Sandbox

.wiki-content h1
{
counter-increment: h1c;
counter-reset: h2c;
}
.wiki-content h1:before

.wiki-content h2
{
counter-increment: h2c;
counter-reset: h3c;
}
.wiki-content h2:before

.wiki-content h3
{
counter-increment: h3c;
counter-reset: h4c;
}

.wiki-content h3:before

.wiki-content h4
{
counter-increment: h4c;
counter-reset: h5c;
}
.wiki-content h4:before

.wiki-content h5
{
counter-increment: h5c;
counter-reset: h6c;
}
.wiki-content h5:before

.wiki-content h6

.wiki-content h6:before

h1 Foo

h2 Bar