¡Que pasa sin no pongo content="1", content="2" y content="3"?
Código HTML:
<ol itemscope itemtype="http://schema.org/BreadcrumbList"> <li itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem"> <a itemprop="item" href="https://example.com/arts"> <span itemprop="name">Arts</span></a> <meta itemprop="position" content="1" /> </li> › <li itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem"> <a itemprop="item" href="https://example.com/arts/books"> <span itemprop="name">Books</span></a> <meta itemprop="position" content="2" /> </li> › <li itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem"> <a itemprop="item" href="https://example.com/arts/books/poetry"> <span itemprop="name">Poetry</span></a> <meta itemprop="position" content="3" /> </li> </ol>