[fxtf-drafts] [compositing] Consider tagging the <blend-mode> and <isolation-mode> production rules

tidoust has just created a new issue for https://github.com/w3c/fxtf-drafts:

== [compositing] Consider tagging the <blend-mode> and <isolation-mode> production rules ==
There is no easy way to identify the [`<blend-mode>` definition](https://drafts.fxtf.org/compositing-1/#ltblendmodegt) as a production rule, making it hard to extract the rule automatically. Most other CSS specs flag these production rules one way or the other, e.g. with a `css` class on the `<dfn>` tag, or with a `prod` class on the `<pre>` tag.

Same thing for the `isolation-mode` definition.

Please view or discuss this issue at https://github.com/w3c/fxtf-drafts/issues/302 using your GitHub account