docs: Describe and use exported DOMException error code constants

readme.md

@@ -98,23 +98,30 @@ DOM level2 method and attribute:
 			normalize()
 			isSupported(feature, version)
 			hasAttributes()
- * [DOMException](http://www.w3.org/TR/2000/REC-DOM-Level-2-Core-20001113/ecma-script-binding.html)
-   * used as the Error type thrown as part of DOM API:
-	 1. Index size error
-	 2. DOMString size error
-	 3. Hierarchy request error
-	 4. Wrong document
-	 5. Invalid character
-	 6. No data allowed
-	 7. No modification allowed
-	 8. Not found
-	 9. Not supported
-	 10. Attribute in use
-	 11. Invalid state
-	 12. Syntax error
-	 13. Invalid modification
-	 14. Invalid namespace
-	 15. Invalid access
+* [DOMException](http://www.w3.org/TR/2000/REC-DOM-Level-2-Core-20001113/ecma-script-binding.html)
+   The DOMException class has the following constants (and `value` of type `Number`):
+
+  1. `DOMException.INDEX_SIZE_ERR` (`1`)
+  1. `DOMException.DOMSTRING_SIZE_ERR` (`2`)
+  1. `DOMException.HIERARCHY_REQUEST_ERR` (`3`)
+  1. `DOMException.WRONG_DOCUMENT_ERR` (`4`)
+  1. `DOMException.INVALID_CHARACTER_ERR` (`5`)
+  1. `DOMException.NO_DATA_ALLOWED_ERR` (`6`)
+  1. `DOMException.NO_MODIFICATION_ALLOWED_ERR` (`7`)
+  1. `DOMException.NOT_FOUND_ERR` (`8`)
+  1. `DOMException.NOT_SUPPORTED_ERR` (`9`)
+  1. `DOMException.INUSE_ATTRIBUTE_ERR` (`10`)
+  1. `DOMException.INVALID_STATE_ERR` (`11`)
+  1. `DOMException.SYNTAX_ERR` (`12`)
+  1. `DOMException.INVALID_MODIFICATION_ERR` (`13`)
+  1. `DOMException.NAMESPACE_ERR` (`14`)
+  1. `DOMException.INVALID_ACCESS_ERR` (`15`)
+
+   The DOMException object has the following properties:
+   code
+   This property is of type Number.
+
+	 * extends the Error type thrown as part of DOM API:
 
  * [DOMImplementation](http://www.w3.org/TR/2000/REC-DOM-Level-2-Core-20001113/core.html#ID-102161490)
 

test/dom/attr.test.js

@@ -18,7 +18,7 @@ describe('XML attrs', () => {
 		const c = root.ownerDocument.createElement('c')
 		expect(() => {
 			c.setAttributeNode(root.attributes.item(0))
-		}).toThrow(new DOMException(10))
+		}).toThrow(new DOMException(DOMException.INUSE_ATTRIBUTE_ERR))
 	})
 
 	it('can properly set ns attribute', () => {
@@ -39,7 +39,7 @@ describe('XML attrs', () => {
 		const c = root.ownerDocument.createElement('c')
 		expect(() => {
 			c.setAttributeNodeNS(root.attributes.item(0))
-		}).toThrow(new DOMException(10))
+		}).toThrow(new DOMException(DOMException.INUSE_ATTRIBUTE_ERR))
 	})
 
 	it('can properly override attribute', () => {