This is a test file with some referenced equations, line

<div>

+:-------------------------------------------------------------:+-----:+
| $$ this $$                                                    | $$(  |
|                                                               | 1)$$ |
+---------------------------------------------------------------+------+

</div>

Some equations might be inside of text,

<div>

+:-------------------------------------------------------------:+-----:+
| $$ for example $$                                             | $$(  |
|                                                               | 2)$$ |
+---------------------------------------------------------------+------+

</div>

this one.

Some equations might be on start of paragraphs:

<div>

+:-------------------------------------------------------------:+-----:+
| $$ start $$                                                   | $$(  |
|                                                               | 3)$$ |
+---------------------------------------------------------------+------+

</div>

of paragraph.

Other might be on separate paragraphs of their own:

<div>

+:-------------------------------------------------------------:+-----:+
| $$ separate $$                                                | $$(  |
|                                                               | 4)$$ |
+---------------------------------------------------------------+------+

</div>

Some of those can be labelled:

This is a test file with some referenced equations, line

::: {#eq:0}
+:-------------------------------------------------------------:+-----:+
| $$ this $$                                                    | $$(  |
|                                                               | 5)$$ |
+---------------------------------------------------------------+------+
:::

Some equations might be inside of text,

::: {#eq:1}
+:-------------------------------------------------------------:+-----:+
| $$ for example $$                                             | $$(  |
|                                                               | 6)$$ |
+---------------------------------------------------------------+------+
:::

this one.

Some equations might be on start of paragraphs:

::: {#eq:2}
+:-------------------------------------------------------------:+-----:+
| $$ start $$                                                   | $$(  |
|                                                               | 7)$$ |
+---------------------------------------------------------------+------+
:::

of paragraph.

Other might be on separate paragraphs of their own:

::: {#eq:3}
+:-------------------------------------------------------------:+-----:+
| $$ separate $$                                                | $$(  |
|                                                               | 8)$$ |
+---------------------------------------------------------------+------+
:::

Then they can be referenced:

Individually eq. 5, eq. 6, eq. 7, eq. 8

Or in groups eqns. 5, 6, 8

Groups will be compacted eqns. 5-8