diff --git a/assets/js/customize-preview.js b/assets/js/customize-preview.js
new file mode 100644
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+++ b/assets/js/customize-preview.js
@@ -0,0 +1,135 @@
+/**
+ * File customize-preview.js.
+ *
+ * Theme Customizer enhancements for a better user experience.
+ *
+ * Contains handlers to make Theme Customizer preview reload changes asynchronously.
+ */
+
+jQuery(document).ready(function ($) {
+
+	/**
+	 * Following MutationObserver are to display the default icon for each column when no Icon/Image is provided.
+	 * This will take effect when the Remove button is clicked while in the Customizer preview.
+	 */
+
+	// MutationObserver for article icon.
+	var targetNode = $(".fsmsp-article-link");
+	var observer = new MutationObserver(callback);
+	var obsConfig = { childList: true };
+	targetNode.each(function () {
+		observer.observe(this, obsConfig);
+	});
+	function callback(mutationList) {
+		mutationList.forEach(function (mutation) {
+			if (mutation.type == 'childList') {
+				/**
+				 * When <span class="customize-partial-edit-shortcut customize-partial-edit-shortcut-fsmsp_article_icon">
+				 * is the only child left (this is when we click on the remove button after adding a chosen image/icon),
+				 * we append the default article icon (fsmsp_cp.fsmsp_article_icon) to the targetNode.
+				 */
+				if (mutation.target.childNodes.length == 1) {
+					targetNode.append(fsmsp_cp.fsmsp_article_icon);
+				}
+			}
+		});
+	}
+	// MutationObserver for category icon.
+	var targetNodeCat = $(".fsmsp-category-image");
+	var observerCat = new MutationObserver(callbackCategory);
+	var obsConfigCat = { childList: true };
+	targetNodeCat.each(function () {
+		observerCat.observe(this, obsConfigCat);
+	});
+	function callbackCategory(mutationList) {
+		mutationList.forEach(function (mutation) {
+			if (mutation.type == 'childList') {
+				var $length = targetNodeCat.children().length;
+				if ($length == 5) {
+					targetNodeCat.append(fsmsp_cp.fsmsp_category_icon);
+				}
+			}
+		});
+	}
+	// MutationObserver for tag icon.
+	var targetNodeTag = $(".fsmsp-tag-image");
+	var observerTag = new MutationObserver(callbackTag);
+	var obsConfigTag = { childList: true };
+	targetNodeTag.each(function () {
+		observerTag.observe(this, obsConfigTag);
+	});
+	function callbackTag(mutationList) {
+		mutationList.forEach(function (mutation) {
+			if (mutation.type == 'childList') {
+				var $length = targetNodeTag.children().length;
+				if ($length == 5) {
+					targetNodeTag.append(fsmsp_cp.fsmsp_tag_icon);
+				}
+			}
+		});
+	}
+
+	/**
+	 * Following MutationObserver are to display the default placeholder text (search...),
+	 * if the user choose to display another placeholder text, then remove completely his chosen text.
+	 * This will happen when the user erase all charachters of his text in the FSMS Search Form Text option.
+	 */
+
+	// MutationObserver for placeholder text.
+	var targetNodePhT = $("input.morphsearch-input");
+	var observerPhT = new MutationObserver(callbackPhT);
+	var obsConfigPht = { attributes: true };
+	targetNodePhT.each(function () {
+		observerPhT.observe(this, obsConfigPht);
+	});
+	function callbackPhT(mutations) {
+		mutations.forEach(function (mutation) {
+			if (mutation.type == 'attributes') {
+				var entry = {
+					mutation: mutation,
+					el: mutation.target,
+					value: mutation.target.placeholder.length,
+				};
+			}
+			if (entry.value == 0) {
+				$('.morphsearch-form .morphsearch-input').attr('placeholder', fsmsp_cp.fsmsp_placeholder_text);
+			}
+		});
+	}
+
+	/**
+	 * Following MutationObserver are to prevent weird behaviour in Chrome and Edge,
+	 * when we focus on the input of the text control option to change the placeholder text.
+	 * It's not needed but was added to reflect the same behaviour as on the live site (not Customizer preview),
+	 * in order to focus() on the .morphsearch-input when the overlay comes out, then close it if we press on the Esc button.
+	 */
+
+	// MutationObserver for input focus.
+	var targetObj = $("#morphsearch");
+	var observerObject = new MutationObserver(mutationObjectCallback);
+	var obsConfig = { attributes: true };
+	targetObj.each(function () {
+		observerObject.observe(this, obsConfig);
+	});
+	function mutationObjectCallback(mutationRecordsList) {
+		mutationRecordsList.forEach(function(mutationRecord) {
+		if ("attributes" === mutationRecord.type) {
+			// This focus() will affect every input in a form[role=search] !
+			$('.morphsearch-input').focus();
+			$('.morphsearch').on('keydown', function (event) {
+				if (event.keyCode === 27) {
+					// Remove the focus() first with blur() on every form[role=search] input !
+					$('form[role=search] input').blur();
+					/**
+					 * Now, we can call the desired method to close the overlay.
+					 * We could have done the following :
+					 * $('.morphsearch-close').click();
+					 */
+					$('.morphsearch').removeClass('open');
+				}
+			});
+		}
+		});
+	}
+
+});
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