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, por ejemplo,
¿Es
XHTML - Es obligatorio. Un documento XHTML debe tener una declaración XHTML. Los elementos , , 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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¿Son los elementos HTML insensibles a mayúsculas?
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<div class="accordion__panel-body" role="tabpanel" data-qa-tag="faq-tab-8-content">HTML no es sensible a mayúsculas Las etiquetas HTML no son sensibles a mayúsculas: <DIV> significa lo mismo que <div>. El estándar HTML no requiere etiquetas en minúsculas, pero W3C recomienda minúsculas en HTML y exige minúsculas para tipos de documentos más estrictos como XHTML.</div>
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