Без микроразметки (yii\widgets\Breadcrumbs)
<ul class="breadcrumb">
<li>
<a class="home" href="/">Home</a>
</li>
<li>
<a href="/catalog">Catalog</a>
</li>
<li class="active">
Computers
</li>
</ul>
С микроразметкой Microdata и Schema.org (common\widgets\BreadcrumbsMicrodata)
<ul class="breadcrumb" itemscope itemtype="http://schema.org/BreadcrumbList">
<li itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem">
<a class="home" href="/" itemprop="item">
<span itemprop="name">Home</span>
</a>
<meta itemprop="position" content="1"/>
</li>
<li itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem">
<a href="/catalog" itemprop="item">
<span itemprop="name">Catalog</span>
</a>
<meta itemprop="position" content="2"/>
</li>
<li class="active" itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem">
<span itemprop="item">
<span itemprop="name">Computers</span>
</span>
<meta itemprop="position" content="3"/>
</li>
</ul>
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