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HTML Comments
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This can be used to remeber things you don't want other people to see


Viewing Source Code

Have you ever wondered how somebody did something exremely amusing or amazing on their website?
Well you can see how they did it by right clicking and then pressing the 'View Source' option

Line Breaks
<br> Stands for breakline they can be used in paragrapghs when you want a pragrapgh to go the line down below it without actually making it to the end of the current line