docs(Skeleton): Fix formatting in README
@@ -279,8 +279,8 @@ Conventions:
There are several additional selectors which are not found as the Stencila Schema definitions. These are:
| Selector | Description | Target |
-| :------------------ | :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | :---------------------------------------------------------------------------------------------------------------------------- |
-| `:--root` | It maps to the root element generated by Encoda. This is done to avoid potential clashes with external stylesheets, and to ensure that Thema only styles semantically annotated content. | `[data-itemscope=root]` |
+| :------------------ | :----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | :---------------------------------------------------------------------------------------------------------------------------- |
+| `:--root` | Used in place of the [`:root` CSS pseudo selector](https://developer.mozilla.org/en-US/docs/Web/CSS/:root). It maps to the root element [generated by Encoda](https://github.com/stencila/encoda/commit/2859e329345b6d0b6f572d64f8bd8cacf3637fc4). This is done to avoid potential clashes with external stylesheets, and to ensure that Thema only styles semantically annotated content. | `[data-itemscope=root]` |
| `:--CodeBlockTypes` | Block level code elements | `:--CodeBlock`, `:--CodeChunk` |
| `:--CodeTypes` | Inline level code elements | `:--CodeBlock`, `:--CodeChunk`, `:--Code`, `:--CodeError`, `:--CodeExpression`, `:--CodeFragment`, `:--SoftwareSourceCode` |
| `:--ListTypes` | List elements, both ordered and unordered, as well as other lists such as author affiliations and article references | `:--Article:--root > :--affiliations`, `:--Collection`, `:--List`, `:--references > ol` |
