getTabHolder () {
    const html = [
      '<div class="col s2">',
      '   <ul class="tabs" style="height: auto; margin-top: 0.82rem; -ms-flex-direction: column; -webkit-flex-direction: column; flex-direction: column; display: -webkit-flex; display: flex;">',
      '   </ul>',
      '</div>',
      '<div class="col s10">',
      '<div>'
    ].join('\n')

    const el = document.createElement('div')
    el.classList.add('row', 'card-panel')
    el.innerHTML = html
    return el
  }
Gets the tab holder element.

@returns {HTMLElement} The tab holder component.
@see https://github.com/Dogfalo/materialize/issues/2542#issuecomment-233458602