Divider: Add accessibility notes to divider

src/_components/divider.md

@@ -7,6 +7,10 @@ intro-text: "Dividers are used sparingly to separate significant sections of con
 status: use-best-practice
 web: true
 mobile-app: false
+anchors:
+  - anchor: Example
+  - anchor: Usage
+  - anchor: Accessibility considerations
 ---
 
 ## Example
@@ -24,5 +28,24 @@ mobile-app: false
 
 ### When to consider something else
 
-- Avoid using divider between short, individual items that are in close proximity with one another, _unless_ they are separating navigation links. Consider using white space or headers instead to create vertical separation.  
-- Use a background color box or card to separate a chunk of interactive elements, like search controls, from a list of search results.
+* **Short items in close proximity.** Avoid using a divider between short, individual items that are close to one another, _unless_ they separate navigation links. Consider using white space or headers instead to create vertical separation.
+* **Grouped interactive elements.** Use a background color box or card to separate a chunk of interactive elements, like search controls, from a list of search results.
+
+### How this component works
+
+The Divider component creates a horizontal rule between sections of content. Use it to separate distinct groups of information when spacing or headings alone don't provide enough visual separation.
+
+In most cases, dividers are decorative. If a divider communicates a meaningful change in topic or structure, don't hide it from assistive technology.
+## Accessibility considerations
+
+### Decorative vs semantic dividers
+
+Not all dividers should be announced to screen readers. Most dividers are decorative when used alongside headings or within well-structured content.
+
+**Use `aria-hidden="true"` for decorative dividers when:**
+- The divider only provides visual separation
+- Content structure is already clear through headings or other markup
+
+**Do not use `aria-hidden="true"` for semantic dividers when:**
+- The divider marks a significant topic change meaningful to non-visual users
+- The divider is the primary indicator of a content boundary