Los documentos XHTML deben usar minúsculas para todos los nombres de elementos y atributos HTML. Esta diferencia es necesaria porque XML es sensible a mayúsculas y minúsculas, por ejemplo,
¿Es
XHTML - Es obligatorio. Un documento XHTML debe tener una declaración XHTML. Las etiquetas , , y
también deben estar presentes, y el atributo xmlns en <html> debe especificar el espacio de nombres XML para el documento.</div>
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