[skunkworks]

Karellen,

Yes, it's an epub. In my zeal to post, I neglected to mention that. :-)

The HTML looks like this:
<h1 id="id_Toc525564898" class="block_12">Chapter 1</h1>

However, I don't see h1 in stylesheet.css. It is included below.

Spoiler:

.block_ {
display: block;
font-size: 1.29167em;
line-height: 1.2;
text-align: center;
text-indent: 0;
margin: 150pt 0 0;
padding: 0;
}
.block_1 {
display: block;
font-size: 1.29167em;
line-height: 1.2;
text-align: center;
text-indent: 0;
margin: 0;
padding: 0;
}
.block_2 {
display: block;
font-family: serif;
font-size: 0.75em;
text-align: center;
text-indent: 0;
margin: 0;
padding: 0;
}
.block_3 {
display: block;
font-size: 1.29167em;
line-height: 1.2;
text-indent: 21.6pt;
margin: 0;
padding: 0;
}
.block_4 {
color: #000;
display: block;
font-size: 0.83333em;
text-align: center;
text-indent: 0;
margin: 0;
padding: 0;
}
.block_5 {
color: #000;
display: block;
line-height: 1.2;
text-align: center;
text-indent: 0;
margin: 0;
padding: 0;
}
.block_6 {
display: block;
line-height: 1.2;
text-align: center;
text-indent: 0;
margin: 0;
padding: 0;
}
.block_7 {
display: block;
font-family: serif;
font-size: 0.75em;
text-indent: 0;
margin: 0;
padding: 0;
}
.block_8 {
color: #000;
display: block;
line-height: 1.2;
text-indent: 0;
margin: 0;
padding: 0;
}
.block_9 {
display: block;
line-height: 1.2;
text-align: justify;
text-indent: 0;
margin: 0;
padding: 0;
}
.block_10 {
display: block;
line-height: 1.2;
text-indent: 0;
margin: 0;
padding: 0;
}
.block_11 {
display: block;
line-height: 1.2;
text-indent: 21.6pt;
margin: 0;
padding: 0;
}
.block_12 {
display: block;
font-size: 0.83333em;
font-weight: bold;
page-break-after: avoid;
page-break-inside: avoid;
text-align: center;
text-indent: 0;
margin: 0 0 18pt;
padding: 0;
}
.block_13 {
display: block;
line-height: 1.2;
text-align: justify;
text-indent: 21.6pt;
margin: 0;
padding: 0;
}
.block_14 {
display: block;
font-weight: bold;
line-height: 1.2;
text-align: justify;
text-indent: 21.6pt;
margin: 0;
padding: 0;
}
.block_15 {
display: block;
line-height: 1.2;
text-align: justify;
text-indent: 21.6pt;
margin: 0;
padding: 0;
}
.block_16 {
display: block;
font-weight: bold;
line-height: 1.2;
text-align: justify;
text-indent: 21.6pt;
margin: 0;
padding: 0;
}
.block_17 {
display: block;
font-family: serif;
font-size: 0.75em;
text-align: justify;
text-indent: 21.6pt;
margin: 0;
padding: 0;
}
.block_18 {
display: block;
font-weight: bold;
line-height: 1.2;
text-align: justify;
text-indent: 0;
margin: 0;
padding: 0;
}
.block_19 {
display: block;
font-family: serif;
font-size: 0.75em;
text-align: justify;
text-indent: 0;
margin: 0;
padding: 0;
}
.block_20 {
display: block;
line-height: 1.2;
text-align: justify;
text-indent: 21.6pt;
margin: 0 0 10pt;
padding: 0;
}
.calibre {
display: block;
font-family: "Times New Roman", serif;
font-size: 1em;
padding-left: 0;
padding-right: 0;
margin: 0 5pt;
}
.calibre1 {
height: 24pt;
width: 134pt;
}
.calibre2 {
font-style: italic;
line-height: 1.2;
}
.calibre3 {
display: block;
line-height: 1.2;
margin: 0;
padding: 0;
}
.calibre4 {
font-weight: bold;
line-height: 1.2;
}
.calibre5 {
line-height: 1.2;
}
.calibre6 {
font-size: 1em;
line-height: normal;
vertical-align: super;
}
.text_ {
color: #00F;
line-height: 1.2;
text-decoration: underline;
}
.text_1 {
color: #808080;
line-height: 1.2;
}
.text_2 {
font-weight: bold;
line-height: 1.2;
text-decoration: underline;
}