diff --git a/to.etc.domui/src/main/java/to/etc/domui/dom/Animations.java b/to.etc.domui/src/main/java/to/etc/domui/dom/Animations.java
index f5a71d27c..bfef5fe34 100644
--- a/to.etc.domui/src/main/java/to/etc/domui/dom/Animations.java
+++ b/to.etc.domui/src/main/java/to/etc/domui/dom/Animations.java
@@ -48,14 +48,14 @@ public NodeFixer(NodeBase node, DisplayType newDisplay) {
 	 * Since after the slideDown the node in the browser will have its default display this is also the state
 	 * in DomUI's node.
 	 *
-	 * @param node
+	 * @param node target node
 	 */
 	static public void slideDown(NodeBase node) {
 		node.getPage().addAfterRenderListener(new NodeFixer(node, node.getDisplay()));
 		node.setDisplay(DisplayType.NONE);
 		node.appendStatement()
 			.select(node)
-			.method("slideDown").end()
+			.method("doSlideDown").end()
 			.endmethod()
 			.next();
 	}
@@ -75,7 +75,7 @@ static public void slideUp(NodeBase node, String jsCallback) {
 		node.getPage().addAfterRenderListener(new NodeFixer(node, DisplayType.NONE));
 		node.appendStatement()
 			.select(node)
-			.append(".slideUp(function() { " + jsCallback + " })")
+			.append(".doSlideUp(function() { " + jsCallback + " })")
 			.next();
 	}
 
@@ -104,6 +104,7 @@ static public void bounce(NodeBase node) {
 
 	/**
 	 * Does pulsate effect.
+	 *
 	 * @param node target node
 	 * @param times if 0 it uses default behavior for pulsate.
 	 */
diff --git a/to.etc.domui/src/main/java/to/etc/domui/dom/HtmlTagRenderer.java b/to.etc.domui/src/main/java/to/etc/domui/dom/HtmlTagRenderer.java
index 78da7064d..75a3b9ff2 100644
--- a/to.etc.domui/src/main/java/to/etc/domui/dom/HtmlTagRenderer.java
+++ b/to.etc.domui/src/main/java/to/etc/domui/dom/HtmlTagRenderer.java
@@ -81,7 +81,12 @@
 import to.etc.util.StringTool;
 
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+import static to.etc.util.StringTool.isBlank;
 
 /**
  * Basic, mostly standard-compliant handler for rendering HTML tags.
@@ -90,6 +95,15 @@
  * Created on Aug 17, 2007
  */
 public class HtmlTagRenderer implements INodeVisitor {
+
+	/** Replacing specific style attributes with build-in classes -> optimization when we render styles attributes as jquery js code for CSP support */
+	private static final Map<String, String> STYLE_ATTRIBUTES_TO_CLASSES = Map.of(
+		"display:none", "ui-display-none", //
+		"display:inline", "ui-display-inline", //
+		"display:block", "ui-display-block", //
+		"display:flex", "ui-display-flex" //
+	);
+
 	/** Scratch stringbuffer. */
 	private StringBuilder m_sb;
 
@@ -615,7 +629,7 @@ static private String border(final StringBuilder a, final int w, final String s,
 	}
 
 	static private void renderBorderIf(@NonNull Appendable a, @Nullable String border) throws IOException {
-		if(StringTool.isBlank(border))
+		if(isBlank(border))
 			return;
 		a.append("border:").append(border).append(";");
 	}
@@ -678,8 +692,26 @@ public void basicNodeRender(final NodeBase b, final IBrowserOutput o, boolean in
 		}
 
 		String s = getStyleFor(b); 								// Get/recalculate style
+
+		//collect replacing classes for specified style attributes
+		List<String> classesFromStyleAttributes = new ArrayList<>();
 		if(!s.isEmpty() || b.isStyleRendered()) {
-			o.attr("style", s);
+			StringBuilder styleSb = new StringBuilder();
+			String[] styles = s.split(";");
+			for(int i = 0; i < styles.length; i++) {
+				String stylePart = styles[i];
+				if(!isBlank(stylePart)) {
+					String aClass = STYLE_ATTRIBUTES_TO_CLASSES.get(stylePart);
+					if(null != aClass) {
+						classesFromStyleAttributes.add(aClass);
+					} else {
+						styleSb.append(stylePart).append(";");
+					}
+				}
+			}
+			if(styleSb.length() > 0) {
+				o.attr("style", styleSb.toString());
+			}
 			if(s.isEmpty()) {
 				b.clearStyleRendered(); // if we rendered the empty style we can remove it next time
 			} else {
@@ -721,8 +753,20 @@ public void basicNodeRender(final NodeBase b, final IBrowserOutput o, boolean in
 
 		if(b.isStretchHeight())
 			o.attr("stretch", "true");
-		if(b.getCssClass() != null)
-			o.attr("class", b.getCssClass());
+
+		//append collected replacing classes too to existing classes of an element
+		String cssClass = b.getCssClass();
+		if(cssClass != null || !classesFromStyleAttributes.isEmpty()) {
+			if(!classesFromStyleAttributes.isEmpty()) {
+				String appendedClasses = classesFromStyleAttributes.stream().collect(Collectors.joining(" "));
+				if(null == cssClass) {
+					cssClass = appendedClasses;
+				}else {
+					cssClass = cssClass + " " + appendedClasses;
+				}
+			}
+			o.attr("class", cssClass);
+		}
 
 		List<String> sal = b.getSpecialAttributeList();
 		if(sal != null) {
@@ -1076,11 +1120,11 @@ public void visitInput(final Input n) throws Exception {
 			o().attr("onblur", sb().append(transformScript).append("WebUI.hideLookupTypingPopup('").append(n.getActualID()).append("')").toString());
 		} else {
 			//-- Attach normal onKeyPress handling.
-			if(!StringTool.isBlank(n.getOnKeyPressJS())) {
+			if(!isBlank(n.getOnKeyPressJS())) {
 				o().attr("onkeypress", "return " + n.getOnKeyPressJS());
 			}
 
-			if(!StringTool.isBlank(transformScript)) {
+			if(!isBlank(transformScript)) {
 				o().attr("onblur", sb().append(transformScript).toString());
 			}
 		}
diff --git a/to.etc.domui/src/main/resources/resources/themes/scss/winter/_core.scss b/to.etc.domui/src/main/resources/resources/themes/scss/winter/_core.scss
index d97bc6879..3e798ad42 100644
--- a/to.etc.domui/src/main/resources/resources/themes/scss/winter/_core.scss
+++ b/to.etc.domui/src/main/resources/resources/themes/scss/winter/_core.scss
@@ -209,3 +209,19 @@ i, em {
 	text-align: left;
 	white-space: nowrap;
 }
+
+.ui-display-none {
+	display: none !important;
+}
+
+.ui-display-inline {
+	display: inline !important;
+}
+
+.ui-display-block {
+	display: block !important;
+}
+
+.ui-display-flex {
+	display: flex !important;
+}
diff --git a/to.etc.domui/src/main/resources/resources/ts/domui.comp.ts b/to.etc.domui/src/main/resources/resources/ts/domui.comp.ts
index a1f4761f9..b0638026d 100644
--- a/to.etc.domui/src/main/resources/resources/ts/domui.comp.ts
+++ b/to.etc.domui/src/main/resources/resources/ts/domui.comp.ts
@@ -393,8 +393,54 @@ namespace WebUI {
 		WebUI.valuechanged('eh', id);
 	}
 
+	export function fixDisplayClass(elem): void {
+		let style = $(elem).attr("style");
+		if(null == style) {
+			return;
+		}
+		if(style.includes("display: none;")) {
+			style = style
+				.replace("display: none;", "")
+			$(elem).attr("style", style);
+			$(elem).removeClass("ui-display-block");
+			$(elem).removeClass("ui-display-flex");
+			$(elem).removeClass("ui-display-inline");
+			$(elem).addClass("ui-display-none");
+		}
+		if(style.includes("display: block;")) {
+			style = style
+				.replace("display: block;", "")
+			$(elem).attr("style", style);
+			$(elem).removeClass("ui-display-none");
+			$(elem).removeClass("ui-display-flex");
+			$(elem).removeClass("ui-display-inline");
+			$(elem).addClass("ui-display-block");
+		}
+		if(style.includes("display: inline;")) {
+			style = style
+				.replace("display: inline;", "")
+			$(elem).attr("style", style);
+			$(elem).removeClass("ui-display-none");
+			$(elem).removeClass("ui-display-block");
+			$(elem).removeClass("ui-display-flex");
+			$(elem).addClass("ui-display-inline");
+		}
+		if(style.includes("display: flex;")) {
+			style = style
+				.replace("display: flex;", "")
+			$(elem).attr("style", style);
+			$(elem).removeClass("ui-display-none");
+			$(elem).removeClass("ui-display-block");
+			$(elem).removeClass("ui-display-inline");
+			$(elem).addClass("ui-display-flex");
+		}
+	}
+
 	export function flare(id): void {
+		$('#' + id).css('display', 'none');
+		$('#' + id).removeClass("ui-display-none");
 		$('#' + id).fadeIn('fast', function() {
+			WebUI.fixDisplayClass($('#' + id));
 			$('#' + id).delay(500).fadeOut(1000, function() {
 				$('#' + id).remove();
 			});
@@ -402,7 +448,10 @@ namespace WebUI {
 	}
 
 	export function flareStay(id): void {
+		$('#' + id).css('display', 'none');
+		$('#' + id).removeClass("ui-display-none");
 		$('#' + id).fadeIn('fast', function() {
+			WebUI.fixDisplayClass($('#' + id));
 			$('body,html').bind('mousemove.' + id, function(e) {
 				$('body,html').unbind('mousemove.' + id);
 				$('#' + id).delay(500).fadeOut(1000, function() {
@@ -413,7 +462,10 @@ namespace WebUI {
 	}
 
 	export function flareStayCustom(id, delay, fadeOut): void {
+		$('#' + id).css('display', 'none');
+		$('#' + id).removeClass("ui-display-none");
 		$('#' + id).fadeIn('fast', function() {
+			WebUI.fixDisplayClass($('#' + id));
 			$('body,html').bind('mousemove.' + id, function(e) {
 				$('body,html').unbind('mousemove.' + id);
 				$('#' + id).delay(delay).fadeOut(fadeOut, function() {
diff --git a/to.etc.domui/src/main/resources/resources/ts/domui.jquery.ts b/to.etc.domui/src/main/resources/resources/ts/domui.jquery.ts
index 85e04c338..21476b485 100644
--- a/to.etc.domui/src/main/resources/resources/ts/domui.jquery.ts
+++ b/to.etc.domui/src/main/resources/resources/ts/domui.jquery.ts
@@ -153,6 +153,37 @@ $.fn.extend({
 			});
 			$(this).markerTransformed = true;
 		});
+	},
+
+	doSlideUp: function(callback) {
+		let fixDisplayCallback = function(elem) {
+			WebUI.fixDisplayClass(elem);
+		}
+
+		let myOnSlideUp = fixDisplayCallback;
+		if(null != callback) {
+			myOnSlideUp = function(elem) {
+				callback();
+				fixDisplayCallback(elem);
+			}
+		}
+		this.slideUp(myOnSlideUp(this));
+	},
+
+	doSlideDown: function(callback) {
+		let fixDisplayCallback = function(elem) {
+			WebUI.fixDisplayClass(elem);
+		}
+
+		let myOnSlideDown = fixDisplayCallback;
+		if(null != callback) {
+			myOnSlideDown = function(elem) {
+				callback();
+				fixDisplayCallback(elem);
+			}
+		}
+		this.slideDown(myOnSlideDown(this));
 	}
+
 });