do not place block-elements inside inline-elements

Signed-off-by: Christoph Jaeger <email@christophjaeger.info>
be consistent in specifying void elements

Signed-off-by: Christoph Jaeger <email@christophjaeger.info>
prevent search engines from showing a cached copy

Signed-off-by: Christoph Jaeger <email@christophjaeger.info>