This is an H1 header

Let us try to create a table.
12345
678910
1112131415
And follow it with text to see if the line height is correct even if the
actual
text is too high. However now that things are basically working perhaps we can think about releasing this viewer. Here comes a BR:
The following is an HR:
Did it work?
nested tables (outer)
nested tables (inner)
foofee (inner)
foofee (outer)
Now, a very nested table (10 levels!)
A!
fee fai foe fum
fee

non-terminated table
foofee