testAssertHtmlMismatchTag() {
    setUpAssertHtmlMatches();

    // Should fail due to mismatched tag
    const e =
        assertThrowsJsUnitException(/**
                                       @suppress {checkTypes} suppression added
                                       to enable type checking
                                     */
                                    () => {
                                      testingDom.assertHtmlContentsMatch(
                                          '<span style="display: none; font-size: 2em">' +
                                              '[[IE GECKO]]NonWebKitText<div class="IE"><p class="WEBKIT">' +
                                              '<span class="GECKO"><br class="GECKO WEBKIT">Text</span></p></div>' +
                                              '</span>[[WEBKIT]]Extra',
                                          root);
                                    });
    assertContains('Tag names should match', e.message);
  }
@suppress {checkTypes} suppression added
                                       to enable type checking