;sectionId=20" title="Edit section"><span class="icon"><img alt="Edit section" class="sectionedit" src="/skins/common/icons/icon-trans.gif"></span></a></h3> </div> <p>If you try using a CSS property to do something you want, but it has no effect, remove it.  It might start doing something you don't expect in the future.</p> </div>
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