Run-in
header
Start of block. The run-in header should be inside the
border around this block and there should be no space between the word
"header" and the word "Start", other than the 5px vertical blue border. The
border of the run-in must have no vertical part on the left in the first
line and no vertical part on the right in the second line. The border of the
run-in must not extend outside the border of the block.