Found the following HTML validation problems:
adminlte_color.html:56:44 (adminlte_color.Rd:27): Warning: trimming empty <span>
adminlte_color.html:60:36 (adminlte_color.Rd:29): Warning: trimming empty <span>
adminlte_color.html:64:39 (adminlte_color.Rd:31): Warning: trimming empty <span>
adminlte_color.html:68:35 (adminlte_color.Rd:33): Warning: trimming empty <span>
adminlte_color.html:72:40 (adminlte_color.Rd:35): Warning: trimming empty <span>
adminlte_color.html:76:21 (adminlte_color.Rd:37): Warning: trimming empty <span>
adminlte_color.html:80:21 (adminlte_color.Rd:39): Warning: trimming empty <span>
adminlte_color.html:84:21 (adminlte_color.Rd:41): Warning: trimming empty <span>
adminlte_color.html:88:22 (adminlte_color.Rd:43): Warning: trimming empty <span>
adminlte_color.html:92:21 (adminlte_color.Rd:45): Warning: trimming empty <span>
adminlte_color.html:96:23 (adminlte_color.Rd:47): Warning: trimming empty <span>
adminlte_color.html:100:24 (adminlte_color.Rd:49): Warning: trimming empty <span>
adminlte_color.html:104:23 (adminlte_color.Rd:51): Warning: trimming empty <span>
adminlte_color.html:108:23 (adminlte_color.Rd:53): Warning: trimming empty <span>
adminlte_color.html:112:22 (adminlte_color.Rd:55): Warning: trimming empty <span>
adminlte_color.html:116:21 (adminlte_color.Rd:57): Warning: trimming empty <span>
bs3-variables.html:342:28 (bs3-variables.Rd:316): Warning: trimming empty <span>
bs3-variables.html:346:28 (bs3-variables.Rd:318): Warning: trimming empty <span>
bs3-variables.html:350:25 (bs3-variables.Rd:320): Warning: trimming empty <span>
bs3-variables.html:354:28 (bs3-variables.Rd:322): Warning: trimming empty <span>
bs3-variables.html:358:27 (bs3-variables.Rd:324): Warning: trimming empty <span>
bs4dash_color.html:59:13 (bs4dash_color.Rd:31): Warning: trimming empty <span>
bs4dash_color.html:63:13 (bs4dash_color.Rd:33): Warning: trimming empty <span>
bs4dash_color.html:67:13 (bs4dash_color.Rd:35): Warning: trimming empty <span>
bs4dash_color.html:71:13 (bs4dash_color.Rd:37): Warning: trimming empty <span>
bs4dash_color.html:75:13 (bs4dash_color.Rd:39): Warning: trimming empty <span>
bs4dash_color.html:79:13 (bs4dash_color.Rd:41): Warning: trimming empty <span>
bs4dash_color.html:83:13 (bs4dash_color.Rd:43): Warning: trimming empty <span>
bs4dash_color.html:87:13 (bs4dash_color.Rd:45): Warning: trimming empty <span>
bs4dash_color.html:91:13 (bs4dash_color.Rd:47): Warning: trimming empty <span>
bs4dash_color.html:95:13 (bs4dash_color.Rd:49): Warning: trimming empty <span>
bs4dash_color.html:99:13 (bs4dash_color.Rd:51): Warning: trimming empty <span>
bs4dash_color.html:103:13 (bs4dash_color.Rd:53): Warning: trimming empty <span>
bs4dash_color.html:107:13 (bs4dash_color.Rd:55): Warning: trimming empty <span>
bs4dash_color.html:111:13 (bs4dash_color.Rd:57): Warning: trimming empty <span>
bs4dash_color.html:115:13 (bs4dash_color.Rd:59): Warning: trimming empty <span>
bs4dash_color.html:119:13 (bs4dash_color.Rd:61): Warning: trimming empty <span>
bs4dash_color.html:123:13 (bs4dash_color.Rd:63): Warning: trimming empty <span>
bs4dash_color.html:127:13 (bs4dash_color.Rd:65): Warning: trimming empty <span>
bs4dash_color.html:131:13 (bs4dash_color.Rd:67): Warning: trimming empty <span>
bs4dash_color.html:135:13 (bs4dash_color.Rd:69): Warning: trimming empty <span>
bs4dash_status.html:47:13 (bs4dash_status.Rd:19): Warning: trimming empty <span>
bs4dash_status.html:51:13 (bs4dash_status.Rd:21): Warning: trimming empty <span>
bs4dash_status.html:55:13 (bs4dash_status.Rd:23): Warning: trimming empty <span>
bs4dash_status.html:59:13 (bs4dash_status.Rd:25): Warning: trimming empty <span>
bs4dash_status.html:63:13 (bs4dash_status.Rd:27): Warning: trimming empty <span>
bs4dash_status.html:67:13 (bs4dash_status.Rd:29): Warning: trimming empty <span>
bs4dash_status.html:71:13 (bs4dash_status.Rd:31): Warning: trimming empty <span>
bs4dash_status.html:75:13 (bs4dash_status.Rd:33): Warning: trimming empty <span>