documentation update

CREDITS.md

@@ -15,18 +15,15 @@ https://bootswatch.com/darkly/
 
 ## JavaScript
 
-https://www.w3schools.com/jsref/met_node_appendchild.asp  
-https://www.w3schools.com/jsref/met_element_setattribute.asp  
-https://www.w3schools.com/jsref/prop_style_marginbottom.asp  
-https://www.w3schools.com/jsref/met_node_removechild.asp  
-https://www.w3schools.com/jsref/prop_textarea_value.asp  
-https://www.w3schools.com/jsref/jsref_length_string.asp  
-https://www.w3schools.com/jsref/met_element_getelementsbytagname.asp  
-https://www.w3schools.com/jsref/met_document_getelementsbyclassname.asp  
-https://www.w3schools.com/js/js_htmldom_css.asp  
-https://www.w3schools.com/js/js_loop_while.asp  
-https://www.w3schools.com/tags/tag_textarea.asp  
+https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/responseText  
+https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/click  
+
+https://www.w3schools.com/jsref/  
+https://www.w3schools.com/js/  
+https://www.w3schools.com/tags/  
 
 https://stackoverflow.com/questions/11080620/how-to-remove-div-elements-in-javascript-using-their-id  
-https://stackoverflow.com/questions/5629684/how-can-i-check-if-an-element-exists-in-the-visible-dom  
 https://stackoverflow.com/questions/17109702/remove-all-stylings-border-glow-from-textarea  
+https://stackoverflow.com/questions/14106501/read-xml-file-using-javascript-from-a-local-folder  
+
+https://code.tutsplus.com/how-to-save-a-file-with-javascript--cms-41105t