chromium/ui/file_manager/file_manager/foreground/js/ui/banners/drive_low_shared_drive_space_banner.html

<warning-banner role="banner" class="tast-drive-low-shared-drive-space">
  <span slot="text"></span>
  <cr-button slot="extra-button" href="$i18n{GOOGLE_DRIVE_MANAGE_STORAGE_URL}">
    $i18n{LEARN_MORE_LABEL}
  </cr-button>
  <cr-button slot="dismiss-button" id="dismiss-button">
    $i18n{DRIVE_WELCOME_DISMISS}
  </cr-button>
</warning-banner>