static/tinymce/plugins/noneditable/editor_plugin_src.js
function getContentEditable(node) {
			var contentEditable;

			// Ignore non elements
			if (node.nodeType === 1) {
				// Check for fake content editable
				contentEditable = node.getAttribute(internalName);
				if (contentEditable && contentEditable !== "inherit") {
					return contentEditable;
				}

				// Check for real content editable
				contentEditable = node.contentEditable;
				if (contentEditable !== "inherit") {
					return contentEditable;
				}
			}

			return null;
		}
function getContentEditable(node) {
			var contentEditable;

			// Ignore non elements
			if (node.nodeType === 1) {
				// Check for fake content editable
				contentEditable = node.getAttribute(internalName);
				if (contentEditable && contentEditable !== "inherit") {
					return contentEditable;
				}

				// Check for real content editable
				contentEditable = node.contentEditable;
				if (contentEditable !== "inherit") {
					return contentEditable;
				}
			}

			return null;
		}
Returns the content editable state of a node "true/false" or null