EXAMPLE ONE: Inserting a horizontal line

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The HTML would look something like this:
<hr>

EXAMPLE TWO: Changing the width of a horizontal line

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The HTML would look something like this:
<hr width="50%">

EXAMPLE THREE: Changing the size of a horizontal line

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The HTML would look something like this:
<hr size="10">

EXAMPLE FOUR: Changing the colour of a horizontal line

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The HTML would look something like this:
<hr color="hotpink">