govuk-frontend/dist/govuk/components/breadcrumbs/template-default.html

GOV.UK Frontend contains the code you need to start building a user interface for government platforms and services.

<nav class="govuk-breadcrumbs" aria-label="Breadcrumb">
  <ol class="govuk-breadcrumbs__list">
    <li class="govuk-breadcrumbs__list-item">
      <a class="govuk-breadcrumbs__link" href="/section">Section</a>
    </li>
    <li class="govuk-breadcrumbs__list-item">
      <a class="govuk-breadcrumbs__link" href="/section/sub-section">Sub-section</a>
    </li>
  </ol>
</nav>