My DH helped me learn how to do it the other day when I asked. It was a treat to myself for learning PowerPoint :-) Now I just hope I can come up with another example to use.
He said it was my first use of HTML...hypertext markup language.
Like: I have my sewing room
If anyone else is interested... I don't seem to be able to type the explanation...it keeps just crossing out the words! But I learned by googling the word strikeout and another person's blog came up with the explanation.