El marcado de microdatos es un método automático mediante el cual Javascript añade una anotación de esquema en el encabezado de la página.

The statement is false because microdata markup is typically added directly into the HTML of a webpage, not automatically by JavaScript in the page header. While JavaScript can dynamically add or modify schema markup, microdata itself is an HTML specification for embedding semantic information directly into the content. Other schema markup formats like JSON-LD are often implemented using JavaScript, but microdata's primary characteristic is its direct integration into HTML attributes. Therefore, the method described is not an inherent function of microdata markup.