chromium/chrome/browser/resources/key_value_pair_viewer_shared/key_value_pair_viewer.html

<div id="second-row">
  <h2 id="tableTitle">$i18n{tableTitle}</h2>
  <button id="expandAll" @click="${this.onExpandAllClick_}">
    $i18n{expandAllBtn}
  </button>
  <button id="collapseAll" @click="${this.onCollapseAllClick_}">
    $i18n{collapseAllBtn}
  </button>
</div>

<p id="status"></p>
<div id="spinner" id="spinner"></div>

<div id="table">
  ${this.entries.map(item => html`
    <key-value-pair-entry .entry="${item}" role="row"></key-value-pair-entry>
  `)}
</div>