Ordered lists in HMTL can be reversed. You can switch from increasing order to decreasing order with the reversed attribute on the ol tag.

So this is the default order:

<h2>So how do you make gingerbread cookies? It’s simple!</h2>
<ol>
	<li>Whisk together your dry ingredients.</li>
	<li>Beat the dough.</li>
	<li>Chill the dough.</li>
	<li>Roll and cut the dough.</li>
	<li>Bake.</li>
	<li>Decorate.</li>
</ol>

With the reversed attribute, you can change the order to be counting down:

<h2>Top 6 Christmas Songs</h2>
<ol reversed>
	<li>Judy Garland, “Have Yourself a Merry Little Christmas” (1944)</li>
	<li>Andy Williams, “It’s the Most Wonderful Time of the Year” (1963)</li>
	<li>José Feliciano, “Feliz Navidad” (1970)</li>
	<li>Bing Crosby, “White Christmas” (1947)</li>
	<li>Wham!, “Last Christmas” (1984)</li>
	<li>Mariah Carey, “All I Want For Christmas Is You” (1994)</li>
</ol>