test1

See: http://www.fooa.com/test1 http://www.fooa.com/_test1 https://www.foob.com/test1 http://www.fooc.com/test1 test1

Also piggyback a few tests for https://github.com/dlang/dmd/pull/6989

not_a_tag_because_it_does_not_start_with_uppercase:

not_a_tag_because_no_whitespace_after_colon:x

TagGalore: yes this is a tag

MoreTag: yes the above is also a tag