CSS: List using a counter that starts with “0” and uses “decimal-leading-zero”

gistfile1.txt

/* CSS */

.Chapters {
	column-count: 2;
	counter-reset: toc -1;
}

.Chapter {
	counter-increment: toc;
	list-style-type: none;
}

.Chapter::before {
	content: counter(toc, decimal-leading-zero) ".";
}


/* HTML */

<ol class="Chapters">
	<li class="Chapter">Prologue</li>
	<li class="Chapter">Chapter 1</li>
	<li class="Chapter">Chapter 2</li>
	<li class="Chapter">Chapter 3</li>
	<li class="Chapter">Chapter 4</li>
	<li class="Chapter">Chapter 5</li>
	<li class="Chapter">Chapter 6</li>
	<li class="Chapter">Chapter 7</li>
	<li class="Chapter">Chapter 8</li>
	<li class="Chapter">Chapter 9</li>
	<li class="Chapter">Chapter 10</li>
	<li class="Chapter">Chapter 11</li>
	<li class="Chapter">Chapter 12</li>
	<li class="Chapter">Chapter 13</li>
	<li class="Chapter">Chapter 14</li>
	<li class="Chapter">Chapter 15</li>
	<li class="Chapter">Chapter 16</li>
	<li class="Chapter">Chapter 17</li>
	<li class="Chapter">Chapter 18</li>
</ol>