This is the default markup from Blacklight 5.3.
<span
class="btn-group applied-filter constraint filter filter-subject_ssim"
>
<span class="constraint-value btn btn-outline-secondary">
<span class="filter-name">Topic</span>
<span class="filter-value" title="Theater">Theater</span>
</span>
<a
class="btn btn-outline-secondary remove"
href="http://localhost:3000/?f%5Blanguage_ssim%5D%5B%5D=Japanese"
>
<span class="blacklight-icons blacklight-icons-remove"
><svg
xmlns="http://www.w3.org/2000/svg"
width="16"
height="16"
fill="currentColor"
class="bi bi-x fs-4"
viewBox="0 0 16 16"
>
<path
d="M4.646 4.646a.5.5 0 0 1 .708 0L8 7.293l2.646-2.647a.5.5 0 0 1 .708.708L8.707 8l2.647 2.646a.5.5 0 0 1-.708.708L8 8.707l-2.646 2.647a.5.5 0 0 1-.708-.708L7.293 8 4.646 5.354a.5.5 0 0 1 0-.708"
></path>
</svg>
</span>
<span class="sr-only visually-hidden"
>Remove constraint Topic: Theater</span
>
</a></span
>