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---
title: XHTML
slug: XHTML
tags:
- CodingScripting
- Glossário
- XHTML
translation_of: Glossary/XHTML
---
<p><a href="/pt-PT/docs/Web/HTML" title="HTML">HTML</a> pode viajar através da rede para um navegador quer em sintaxe de HTML ou uma sintaxe chamada de <a href="/pt-PT/docs/Introducao_a_XML">XML</a>.</p>
<h2 id="HTML5_e_HTMLXHTML">HTML5 e HTML/XHTML</h2>
<p>O padrão de <a href="/en-US/docs/HTML/HTML5" title="HTML5">HTML5</a> define ambas as sintaxes. O tipo MIME (enviado no cabeçalho <code style="font-style: normal;">Content-Type</code> de HTTP) indica a escolha da sintaxe: para XHTML o tipo MIME irá ser <code style="font-style: normal;">application/xhtml+xml</code>, de outro modo <code>text/html</code>.</p>
<p>Este exemplo mostra um documento HTML e um documento XHTML incluindo os cabeçalhos de HTTP apropriados:</p>
<h3 id="Documento_HTML">Documento HTML</h3>
<pre class="brush: html">HTTP/1.1 200 OK
Content-Type: text/html
<!DOCTYPE html>
<html lang=en>
<head>
<meta charset=utf-8>
<title>HTML</title>
</head>
<body>
<p>I am a HTML document</p>
</body>
</html>
</pre>
<h3 id="Documento_XHTML">Documento XHTML</h3>
<pre class="brush: xml">HTTP/1.1 200 OK
Content-Type: application/xhtml+xml
<html xml:lang="en" xmlns="<code>http://www.w3.org/1999/xhtml</code>">
<head>
<title>XHTML</title>
</head>
<body>
<p>I am a XHTML document</p>
</body>
</html>
</pre>
<h2 id="Tipo_MIME_versus_DOCTYPE">Tipo MIME <em>versus </em>DOCTYPE</h2>
<p>Before HTML5, the two separate specifications defined the two syntaxes (<a class="external" href="http://www.w3.org/TR/html4/" title="http://www.w3.org/TR/html4/">HTML 4.01</a> and <a class="external" href="http://www.w3.org/TR/xhtml1/">XHTML 1.0</a>). According to the XHTML1 standard, you could use XHTML by declaring a special DOCTYPE. However, no browsers have ever implemented this, and the HTML5 standard has reversed the decision. <strong>If your page is sent as <code>text/html</code>, you are not using XHTML</strong>.</p>
<p>Instead, the proper MIME type must be present in the <code>Content-Type</code> HTTP header. If you only put the MIME type into an HTML meta tag like <code><meta http-equiv=…></code>, it will be ignored and treated like <code>text/html</code>.</p>
<p>If you serve your pages as <code>text/html</code> and believe that you are writing XHTML, you may face several problems, as described in these articles:</p>
<ul>
<li><a class="external" href="http://www.spartanicus.utvinternet.ie/no-xhtml.htm">No to XHTML</a> an excellent article from Spartanicus</li>
<li><a class="external" href="http://www.webdevout.net/articles/beware-of-xhtml">Beware of XHTML</a> by David Hammond</li>
<li><a class="external" href="http://www.hixie.ch/advocacy/xhtml">Sending XHTML as text/html Considered Harmful</a> by Ian Hickson</li>
<li><a class="external" href="http://www.xml.com/pub/a/2003/03/19/dive-into-xml.html">XHTML's Dirty Little Secret</a> by Mark Pilgrim</li>
<li><a class="external" href="http://hsivonen.iki.fi/xhtml-the-point/">XHTML - What's the Point?</a> by Henri Sivonen</li>
<li><a class="external" href="http://lachy.id.au/log/2005/12/xhtml-beginners">XHTML is not for Beginners</a> by Lachlan Hunt</li>
</ul>
<h2 id="Suporte">Suporte</h2>
<p>Most browsers currently support XHTML, including Firefox, Chrome, Safari, Opera, and Internet Explorer (since IE 9). (Internet Explorer 8 and older browsers instead show a download dialog box for unknown file types when they see an XHTML document with the correct XHTML MIME type.)</p>
<p>Also be aware that many popular {{Glossary("JavaScript")}} libraries and developer tools have limited or no support for XHTML.</p>
<h2 id="Diferençãs_do_HTML">Diferençãs do HTML</h2>
<p>See <a href="/en-US/docs/Properly_Using_CSS_and_JavaScript_in_XHTML_Documents" title="Properly Using CSS and JavaScript in XHTML Documents">Properly Using CSS and JavaScript in XHTML Documents</a> for a partial list of differences between HTML and XHTML.</p>
<h2 id="Tools" name="Tools">Ferramentas</h2>
<ul>
<li><a href="/en-US/docs/Standards-Compliant_Authoring_Tools" title="Standards-Compliant_Authoring_Tools">Standards-Compliant Authoring Tools</a></li>
</ul>
<h2 id="Consulte_também">Consulte também</h2>
<ul>
<li><a href="/pt-PT/docs/Web/HTML" title="HTML">HTML</a></li>
<li><a href="/pt-PT/docs/Namespaces" title="Namespaces">Espaços de Nomes</a></li>
</ul>
<p><span class="alllinks"><a href="/en-US/docs/tag/XHTML:Tools" title="tag/XHTML:Tools">View All...</a></span></p>
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