chromium/chrome/browser/resources/extensions/activity_log/activity_log_history.html

<style include="shared-style">
  :host {
    --activity-log-call-and-count-width: 514px;
    --activity-type-width: 85px;
    --activity-count-width: 100px;

    display: flex;
    flex-direction: column;
  }

  cr-search-field {
    align-self: center;
    margin-inline-end: auto;
  }

  cr-icon-button {
    margin: 0;
  }

  .activity-table-headings {
    width: var(--activity-log-call-and-count-width);
  }

  #activity-list {
    overflow-y: auto;
  }

  #activity-type {
    flex: 0 var(--activity-type-width);
  }

  #activity-key {
    flex: 1;
    margin-inline-start: 10px;
  }

  #activity-count {
    flex: 0 var(--activity-count-width);
    text-align: end;
  }
</style>
<div class="activity-subpage-header">
  <cr-search-field label="$i18n{activityLogSearchLabel}"
    on-search-changed="onSearchChanged_">
  </cr-search-field >
  <cr-button class="clear-activities-button"
      on-click="onClearActivitiesClick_">
    $i18n{clearActivities}
  </cr-button>
  <cr-icon-button id="more-actions" iron-icon="cr:more-vert"
      title="$i18n{activityLogMoreActionsLabel}"
      on-click="onMoreActionsClick_"></cr-icon-button>
  <cr-action-menu role-description="$i18n{menu}">
    <button id="expand-all-button" class="dropdown-item"
        on-click="onExpandAllClick_">
      $i18n{activityLogExpandAll}
    </button>
    <button id="collapse-all-button" class="dropdown-item"
        on-click="onCollapseAllClick_">
      $i18n{activityLogCollapseAll}
    </button>
    <button id="export-button" class="dropdown-item"
        on-click="onExportClick_">
      $i18n{activityLogExportHistory}
    </button>
  </cr-action-menu>
</div>
<div id="loading-activities" class="activity-message"
    hidden$="[[!shouldShowLoadingMessage_(
        pageState_)]]">
  <span>$i18n{loadingActivities}</span>
</div>
<div id="no-activities" class="activity-message"
    hidden$="[[!shouldShowEmptyActivityLogMessage_(
        pageState_, activityData_)]]">
  <span>$i18n{noActivities}</span>
</div>
<div class="activity-table-headings"
    hidden$="[[!shouldShowActivities_(pageState_, activityData_)]]">
  <span id="activity-type">$i18n{activityLogTypeColumn}</span>
  <span id="activity-key">$i18n{activityLogNameColumn}</span>
  <span id="activity-count">$i18n{activityLogCountColumn}</span>
</div>
<div id="activity-list"
    hidden$="[[!shouldShowActivities_(pageState_, activityData_)]]">
  <template is="dom-repeat" items="[[activityData_]]">
    <activity-log-history-item data="[[item]]">
    </activity-log-history-item>
  </template>
</div>