Refactor code-style

*   Add more docs to JSDoc

Author: wooorm

.github/workflows/main.yml

@@ -18,4 +18,4 @@ jobs:
       matrix:
         node:
           - lts/fermium
-          - node
+          - node

index.js

@@ -1,13 +1,19 @@
 /**
- * @typedef {import('hast').Element & {tagName: 'article'|'aside'|'nav'|'section'}} Sectioning
- * @typedef {import('hast-util-is-element').AssertPredicate<Sectioning>} AssertSectioning
+ * @typedef {import('hast').Element} Element
  */
 
 import {convertElement} from 'hast-util-is-element'
 
 /**
- * Check if a node is a sectioning element.
- * @type {AssertSectioning}
+ * Check if a node is sectioning content.
+ *
+ * @type {import('hast-util-is-element').AssertPredicate<Element & {tagName: 'article' | 'aside' | 'nav' | 'section'}>}
+ * @param value
+ *   Thing to check (typically `Node`).
+ * @returns
+ *   Whether `value` is an element considered sectioning content.
+ *
+ *   The elements `article`, `aside`, `nav`, and `section` are sectioning.
  */
 // @ts-expect-error Sure, the assertion matches.
 export const sectioning = convertElement(['article', 'aside', 'nav', 'section'])

readme.md

@@ -218,6 +218,6 @@ abide by its terms.
 
 [element]: https://github.com/syntax-tree/hast#element
 
-[spec]: https://html.spec.whatwg.org/#sectioning-content
+[spec]: https://html.spec.whatwg.org/multipage/dom.html#sectioning-content
 
 [xss]: https://en.wikipedia.org/wiki/Cross-site_scripting