If a document has words or phrases which are not in the document's primary language, those words or phrases should be properly marked. This helps indicate which language or voice a screen-reader should use to read the text.

Example

Wrong

<p>This is a paragraph in english.</p><p>Esta frase es en espa&ntilde;ol.</p> (Spanish)</p>

Right

<p>This is a paragraph in english.</p><p lang="es">Esta frase es en espa&ntilde;ol.</p>