Found the following HTML validation problems:
Chat.html:188:1 (Chat.Rd:92): Warning: <h5> anchor "Usage" already defined
Chat.html:194:1 (Chat.Rd:96): Warning: <h5> anchor "Arguments" already defined
Chat.html:218:1 (Chat.Rd:110): Warning: <h5> anchor "Usage" already defined
Chat.html:224:1 (Chat.Rd:114): Warning: <h5> anchor "Arguments" already defined
Chat.html:247:1 (Chat.Rd:127): Warning: <h5> anchor "Usage" already defined
Chat.html:253:1 (Chat.Rd:131): Warning: <h5> anchor "Arguments" already defined
Chat.html:278:1 (Chat.Rd:146): Warning: <h5> anchor "Usage" already defined
Chat.html:294:1 (Chat.Rd:156): Warning: <h5> anchor "Usage" already defined
Chat.html:310:1 (Chat.Rd:166): Warning: <h5> anchor "Usage" already defined
Chat.html:316:1 (Chat.Rd:170): Warning: <h5> anchor "Arguments" already defined
Chat.html:341:1 (Chat.Rd:185): Warning: <h5> anchor "Usage" already defined
Chat.html:347:1 (Chat.Rd:189): Warning: <h5> anchor "Arguments" already defined
Chat.html:371:1 (Chat.Rd:203): Warning: <h5> anchor "Usage" already defined
Chat.html:377:1 (Chat.Rd:207): Warning: <h5> anchor "Arguments" already defined
Chat.html:402:1 (Chat.Rd:222): Warning: <h5> anchor "Usage" already defined
Chat.html:408:1 (Chat.Rd:226): Warning: <h5> anchor "Arguments" already defined
Chat.html:441:1 (Chat.Rd:245): Warning: <h5> anchor "Usage" already defined
Chat.html:447:1 (Chat.Rd:249): Warning: <h5> anchor "Arguments" already defined
Chat.html:475:1 (Chat.Rd:267): Warning: <h5> anchor "Usage" already defined
Chat.html:481:1 (Chat.Rd:271): Warning: <h5> anchor "Arguments" already defined
Chat.html:518:1 (Chat.Rd:298): Warning: <h5> anchor "Usage" already defined
Chat.html:524:1 (Chat.Rd:302): Warning: <h5> anchor "Arguments" already defined
Chat.html:561:1 (Chat.Rd:329): Warning: <h5> anchor "Usage" already defined
Chat.html:567:1 (Chat.Rd:333): Warning: <h5> anchor "Arguments" already defined
Chat.html:599:1 (Chat.Rd:355): Warning: <h5> anchor "Usage" already defined
Chat.html:605:1 (Chat.Rd:359): Warning: <h5> anchor "Arguments" already defined
Chat.html:634:1 (Chat.Rd:378): Warning: <h5> anchor "Usage" already defined
Chat.html:644:1 (Chat.Rd:386): Warning: <h5> anchor "Arguments" already defined
Chat.html:678:1 (Chat.Rd:410): Warning: <h5> anchor "Usage" already defined
Chat.html:684:1 (Chat.Rd:414): Warning: <h5> anchor "Arguments" already defined
Chat.html:708:1 (Chat.Rd:428): Warning: <h5> anchor "Usage" already defined
Chat.html:714:1 (Chat.Rd:432): Warning: <h5> anchor "Arguments" already defined
Chat.html:737:1 (Chat.Rd:445): Warning: <h5> anchor "Usage" already defined
Chat.html:753:1 (Chat.Rd:455): Warning: <h5> anchor "Usage" already defined
Chat.html:770:1 (Chat.Rd:466): Warning: <h5> anchor "Usage" already defined
Chat.html:776:1 (Chat.Rd:470): Warning: <h5> anchor "Arguments" already defined
Chat.html:799:1 (Chat.Rd:483): Warning: <h5> anchor "Usage" already defined
Chat.html:805:1 (Chat.Rd:487): Warning: <h5> anchor "Arguments" already defined
Chat.html:819:1 (Chat.Rd:495): Warning: <h5> anchor "Returns" already defined
Chat.html:836:1 (Chat.Rd:504): Warning: <h5> anchor "Usage" already defined
Chat.html:842:1 (Chat.Rd:508): Warning: <h5> anchor "Arguments" already defined
Chat.html:856:1 (Chat.Rd:516): Warning: <h5> anchor "Returns" already defined
Chat.html:874:1 (Chat.Rd:526): Warning: <h5> anchor "Usage" already defined
Chat.html:880:1 (Chat.Rd:530): Warning: <h5> anchor "Arguments" already defined
Chat.html:903:1 (Chat.Rd:543): Warning: <h5> anchor "Usage" already defined
Chat.html:909:1 (Chat.Rd:547): Warning: <h5> anchor "Arguments" already defined
Chat.html:932:1 (Chat.Rd:560): Warning: <h5> anchor "Usage" already defined
Chat.html:938:1 (Chat.Rd:564): Warning: <h5> anchor "Arguments" already defined
chat-any.html:86:1 (chat-any.Rd:34): Warning: missing </ul> before </div>
contents_record.html:70:1 (contents_record.Rd:20): Warning: missing </ul> before </div>
deprecated.html:88:1 (deprecated.Rd:24): Warning: missing </ul> before </div>
has_credentials.html:46:1 (has_credentials.Rd:10): Warning: missing </ul> before </div>
params.html:99:1 (params.Rd:39): Warning: missing </ul> before </div>