ole.html -->
<article data-testname="el-article" data-expectedrole="article" class="ex">x</article>
<!-- aside -> ./roles-contextual.html -->
<!-- todo: audio -->
<!-- todo: autonomous custom element -->
<!-- b -> ./roles-generic.html -->
<!-- base (not mapped) -->
<!-- bdi -> ./roles-generic.html -->
<!-- bdo -> ./roles-generic.html -->
<blockquote data-testname="el-blockquote" data-expectedrole="blockquote" class="ex">x</blockquote>
<!-- todo: body -->
<!-- br (not mapped) -->
<button data-testname="el-bu