Bold, Underline, Italics, Strikethrough

Bold

<b>Pink Squirrels</b> will look like:
Pink Squirrels

Underline

<u>Pink Squirrels</u> will look like:
Pink Squirrels

Italics

<i>Pink Squirrels</i> will look like:
Pink Squirrels

Strikethrough

<s>Pink Squirrels</s> will look like:
Pink Squirrels
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Notice that <b> adds boldface. It continues until </b> cancels this function.
You can even try mixing them up:
<b><i>Pink Squirrels</i></b> will look like:
Pink Squirrels