static/tinymce/plugins/noneditable/editor_plugin_src.js
function insertCaretContainerOrExpandToBlock(target, before) {
			var caretContainer, rng;

			// Select block
			if (getContentEditable(target) === "false") {
				if (dom.isBlock(target)) {
					selection.select(target);
					return;
				}
			}

			rng = dom.createRng();

			if (getContentEditable(target) === "true") {
				if (!target.firstChild) {
					target.appendChild(ed.getDoc().createTextNode('\u00a0'));
				}

				target = target.firstChild;
				before = true;
			}

			//caretContainer = dom.create('span', {id: caretContainerId, 'data-mce-bogus': true, style:'border: 1px solid red'}, invisibleChar);
			caretContainer = dom.create('span', {id: caretContainerId, 'data-mce-bogus': true}, invisibleChar);

			if (before) {
				target.parentNode.insertBefore(caretContainer, target);
			} else {
				dom.insertAfter(caretContainer, target);
			}

			rng.setStart(caretContainer.firstChild, 1);
			rng.collapse(true);
			selection.setRng(rng);

			return caretContainer;
		}
function insertCaretContainerOrExpandToBlock(target, before) {
			var caretContainer, rng;

			// Select block
			if (getContentEditable(target) === "false") {
				if (dom.isBlock(target)) {
					selection.select(target);
					return;
				}
			}

			rng = dom.createRng();

			if (getContentEditable(target) === "true") {
				if (!target.firstChild) {
					target.appendChild(ed.getDoc().createTextNode('\u00a0'));
				}

				target = target.firstChild;
				before = true;
			}

			//caretContainer = dom.create('span', {id: caretContainerId, 'data-mce-bogus': true, style:'border: 1px solid red'}, invisibleChar);
			caretContainer = dom.create('span', {id: caretContainerId, 'data-mce-bogus': true}, invisibleChar);

			if (before) {
				target.parentNode.insertBefore(caretContainer, target);
			} else {
				dom.insertAfter(caretContainer, target);
			}

			rng.setStart(caretContainer.firstChild, 1);
			rng.collapse(true);
			selection.setRng(rng);

			return caretContainer;
		}
Insert caret container before/after target or expand selection to include block