Found the following HTML validation problems:
ANCdata.html:19:1 (ANCdata.Rd:4): Warning: <h2> attribute "id" has invalid value "Antenatal care data"
ANCtable.html:19:1 (ANCtable.rd:4): Warning: <h2> attribute "id" has invalid value "ANC Table"
Attitudes.html:19:1 (Attitudes.rd:4): Warning: <h2> attribute "id" has invalid value "Attitudes dataset"
BP.html:19:1 (BP.rd:4): Warning: <h2> attribute "id" has invalid value "Blood pressure"
Compaq.html:19:1 (Compaq.rd:4): Warning: <h2> attribute "id" has invalid value "Cancer survival"
Decay.html:19:1 (Decay.rd:4): Warning: <h2> attribute "id" has invalid value "Tooth decay"
Ectopic.html:19:1 (Ectopic.Rd:4): Warning: <h2> attribute "id" has invalid value "Ectopic pregnancy"
HW93.html:19:1 (HW93.Rd:4): Warning: <h2> attribute "id" has invalid value "Hookworm 1993"
Hakimi.html:19:1 (Hakimi.rd:4): Warning: <h2> attribute "data'" lacks value
Hakimi.html:19:1 (Hakimi.rd:4): Warning: <h2> proprietary attribute "s"
IudAdmit.html:19:1 (IudAdmit.rd:4): Warning: <h2> attribute "id" has invalid value "IUD trial admission data"
IudDiscontinue.html:19:1 (IudDiscontinue.rd:4): Warning: <h2> attribute "id" has invalid value "IUD trial discontinuation data"
IudFollowup.html:19:1 (IudFollowup.rd:4): Warning: <h2> attribute "id" has invalid value "IUD trial follow-up data"
Marryage.html:19:1 (Marryage.Rd:4): Warning: <h2> attribute "id" has invalid value "Age at marriage"
Outbreak.html:19:1 (Outbreak.rd:4): Warning: <h2> attribute "id" has invalid value "Outbreak investigation"
Planning.html:19:1 (Planning.rd:4): Warning: <h2> attribute "id" has invalid value "Data for cleaning"
SO2.html:19:1 (SO2.Rd:4): Warning: <h2> attribute "id" has invalid value "Air Pollution"
Suwit.html:19:1 (Suwit.Rd:4): Warning: <h2> attribute "id" has invalid value "Hookworm and blood loss"
Timing.html:19:1 (Timing.Rd:4): Warning: <h2> attribute "id" has invalid value "Timing exercise"
VCT.html:19:1 (VCT.rd:4): Warning: <h2> attribute "id" has invalid value "Voluntary counselling and testing"
Vc1to1.html:19:1 (Vc1to1.rd:5): Warning: <h2> attribute "id" has invalid value "Matched case-control study"
Xerop.html:19:1 (Xerop.rd:4): Warning: <h2> attribute "id" has invalid value "Xerophthalmia and respiratory infection"
aggregate.numeric.html:19:1 (aggregate.numeric.rd:3): Warning: <h2> attribute "id" has invalid value "aggregate numeric"
aggregate.plot.html:19:1 (aggregate.plot.rd:3): Warning: <h2> attribute "id" has invalid value "aggregate plot"
bang.html:19:1 (bang.rd:4): Warning: <h2> attribute "id" has invalid value "Bangladesh Fertility Survey"
followup.plot.html:19:1 (followup.plot.rd:3): Warning: <h2> attribute "id" has invalid value "Follow-up Plot"
lsNoFunction.html:19:1 (lsNoFunction.rd:3): Warning: <h2> attribute "id" has invalid value "List non-function objects"
power.for.2means.html:19:1 (power.for.2means.rd:3): Warning: <h2> attribute "id" has invalid value "print power.for.2means"
print.alpha.html:19:1 (print.alpha.rd:3): Warning: <h2> attribute "id" has invalid value "print alpha"
print.cci.html:19:1 (print.cci.rd:3): Warning: <h2> attribute "id" has invalid value "print cci"
print.des.html:19:1 (print.des.rd:3): Warning: <h2> attribute "id" has invalid value "print des"
print.kap.ByCategory.html:19:1 (print.kap.ByCategory.rd:3): Warning: <h2> attribute "id" has invalid value "print kap.ByCategory"
print.kap.table.html:19:1 (print.kap.table.rd:3): Warning: <h2> attribute "id" has invalid value "print kap.table"
print.lrtest.html:19:1 (print.lrtest.rd:3): Warning: <h2> attribute "id" has invalid value "print lrtest"
print.matchTab.html:19:1 (print.matchTab.rd:3): Warning: <h2> attribute "id" has invalid value "print matchTab"
print.n.for.2means.html:19:1 (print.n.for.2means.rd:3): Warning: <h2> attribute "id" has invalid value "print n.for.2means"
print.n.for.2p.html:19:1 (print.n.for.2p.rd:3): Warning: <h2> attribute "id" has invalid value "print n.for.2p"
print.n.for.cluster.2means.html:19:1 (print.n.for.cluster.2means.rd:3): Warning: <h2> attribute "id" has invalid value "print n.for.cluster.2means"
print.n.for.cluster.2p.html:19:1 (print.n.for.cluster.2p.rd:3): Warning: <h2> attribute "id" has invalid value "print n.for.cluster.2p"
print.n.for.equi.2p.html:19:1 (print.n.for.equi.2p.rd:3): Warning: <h2> attribute "id" has invalid value "print n.for.equi.2p"
print.n.for.lqas.html:19:1 (print.n.for.lqas.rd:3): Warning: <h2> attribute "id" has invalid value "print n.for.lqas"
print.n.for.noninferior.2p.html:19:1 (print.n.for.noninferior.2p.rd:3): Warning: <h2> attribute "id" has invalid value "print n.for.noninferior.2p"
print.n.for.survey.html:19:1 (print.n.for.survey.rd:3): Warning: <h2> attribute "id" has invalid value "print n.for.survey"
print.power.for.2p.html:19:1 (print.power.for.2p.rd:3): Warning: <h2> attribute "id" has invalid value "print power.for.2p"
print.statStack.html:19:1 (print.statStack.rd:3): Warning: <h2> attribute "id" has invalid value "print statStack"
print.summ.data.frame.html:19:1 (print.summ.data.frame.rd:3): Warning: <h2> attribute "id" has invalid value "print summ.data.frame"
print.summ.default.html:19:1 (print.summ.default.rd:3): Warning: <h2> attribute "id" has invalid value "print summ.default"
print.tableStack.html:19:1 (print.tableStack.rd:3): Warning: <h2> attribute "id" has invalid value "print tableStack"