discourse/app/assets/javascripts/admin/templates/embedding.hbs

<div class='embeddable-hosts'>
  {{#if embedding.embeddable_hosts}}
    <table class='embedding'>
      <tr>
        <th style='width: 50%'>{{i18n "admin.embedding.host"}}</th>
        <th style='width: 30%'>{{i18n "admin.embedding.category"}}</th>
        <th style='width: 20%'>&nbsp;</th>
      </tr>
      {{#each embedding.embeddable_hosts as |host|}}
        {{embeddable-host host=host deleteHost="deleteHost"}}
      {{/each}}
    </table>
  {{else}}
    <p>{{i18n "admin.embedding.get_started"}}</p>
  {{/if}}

  {{d-button label="admin.embedding.add_host" action="addHost" icon="plus" class="btn-primary add-host"}}
</div>

{{#if showSecondary}}
  <div class='embedding-secondary'>
    <p>{{{i18n "admin.embedding.sample"}}}</p>
    {{highlighted-code code=embeddingCode lang="html"}}
  </div>

  <hr>

  <div class='embedding-secondary'>
    <h3>{{i18n "admin.embedding.settings"}}</h3>

    {{embedding-setting field="embed_by_username" value=embedding.embed_by_username}}
    {{embedding-setting field="embed_post_limit" value=embedding.embed_post_limit}}
    {{embedding-setting field="embed_truncate" value=embedding.embed_truncate type="checkbox"}}
  </div>

  <div class='embedding-secondary'>
    <h3>{{i18n "admin.embedding.feed_settings"}}</h3>
    <p class="description">{{i18n "admin.embedding.feed_description"}}</p>

    {{embedding-setting field="feed_polling_enabled" value=embedding.feed_polling_enabled type="checkbox"}}
    {{embedding-setting field="feed_polling_url" value=embedding.feed_polling_url}}
    {{embedding-setting field="embed_username_key_from_feed" value=embedding.embed_username_key_from_feed}}
  </div>

  <div class='embedding-secondary'>
    <h3>{{i18n "admin.embedding.crawling_settings"}}</h3>
    <p class="description">{{i18n "admin.embedding.crawling_description"}}</p>

    {{embedding-setting field="embed_whitelist_selector"
                        value=embedding.embed_whitelist_selector
                        placeholder="article, #story, .post"}}

    {{embedding-setting field="embed_blacklist_selector"
                        value=embedding.embed_blacklist_selector
                        placeholder=".ad-unit, header"}}

    {{embedding-setting field="embed_classname_whitelist"
                        value=embedding.embed_classname_whitelist
                        placeholder="emoji, classname"}}
  </div>

  <div class='embedding-secondary'>
    {{d-button label="admin.embedding.save"
               action="saveChanges"
               class="btn-primary embed-save"
               disabled=embedding.isSaving}}

    {{#if saved}}{{i18n "saved"}}{{/if}}
  </div>
{{/if}}