Found the following HTML validation problems:
Callback.html:152:1 (Callback.Rd:97): Warning: <h5> anchor "Usage" already defined
Callback.html:158:1 (Callback.Rd:101): Warning: <h5> anchor "Arguments" already defined
Callback.html:181:1 (Callback.Rd:114): Warning: <h5> anchor "Usage" already defined
Callback.html:187:1 (Callback.Rd:118): Warning: <h5> anchor "Arguments" already defined
Callback.html:210:1 (Callback.Rd:131): Warning: <h5> anchor "Usage" already defined
Callback.html:226:1 (Callback.Rd:141): Warning: <h5> anchor "Usage" already defined
Callback.html:232:1 (Callback.Rd:145): Warning: <h5> anchor "Arguments" already defined
Callback.html:259:1 (Callback.Rd:162): Warning: <h5> anchor "Usage" already defined
Callback.html:265:1 (Callback.Rd:166): Warning: <h5> anchor "Arguments" already defined
Context.html:133:1 (Context.Rd:103): Warning: <h5> anchor "Usage" already defined
Context.html:139:1 (Context.Rd:107): Warning: <h5> anchor "Arguments" already defined
Context.html:162:1 (Context.Rd:120): Warning: <h5> anchor "Usage" already defined
Context.html:178:1 (Context.Rd:130): Warning: <h5> anchor "Usage" already defined
Context.html:184:1 (Context.Rd:134): Warning: <h5> anchor "Arguments" already defined
Dictionary.html:137:1 (Dictionary.Rd:78): Warning: <h5> anchor "Usage" already defined
Dictionary.html:166:1 (Dictionary.Rd:95): Warning: <h5> anchor "Usage" already defined
Dictionary.html:183:1 (Dictionary.Rd:106): Warning: <h5> anchor "Usage" already defined
Dictionary.html:189:1 (Dictionary.Rd:110): Warning: <h5> anchor "Arguments" already defined
Dictionary.html:219:1 (Dictionary.Rd:126): Warning: <h5> anchor "Usage" already defined
Dictionary.html:225:1 (Dictionary.Rd:130): Warning: <h5> anchor "Arguments" already defined
Dictionary.html:238:1 (Dictionary.Rd:137): Warning: <h5> anchor "Returns" already defined
Dictionary.html:256:1 (Dictionary.Rd:147): Warning: <h5> anchor "Usage" already defined
Dictionary.html:262:1 (Dictionary.Rd:151): Warning: <h5> anchor "Arguments" already defined
Dictionary.html:281:1 (Dictionary.Rd:164): Warning: <h5> anchor "Returns" already defined
Dictionary.html:299:1 (Dictionary.Rd:174): Warning: <h5> anchor "Usage" already defined
Dictionary.html:305:1 (Dictionary.Rd:178): Warning: <h5> anchor "Arguments" already defined
Dictionary.html:321:1 (Dictionary.Rd:188): Warning: <h5> anchor "Returns" already defined
Dictionary.html:339:1 (Dictionary.Rd:198): Warning: <h5> anchor "Usage" already defined
Dictionary.html:345:1 (Dictionary.Rd:202): Warning: <h5> anchor "Arguments" already defined
Dictionary.html:367:1 (Dictionary.Rd:218): Warning: <h5> anchor "Returns" already defined
Dictionary.html:384:1 (Dictionary.Rd:227): Warning: <h5> anchor "Usage" already defined
Dictionary.html:390:1 (Dictionary.Rd:231): Warning: <h5> anchor "Arguments" already defined
Dictionary.html:404:1 (Dictionary.Rd:239): Warning: <h5> anchor "Returns" already defined
Dictionary.html:421:1 (Dictionary.Rd:248): Warning: <h5> anchor "Usage" already defined
Dictionary.html:427:1 (Dictionary.Rd:252): Warning: <h5> anchor "Arguments" already defined
Dictionary.html:441:1 (Dictionary.Rd:260): Warning: <h5> anchor "Returns" already defined
Dictionary.html:458:1 (Dictionary.Rd:269): Warning: <h5> anchor "Usage" already defined
Dictionary.html:464:1 (Dictionary.Rd:273): Warning: <h5> anchor "Arguments" already defined
compat-map.html:219:1 (compat-map.Rd:131): Warning: missing </ul> before </div>
nin.html:52:1 (nin.Rd:14): Warning: missing </ul> before </div>
strip_srcrefs.html:55:1 (strip_srcrefs.Rd:14): Warning: missing </ul> before </div>