Diferencias entre XHTML y HTML

 

html vs xhtml

XHTML son las siglas de EXtensible Hyper Text Markup Language.

XHTML es una versión de HTML más estricta y basada en XML.

XHTML es HTML definido como una aplicación XML.

XHTML es compatible con todos los navegadores principales.

Características principales de XHTML:

  • El DOCTYPE es necesario. En XHTML debemos declarar explícitamente el tipo de documento de que se trate.
  • Todas las etiquetas y atributos en minúscula. Esta es una regla común a todos los sublenguajes xml. Todas las etiquetas (tags) deberán ir escritas en minúsculas. Todos los atributos de los elementos, en minúsculas.

MAL: <INPUT TYPE="text" NAME="nombre" SIZE="20">

BIEN: <input type="text" name="nombre" size="20">

  • Todos los valores de atributos entrecomillados.

MAL: <font size=2> 

BIEN: <font size="2">

  • Todas las etiquetas deben ir cerradas. Esto incluye la necesidad de cerrar las clásicas parejas de etiquetas de HTML, incluso aquéllas que usualmente se consideraban que no eran necesarias: <li></li> <p></p> <option></option> , pero también los elementos vacíos, es decir, aquellas etiquetas que en HTML no van en parejas.

MAL: <br >

BIEN: <br> </br> ó <br/> ó <br />

  • Los elementos XHTML deben estar correctamente anidados.

MAL: <b><i>Texto</b></i>

BIEN: <b><i>Texto</i></b>

  • En XHTML, los nombres de los elementos siempre deben estar en minúsculas:

MAL:

<BODY>
<P>Etiqueta párrafo</P>
</BODY>

BIEN:

<body>
<p>Etiqueta párrafo</p>
</body>

Para validar una página usaremos W3C:

https://validator.w3.org/

 

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