chrome/browser/resources/tab_search/app.html

<style include="mwb-shared-style">
  #no-results {
    color: var(--cr-primary-text-color);
    font-size: var(--mwb-primary-text-font-size);
    padding: 12px;
    text-align: center;
  }

  #feedback-text {
    color: var(--cr-primary-text-color);
    font-size: var(--mwb-primary-text-font-size);
    margin-inline-start: var(--mwb-list-item-horizontal-margin);
    user-select: none;
  }

  #feedback-footer {
    border: none;
    border-top: 1px solid var(--google-grey-refresh-500);
    height: 40px;
    width: 100%;
  }

  #feedback-footer:focus {
    background-color: var(--mwb-list-item-selected-background-color);
    outline: none;
  }

  #feedback-icon {
    --iron-icon-fill-color: var(--google-grey-refresh-700);
    height: var(--mwb-icon-size);
    width: var(--mwb-icon-size);
  }

  @media (prefers-color-scheme: dark) {
    #feedback-icon {
      --iron-icon-fill-color: var(--google-blue-refresh-300);
    }
  }

  .list-section-title {
    align-items: center;
    background-color: var(--mwb-background-color);
    color: var(--cr-secondary-text-color);
    display: flex;
    font-size: var(--mwb-list-section-title-font-size);
    height: var(--mwb-list-section-title-height);
    padding-inline-start: 8px;
    position: sticky;
    text-transform: uppercase;
    top: 0;
    z-index: 1000;
  }
</style>
<tab-search-search-field id="searchField" autofocus
    clear-label="$i18n{clearSearch}" label="$i18n{searchTabs}"
    on-focus="onSearchFocus_" on-keydown="onSearchKeyDown_"
    on-search-changed="onSearchChanged_"
    search-result-text="[[searchResultText_]]">
</tab-search-search-field>
<div hidden="[[!filteredTabItemsCount_(filteredOpenTabs_, filteredRecentlyClosedTabs_)]]">
  <infinite-list id="tabsList" max-height="[[listMaxHeight_(availableHeight_)]]"
      items="[[listItems_(filteredOpenTabs_, filteredRecentlyClosedTabs_)]]">
    <template data-type="TitleItem">
      <div class="list-section-title">[[item.title]]</div>
    </template>
    <template data-type="TabData" data-selectable>
      <tab-search-item id="[[item.tab.tabId]]" aria-label="[[ariaLabel_(item)]]"
          class="mwb-list-item" data="[[item]]" index="[[index]]"
          on-click="onItemClick_" on-close="onItemClose_"
          on-focus="onItemFocus_" on-keydown="onItemKeyDown_" role="option"
          tabindex="0">
      </tab-search-item>
    </template>
  </infinite-list>
</div>
<div id="no-results" hidden="[[filteredTabItemsCount_(filteredOpenTabs_, filteredRecentlyClosedTabs_)]]">
  $i18n{noResultsFound}
</div>