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Always Use Well-formed Code

For those not familiar with XHTML, the first thing to know is that all code should validate (according to the doctype) and be well-formed (a valid XML document). Here is a basic run down of the rules of well-formed XML as well as the key differences between XHTML and HTML.

All elements should be closed, e.g.

<br/>

These are also acceptable:

<br> </br> <br />All non-empty elements should be closed:
<p>Example Text</p>All elements must be properly nested:
<em><strong>Example Text</strong></em>The alt attribute must be used for all images:
<img src="image.png" alt="Image Description" />Text should appear within a block level element and not directly in the body:
<body><p>Example Text</p></body>

Inline elements should always nest with block level elements:

<h2><em>Example Text</em></h2>

All attributes should appear within quotes:

<p class="names"/>

All elements and attributes should use lowercase:

<p class="Sm">Example Text <hr noshade="true"/></p>


There are many online Web tools that you can use to validate your markup including the MobiReady Report and the W3C Validation service. There are also browser-based tools such as the HTML Validator Firefox Extension that can be used throughout the development cycle to keep an eye on your pages.

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Posted by xiaopy12 1 week ago

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