Update DOM.md

sadanandpai · web-flow · commit 9b178021dd1a · 2021-11-09T09:15:05.000+05:30
diff --git a/challenges/DOM.md b/challenges/DOM.md
@@ -291,6 +291,8 @@ function getElementsByTagName(root, tagName) {
 ###### References
 - https://developer.mozilla.org/en-US/docs/Web/API/Document/getElementsByTagName
 
+<br>
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 #### Q10
 ### Implement a function to check if a given DOM tree has duplicate IDs
 
