feat: Add shouldExcludeFromA11yTree

Author: eps1lon

docs/dom-testing-library/api-helpers.md

@@ -77,7 +77,8 @@ for other popular assertion libraries:
 
 - [chai-dom](https://github.com/nathanboktae/chai-dom)
 
-If you're aware of some other alternatives, please [make a pull request](https://github.com/testing-library/testing-library-docs/pulls)
+If you're aware of some other alternatives, please
+[make a pull request](https://github.com/testing-library/testing-library-docs/pulls)
 and add it here!
 
 ## `getNodeText`
@@ -185,6 +186,19 @@ console.log(getRoles(nav))
 // }
 ```
 
+## `shouldExcludeFromA11yTree`
+
+This function will compute if the given element should be excluded from the
+accessibility API by the browser. It implements every **MUST** criteria from
+https://www.w3.org/TR/wai-aria-1.2/#tree_exclusion with the exception of
+checking the `role` attribute.
+
+It is defined as:
+
+```typescript
+function shouldExcludeFromA11yTree(element: Element): boolean
+```
+
 ## Debugging
 
 When you use any `get` calls in your test cases, the current state of the