HTML

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<p style="border-bottom:1px solid black;">1 pixel, solid, black...</p>

<p style="border-bottom:1px dotted black;">1 pixel, dotted, black...</p>

<p style="border-bottom:10px double orange;">10 pixels, double orange...</p>

<p style="border-bottom:1px dashed green;">1 pixel, dashed green...</p>