Make various corrections to notes

JavaScript/DOM.md

@@ -7,7 +7,7 @@ The document object is *globally available* in the browser. It allows to access
 
 ### Selecting Nodes from the DOM
 
-`getElementById()` and `querySelector()` return a single element.
+`getElementById()` and `querySelector()` return a single element.  
 `getElementsByClassName()`, `getElementsByTagName()`, and `querySelectorAll()` return a collection of elements.
 
 ```js
@@ -16,14 +16,14 @@ Javascript
 var node = document.getElementById('id');
 
 // By Tag Name
-var node = document.getElementsByTagName('tag');
+var nodes = document.getElementsByTagName('tag');
 
 // By Class Name
-var node = document.getElementsByClassName('class');
+var nodes = document.getElementsByClassName('class');
 
 // By CSS Query
 var node = document.querySelector('css-selector');
-var node = document.querySelectorAll('css-selector');
+var nodes = document.querySelectorAll('css-selector');
 ```
 
 ## Manupulating the DOM
@@ -119,7 +119,7 @@ document.createTextNode('text');
 domNode.appendChild(childToAppend);  // insert childTaAppend after domNode
 
 // insert node before domNode
-domNode.insertBEfore(childToInsert, domnode);
+domNode.insertBefore(childToInsert, domnode);
 domNode.parentNode.insertBefore(childToInsert, nodeAfterChild);
 
 // remove a node

JavaScript/Events & Animation.md

@@ -63,6 +63,9 @@ window.setInterval(callbackFunction, delayMilliseconds);
 //To stop an animation store the timer into a variable and clear it
 window.clearTimeout(timer);
 window.clearInterval(timer);
+
+// execute a callback at each frame
+window.requestAnimationFrame(callbackFunction);
 ```
 
 ### Element Position & dimensions

JavaScript/JavaScript.md

@@ -28,16 +28,15 @@
  */
 ```
 
-### Naming Conventions
-
-| Elements | Case      |
-| -------- | --------- |
-| variable | camelCase |
-
 ### Modern Mode
 
 If located at the top of the script the whole script works the “modern” way (enables post-ES5 functionalities).  
-`"use strict"`
+
+```js
+"use strict"
+
+// script contents
+```
 
 ### Pop-Up message
 
@@ -328,8 +327,7 @@ if (condition) {
 
 ### Ternary Operator
 
-`condition ? instruction1 : istruction2;`  
-Ff TRUE execute instruction1, execute instruction2 otherwise.
+`condition ? <expr1> : <expr2>;`  
 
 ### Switch Statement
 
@@ -480,6 +478,7 @@ for(let key in dict) {
   // do something with "key" and "value" variables
 }
 
+Object.keys(dict).forEach(key => { });
 ```
 
 ## Functions