diff --git a/examples/astro-xyflow/src/components/ReactFlowExample/index.tsx b/examples/astro-xyflow/src/components/ReactFlowExample/index.tsx
index 4f8ef0ab..863458fb 100644
--- a/examples/astro-xyflow/src/components/ReactFlowExample/index.tsx
+++ b/examples/astro-xyflow/src/components/ReactFlowExample/index.tsx
@@ -81,6 +81,8 @@ const initialNodes: Node[] = [
     id: '4',
     data: { label: 'Node 4' },
     position: { x: 400, y: 200 },
+    width: 200,
+    height: 50,
     type: 'custom',
   },
 ];
diff --git a/examples/astro-xyflow/src/components/ReactFlowInitialExample/CustomNode.tsx b/examples/astro-xyflow/src/components/ReactFlowInitialExample/CustomNode.tsx
new file mode 100644
index 00000000..c7fae3d8
--- /dev/null
+++ b/examples/astro-xyflow/src/components/ReactFlowInitialExample/CustomNode.tsx
@@ -0,0 +1,21 @@
+import { memo, useState } from 'react';
+import { Handle, Position } from '@xyflow/react';
+
+function CustomNode() {
+  const [text, setText] = useState('this is a pretty long text');
+
+  return (
+    <>
+      <Handle type="target" position={Position.Top} />
+      <div style={{ background: '#eee', padding: 10 }}>
+        <div>
+          <input value={text} onChange={(e) => setText(e.target.value)} />
+          <div>text: {text}</div>
+        </div>
+      </div>
+      <Handle type="source" position={Position.Bottom} />
+    </>
+  );
+}
+
+export default memo(CustomNode);
diff --git a/examples/astro-xyflow/src/components/ReactFlowInitialExample/index.tsx b/examples/astro-xyflow/src/components/ReactFlowInitialExample/index.tsx
new file mode 100644
index 00000000..b3f99a6b
--- /dev/null
+++ b/examples/astro-xyflow/src/components/ReactFlowInitialExample/index.tsx
@@ -0,0 +1,69 @@
+import { useCallback } from 'react';
+import {
+  ReactFlow,
+  addEdge,
+  useEdgesState,
+  useNodesState,
+  Background,
+  Controls,
+  type Connection,
+  type Edge,
+  type Node,
+} from '@xyflow/react';
+
+import CustomNode from './CustomNode';
+
+import '@xyflow/react/dist/style.css';
+
+const initialNodes: Node[] = [
+  {
+    id: '1',
+    data: {},
+    position: { x: 0, y: 0 },
+    initialWidth: 200,
+    initialHeight: 50,
+    type: 'custom',
+  },
+  {
+    id: '2',
+    data: {},
+    position: { x: 0, y: 200 },
+    width: 200,
+    initialHeight: 50,
+    type: 'custom',
+  },
+];
+
+const initialEdges: Edge[] = [{ id: 'e1-2', source: '1', target: '2' }];
+
+const nodeTypes = {
+  custom: CustomNode,
+};
+
+function Flow() {
+  const [nodes, , onNodesChange] = useNodesState(initialNodes);
+  const [edges, setEdges, onEdgesChange] = useEdgesState(initialEdges);
+  const onConnect = useCallback((params: Connection | Edge) => setEdges((eds) => addEdge(params, eds)), [setEdges]);
+
+  return (
+    <div style={{ width: 700, height: 400 }}>
+      <ReactFlow
+        nodes={nodes}
+        onNodesChange={onNodesChange}
+        edges={edges}
+        onEdgesChange={onEdgesChange}
+        onConnect={onConnect}
+        nodeTypes={nodeTypes}
+        fitView
+        width={700}
+        height={400}
+        debug
+      >
+        <Background />
+        <Controls />
+      </ReactFlow>
+    </div>
+  );
+}
+
+export default Flow;
diff --git a/examples/astro-xyflow/src/components/SvelteFlowInitialExample/CustomNode.svelte b/examples/astro-xyflow/src/components/SvelteFlowInitialExample/CustomNode.svelte
new file mode 100644
index 00000000..5bef87c9
--- /dev/null
+++ b/examples/astro-xyflow/src/components/SvelteFlowInitialExample/CustomNode.svelte
@@ -0,0 +1,25 @@
+<script lang="ts">
+  import { Handle, Position, type NodeProps } from '@xyflow/svelte';
+
+  type $$Props = NodeProps;
+
+  let text = 'some default text';
+</script>
+
+<Handle type="target" position={Position.Left} />
+<div class="custom">
+  <div>
+    text: {text}
+  </div>
+  <input type="text" bind:value={text} />
+</div>
+<Handle type="source" position={Position.Right} />
+
+<style>
+  .custom {
+    background-color: white;
+    padding: 10px;
+    border: 1px solid #777;
+    border-radius: 20px;
+  }
+</style>
diff --git a/examples/astro-xyflow/src/components/SvelteFlowInitialExample/index.svelte b/examples/astro-xyflow/src/components/SvelteFlowInitialExample/index.svelte
new file mode 100644
index 00000000..8fbe4905
--- /dev/null
+++ b/examples/astro-xyflow/src/components/SvelteFlowInitialExample/index.svelte
@@ -0,0 +1,39 @@
+<script lang="ts">
+  import { writable } from 'svelte/store';
+  import { SvelteFlow, Controls, Background, BackgroundVariant, type Node, type Edge } from '@xyflow/svelte';
+
+  import '@xyflow/svelte/dist/style.css';
+  import CustomNode from './CustomNode.svelte';
+
+  const nodes = writable<Node[]>([
+    {
+      id: '1',
+      position: { x: 0, y: 0 },
+      data: {},
+      initialWidth: 100,
+      initialHeight: 40,
+      type: 'input-node',
+    },
+    {
+      id: '2',
+      position: { x: 0, y: 150 },
+      data: {},
+      initialWidth: 100,
+      initialHeight: 40,
+      type: 'input-node',
+    },
+  ]);
+
+  const edges = writable<Edge[]>([{ id: '1-2', source: '1', target: '2' }]);
+
+  const nodeTypes = {
+    'input-node': CustomNode,
+  };
+</script>
+
+<div style="height: 400px; width: 700px;">
+  <SvelteFlow {nodes} {edges} {nodeTypes} fitView width={700} height={400}>
+    <Controls />
+    <Background variant={BackgroundVariant.Dots} />
+  </SvelteFlow>
+</div>
diff --git a/examples/astro-xyflow/src/pages/index.astro b/examples/astro-xyflow/src/pages/index.astro
index be9d1885..d7b14558 100644
--- a/examples/astro-xyflow/src/pages/index.astro
+++ b/examples/astro-xyflow/src/pages/index.astro
@@ -1,6 +1,8 @@
 ---
-import ReactFlowApp from '../components/ReactFlowExample' 
-import SvelteFlowApp from '../components/SvelteFlowExample/index.svelte' 
+import ReactFlowApp from '../components/ReactFlowExample';
+import ReactFlowInitialApp from '../components/ReactFlowInitialExample';
+import SvelteFlowApp from '../components/SvelteFlowExample/index.svelte';
+import SvelteFlowInitialApp from '../components/SvelteFlowInitialExample/index.svelte';
 ---
 
 <html lang="en">
@@ -18,10 +20,24 @@ import SvelteFlowApp from '../components/SvelteFlowExample/index.svelte'
 		</style>
 	</head>
 	<body>
+		<h2>React Flow</h2>
+		<p>no client hydration</p>
+		<ReactFlowApp />
+
+		<p>client hydration on load (client:load)</p>
+		<ReactFlowApp client:load />
+
+		<p>client hydration on load (client:load) and initialWidth / initialHeight</p>
+		<ReactFlowInitialApp client:load />
+
 		<h2>Svelte Flow</h2>
 		<SvelteFlowApp />
 
-		<h2>React Flow</h2>
-		<ReactFlowApp />
+		<p>client hydration on load (client:load)</p>
+		<SvelteFlowApp client:load />
+
+		<p>client hydration on load (client:load) and initialWidth / initialHeight</p>
+		<SvelteFlowInitialApp client:load />
+
 	</body>
 </html>
diff --git a/packages/react/CHANGELOG.md b/packages/react/CHANGELOG.md
index d9529c27..69b51bf7 100644
--- a/packages/react/CHANGELOG.md
+++ b/packages/react/CHANGELOG.md
@@ -4,13 +4,14 @@
 
 ## ⚠️ Breaking changes
 
-- `useNodesData` not only returns data objects but also the type and the id of the node. 
+- `useNodesData` not only returns data objects but also the type and the id of the node
 
 ## Patch changes
 
 - better cursor defaults for the pane, nodes and edges
 - `disableKeyboardA11y` now also disables Enter and Escape for selecting/deselecting nodes and edges
 - fix bug where users couldn't drag a node after toggle nodes `hidden` attribute
+- add `initialWidth` and `initialHeight` node attributes for specifying initial dimensions for ssr
 
 ## 12.0.0-next.9
 
diff --git a/packages/react/src/additional-components/MiniMap/MiniMapNodes.tsx b/packages/react/src/additional-components/MiniMap/MiniMapNodes.tsx
index 0dfb8fff..0abe3177 100644
--- a/packages/react/src/additional-components/MiniMap/MiniMapNodes.tsx
+++ b/packages/react/src/additional-components/MiniMap/MiniMapNodes.tsx
@@ -1,7 +1,7 @@
 /* eslint-disable @typescript-eslint/ban-ts-comment */
 /* eslint-disable @typescript-eslint/no-explicit-any */
 import { ComponentType, memo } from 'react';
-import { NodeOrigin, getNodePositionWithOrigin } from '@xyflow/system';
+import { NodeOrigin, getNodeDimensions, getNodePositionWithOrigin, nodeHasDimensions } from '@xyflow/system';
 import { shallow } from 'zustand/shallow';
 
 import { useStore } from '../../hooks/useStore';
@@ -94,16 +94,19 @@ function NodeComponentWrapperInner<NodeType extends Node>({
       y,
     };
   }, shallow);
-  if (!node || node.hidden || !(node.computed?.width || node.width) || !(node.computed?.height || node.height)) {
+
+  if (!node || node.hidden || !nodeHasDimensions(node)) {
     return null;
   }
 
+  const { width, height } = getNodeDimensions(node);
+
   return (
     <NodeComponent
       x={x}
       y={y}
-      width={node.computed?.width ?? node.width ?? 0}
-      height={node.computed?.height ?? node.height ?? 0}
+      width={width}
+      height={height}
       style={node.style}
       selected={!!node.selected}
       className={nodeClassNameFunc(node)}
diff --git a/packages/react/src/components/NodeWrapper/index.tsx b/packages/react/src/components/NodeWrapper/index.tsx
index 87d80490..8c207cd9 100644
--- a/packages/react/src/components/NodeWrapper/index.tsx
+++ b/packages/react/src/components/NodeWrapper/index.tsx
@@ -5,9 +5,11 @@ import {
   clampPosition,
   elementSelectionKeys,
   errorMessages,
+  getNodeDimensions,
   getPositionWithOrigin,
   internalsSymbol,
   isInputDOMNode,
+  nodeHasDimensions,
 } from '@xyflow/system';
 
 import { useStore, useStoreApi } from '../../hooks/useStore';
@@ -16,7 +18,7 @@ import { ARIA_NODE_DESC_KEY } from '../A11yDescriptions';
 import { useDrag } from '../../hooks/useDrag';
 import { useMoveSelectedNodes } from '../../hooks/useMoveSelectedNodes';
 import { handleNodeClick } from '../Nodes/utils';
-import { arrowKeyDiffs, builtinNodeTypes } from './utils';
+import { arrowKeyDiffs, builtinNodeTypes, getNodeInlineStyleDimensions } from './utils';
 import type { Node, NodeWrapperProps } from '../../types';
 
 export function NodeWrapper<NodeType extends Node>({
@@ -79,11 +81,9 @@ export function NodeWrapper<NodeType extends Node>({
   const prevTargetPosition = useRef(node.targetPosition);
   const prevType = useRef(nodeType);
 
-  const width = node.width ?? undefined;
-  const height = node.height ?? undefined;
-  const computedWidth = node.computed?.width;
-  const computedHeight = node.computed?.height;
-  const initialized = (!!computedWidth && !!computedHeight) || (!!width && !!height);
+  const nodeDimensions = getNodeDimensions(node);
+  const inlineDimensions = getNodeInlineStyleDimensions(node);
+  const initialized = nodeHasDimensions(node);
   const hasHandleBounds = !!node[internalsSymbol]?.handleBounds;
 
   const moveSelectedNodes = useMoveSelectedNodes();
@@ -143,8 +143,7 @@ export function NodeWrapper<NodeType extends Node>({
   const positionAbsoluteOrigin = getPositionWithOrigin({
     x: positionAbsoluteX,
     y: positionAbsoluteY,
-    width: computedWidth ?? width ?? 0,
-    height: computedHeight ?? height ?? 0,
+    ...nodeDimensions,
     origin: node.origin || nodeOrigin,
   });
   const hasPointerEvents = isSelectable || isDraggable || onClick || onMouseEnter || onMouseMove || onMouseLeave;
@@ -226,8 +225,7 @@ export function NodeWrapper<NodeType extends Node>({
         pointerEvents: hasPointerEvents ? 'all' : 'none',
         visibility: initialized ? 'visible' : 'hidden',
         ...node.style,
-        width: width ?? node.style?.width,
-        height: height ?? node.style?.height,
+        ...inlineDimensions,
       }}
       data-id={id}
       data-testid={`rf__node-${id}`}
@@ -248,8 +246,6 @@ export function NodeWrapper<NodeType extends Node>({
           id={id}
           data={node.data}
           type={nodeType}
-          width={computedWidth}
-          height={computedHeight}
           positionAbsoluteX={positionAbsoluteX}
           positionAbsoluteY={positionAbsoluteY}
           selected={node.selected}
@@ -259,6 +255,7 @@ export function NodeWrapper<NodeType extends Node>({
           dragging={dragging}
           dragHandle={node.dragHandle}
           zIndex={zIndex}
+          {...nodeDimensions}
         />
       </Provider>
     </div>
diff --git a/packages/react/src/components/NodeWrapper/utils.tsx b/packages/react/src/components/NodeWrapper/utils.tsx
index 5dd73964..f98b6bb6 100644
--- a/packages/react/src/components/NodeWrapper/utils.tsx
+++ b/packages/react/src/components/NodeWrapper/utils.tsx
@@ -5,7 +5,7 @@ import { InputNode } from '../Nodes/InputNode';
 import { DefaultNode } from '../Nodes/DefaultNode';
 import { GroupNode } from '../Nodes/GroupNode';
 import { OutputNode } from '../Nodes/OutputNode';
-import type { NodeTypes } from '../../types';
+import type { Node, NodeTypes } from '../../types';
 
 export const arrowKeyDiffs: Record<string, XYPosition> = {
   ArrowUp: { x: 0, y: -1 },
@@ -20,3 +20,22 @@ export const builtinNodeTypes: NodeTypes = {
   output: OutputNode as ComponentType<NodeProps>,
   group: GroupNode as ComponentType<NodeProps>,
 };
+
+export function getNodeInlineStyleDimensions<NodeType extends Node = Node>(
+  node: NodeType
+): {
+  width: number | string | undefined;
+  height: number | string | undefined;
+} {
+  if (!node.computed) {
+    return {
+      width: node.width ?? node.initialWidth ?? node.style?.width,
+      height: node.height ?? node.initialHeight ?? node.style?.height,
+    };
+  }
+
+  return {
+    width: node.width ?? node.style?.width,
+    height: node.height ?? node.style?.height,
+  };
+}
diff --git a/packages/react/src/components/StoreUpdater/index.tsx b/packages/react/src/components/StoreUpdater/index.tsx
index 7917e3d6..6d92e8b4 100644
--- a/packages/react/src/components/StoreUpdater/index.tsx
+++ b/packages/react/src/components/StoreUpdater/index.tsx
@@ -65,6 +65,7 @@ const reactFlowFieldsToTrack = [
   'selectNodesOnDrag',
   'nodeDragThreshold',
   'onBeforeDelete',
+  'debug',
 ] as const;
 
 type ReactFlowFieldsToTrack = (typeof reactFlowFieldsToTrack)[number];
diff --git a/packages/react/src/container/ReactFlow/index.tsx b/packages/react/src/container/ReactFlow/index.tsx
index c80552f8..88d8843e 100644
--- a/packages/react/src/container/ReactFlow/index.tsx
+++ b/packages/react/src/container/ReactFlow/index.tsx
@@ -139,6 +139,7 @@ function ReactFlow<NodeType extends Node = Node, EdgeType extends Edge = Edge>(
     width,
     height,
     colorMode = 'light',
+    debug,
     ...rest
   }: ReactFlowProps<NodeType, EdgeType>,
   ref: ForwardedRef<ReactFlowRefType>
@@ -274,6 +275,7 @@ function ReactFlow<NodeType extends Node = Node, EdgeType extends Edge = Edge>(
           selectNodesOnDrag={selectNodesOnDrag}
           nodeDragThreshold={nodeDragThreshold}
           onBeforeDelete={onBeforeDelete}
+          debug={debug}
         />
         <SelectionListener onSelectionChange={onSelectionChange} />
         {children}
diff --git a/packages/react/src/store/index.ts b/packages/react/src/store/index.ts
index cae14173..a2b98c1a 100644
--- a/packages/react/src/store/index.ts
+++ b/packages/react/src/store/index.ts
@@ -89,6 +89,7 @@ const createRFStore = ({
           fitViewOnInitOptions,
           domNode,
           nodeOrigin,
+          debug,
         } = get();
         const changes: NodeDimensionChange[] = [];
 
@@ -130,6 +131,9 @@ const createRFStore = ({
         set({ nodes: nextNodes, fitViewDone: nextFitViewDone });
 
         if (changes?.length > 0) {
+          if (debug) {
+            console.log('React Flow: trigger node changes', changes);
+          }
           onNodesChange?.(changes);
         }
       },
@@ -149,7 +153,7 @@ const createRFStore = ({
         get().triggerNodeChanges(changes);
       },
       triggerNodeChanges: (changes) => {
-        const { onNodesChange, setNodes, nodes, hasDefaultNodes } = get();
+        const { onNodesChange, setNodes, nodes, hasDefaultNodes, debug } = get();
 
         if (changes?.length) {
           if (hasDefaultNodes) {
@@ -157,11 +161,15 @@ const createRFStore = ({
             setNodes(updatedNodes);
           }
 
+          if (debug) {
+            console.log('React Flow: trigger node changes', changes);
+          }
+
           onNodesChange?.(changes);
         }
       },
       triggerEdgeChanges: (changes) => {
-        const { onEdgesChange, setEdges, edges, hasDefaultEdges } = get();
+        const { onEdgesChange, setEdges, edges, hasDefaultEdges, debug } = get();
 
         if (changes?.length) {
           if (hasDefaultEdges) {
@@ -169,6 +177,10 @@ const createRFStore = ({
             setEdges(updatedEdges);
           }
 
+          if (debug) {
+            console.log('React Flow: trigger edge changes', changes);
+          }
+
           onEdgesChange?.(changes);
         }
       },
diff --git a/packages/react/src/store/initialState.ts b/packages/react/src/store/initialState.ts
index 5a1f9562..0cf3c7f0 100644
--- a/packages/react/src/store/initialState.ts
+++ b/packages/react/src/store/initialState.ts
@@ -43,7 +43,9 @@ const getInitialState = ({
   let transform: Transform = [0, 0, 1];
 
   if (fitView && width && height) {
-    const nodesWithDimensions = nextNodes.filter((node) => node.width && node.height);
+    const nodesWithDimensions = nextNodes.filter(
+      (node) => (node.width || node.initialWidth) && (node.height || node.initialHeight)
+    );
     // @todo users nodeOrigin should be used here
     const bounds = getNodesBounds(nodesWithDimensions, { nodeOrigin: [0, 0] });
     const { x, y, zoom } = getViewportForBounds(bounds, width, height, 0.5, 2, 0.1);
@@ -113,6 +115,7 @@ const getInitialState = ({
     onSelectionChangeHandlers: [],
 
     lib: 'react',
+    debug: false,
   };
 };
 
diff --git a/packages/react/src/types/component-props.ts b/packages/react/src/types/component-props.ts
index 650d0b0c..e8d91ba4 100644
--- a/packages/react/src/types/component-props.ts
+++ b/packages/react/src/types/component-props.ts
@@ -503,6 +503,11 @@ export interface ReactFlowProps<NodeType extends Node = Node, EdgeType extends E
    * @example 'system' | 'light' | 'dark'
    */
   colorMode?: ColorMode;
+  /** If set true, some debug information will be logged to the console like which events are fired.
+   *
+   * @default undefined
+   */
+  debug?: boolean;
 }
 
 export type ReactFlowRefType = HTMLDivElement;
diff --git a/packages/react/src/types/store.ts b/packages/react/src/types/store.ts
index d3472307..6c1cf9b0 100644
--- a/packages/react/src/types/store.ts
+++ b/packages/react/src/types/store.ts
@@ -146,6 +146,7 @@ export type ReactFlowStore<NodeType extends Node = Node, EdgeType extends Edge =
   isValidConnection?: IsValidConnection<EdgeType>;
 
   lib: string;
+  debug: boolean;
 };
 
 export type ReactFlowActions<NodeType extends Node, EdgeType extends Edge> = {
diff --git a/packages/svelte/CHANGELOG.md b/packages/svelte/CHANGELOG.md
index 0e8a5abf..948e69eb 100644
--- a/packages/svelte/CHANGELOG.md
+++ b/packages/svelte/CHANGELOG.md
@@ -4,11 +4,12 @@
 
 ## ⚠️ Breaking changes
 
-- `useNodesData` not only returns data objects but also the type and the id of the node. 
+- `useNodesData` not only returns data objects but also the type and the id of the node
 
 ## Patch changes
 
-- better cursor defaults for the pane, nodes and edges.
+- better cursor defaults for the pane, nodes and edges
+- add `initialWidth` and `initialHeight` node attributes for specifying initial dimensions for ssr
 
 ## 0.0.36
 
diff --git a/packages/svelte/src/lib/components/NodeWrapper/NodeWrapper.svelte b/packages/svelte/src/lib/components/NodeWrapper/NodeWrapper.svelte
index ae894066..91027f53 100644
--- a/packages/svelte/src/lib/components/NodeWrapper/NodeWrapper.svelte
+++ b/packages/svelte/src/lib/components/NodeWrapper/NodeWrapper.svelte
@@ -11,6 +11,7 @@
   import DefaultNode from '$lib/components/nodes/DefaultNode.svelte';
   import type { NodeWrapperProps } from './types';
   import type { Node } from '$lib/types';
+  import { getNodeInlineStyleDimensions } from './utils';
 
   interface $$Props extends NodeWrapperProps {}
 
@@ -34,6 +35,10 @@
   export let sourcePosition: NodeWrapperProps['sourcePosition'] = undefined;
   export let targetPosition: NodeWrapperProps['targetPosition'] = undefined;
   export let zIndex: NodeWrapperProps['zIndex'];
+  export let computedWidth: NodeWrapperProps['computedWidth'] = undefined;
+  export let computedHeight: NodeWrapperProps['computedHeight'] = undefined;
+  export let initialWidth: NodeWrapperProps['initialWidth'] = undefined;
+  export let initialHeight: NodeWrapperProps['initialHeight'] = undefined;
   export let width: NodeWrapperProps['width'] = undefined;
   export let height: NodeWrapperProps['height'] = undefined;
   export let dragHandle: NodeWrapperProps['dragHandle'] = undefined;
@@ -77,6 +82,15 @@
   let prevSourcePosition: Position | undefined = undefined;
   let prevTargetPosition: Position | undefined = undefined;
 
+  $: inlineStyleDimensions = getNodeInlineStyleDimensions({
+    width,
+    height,
+    initialWidth,
+    initialHeight,
+    computedWidth,
+    computedHeight
+  });
+
   $: {
     connectableStore.set(!!connectable);
   }
@@ -170,9 +184,7 @@
     style:z-index={zIndex}
     style:transform="translate({positionOriginX}px, {positionOriginY}px)"
     style:visibility={initialized ? 'visible' : 'hidden'}
-    style="{style ?? ''}; {!width ? '' : `width:${width}px;`} {!height
-      ? ''
-      : `height:${height}px;`}"
+    style="{inlineStyleDimensions.width} {inlineStyleDimensions.height} {style ?? ''};"
     on:click={onSelectNodeHandler}
     on:mouseenter={(event) => dispatch('nodemouseenter', { node, event })}
     on:mouseleave={(event) => dispatch('nodemouseleave', { node, event })}
diff --git a/packages/svelte/src/lib/components/NodeWrapper/types.ts b/packages/svelte/src/lib/components/NodeWrapper/types.ts
index 39fb0c10..a290ec08 100644
--- a/packages/svelte/src/lib/components/NodeWrapper/types.ts
+++ b/packages/svelte/src/lib/components/NodeWrapper/types.ts
@@ -16,9 +16,13 @@ export type NodeWrapperProps = Pick<
   | 'targetPosition'
   | 'dragHandle'
   | 'hidden'
+  | 'width'
+  | 'height'
+  | 'initialWidth'
+  | 'initialHeight'
 > & {
-  width?: number;
-  height?: number;
+  computedWidth?: number;
+  computedHeight?: number;
   type: string;
   positionX: number;
   positionY: number;
diff --git a/packages/svelte/src/lib/components/NodeWrapper/utils.ts b/packages/svelte/src/lib/components/NodeWrapper/utils.ts
new file mode 100644
index 00000000..b2609587
--- /dev/null
+++ b/packages/svelte/src/lib/components/NodeWrapper/utils.ts
@@ -0,0 +1,33 @@
+export function getNodeInlineStyleDimensions({
+  width,
+  height,
+  initialWidth,
+  initialHeight,
+  computedWidth,
+  computedHeight
+}: {
+  width?: number;
+  height?: number;
+  initialWidth?: number;
+  initialHeight?: number;
+  computedWidth?: number;
+  computedHeight?: number;
+}): {
+  width: string | undefined;
+  height: string | undefined;
+} {
+  if (computedWidth === undefined && computedHeight === undefined) {
+    const styleWidth = width ?? initialWidth;
+    const styleHeight = height ?? initialHeight;
+
+    return {
+      width: styleWidth ? `width:${styleWidth}px;` : '',
+      height: styleHeight ? `height:${styleHeight}px;` : ''
+    };
+  }
+
+  return {
+    width: width ? `width:${width}px;` : '',
+    height: height ? `height:${height}px;` : ''
+  };
+}
diff --git a/packages/svelte/src/lib/container/NodeRenderer/NodeRenderer.svelte b/packages/svelte/src/lib/container/NodeRenderer/NodeRenderer.svelte
index df399a7d..8761942d 100644
--- a/packages/svelte/src/lib/container/NodeRenderer/NodeRenderer.svelte
+++ b/packages/svelte/src/lib/container/NodeRenderer/NodeRenderer.svelte
@@ -1,6 +1,11 @@
 <script lang="ts">
   import { onDestroy } from 'svelte';
-  import { internalsSymbol, getPositionWithOrigin } from '@xyflow/system';
+  import {
+    internalsSymbol,
+    getPositionWithOrigin,
+    getNodeDimensions,
+    nodeHasDimensions
+  } from '@xyflow/system';
 
   import { NodeWrapper } from '$lib/components/NodeWrapper';
   import { useStore } from '$lib/store';
@@ -39,11 +44,11 @@
 
 <div class="svelte-flow__nodes">
   {#each $visibleNodes as node (node.id)}
+    {@const nodeDimesions = getNodeDimensions(node)}
     {@const posOrigin = getPositionWithOrigin({
       x: node.computed?.positionAbsolute?.x ?? 0,
       y: node.computed?.positionAbsolute?.y ?? 0,
-      width: node.computed?.width ?? node.width ?? 0,
-      height: node.computed?.height ?? node.height ?? 0,
+      ...nodeDimesions,
       origin: node.origin
     })}
     <NodeWrapper
@@ -74,10 +79,13 @@
       dragging={node.dragging}
       zIndex={node[internalsSymbol]?.z ?? 0}
       dragHandle={node.dragHandle}
-      width={node.width ?? undefined}
-      height={node.height ?? undefined}
-      initialized={(!!node.computed?.width && !!node.computed?.height) ||
-        (!!node.width && !!node.height)}
+      initialized={nodeHasDimensions(node)}
+      width={node.width}
+      height={node.height}
+      initialWidth={node.initialWidth}
+      initialHeight={node.initialHeight}
+      computedWidth={node.computed?.width}
+      computedHeight={node.computed?.height}
       {resizeObserver}
       on:nodeclick
       on:nodemouseenter
diff --git a/packages/svelte/src/lib/plugins/Minimap/Minimap.svelte b/packages/svelte/src/lib/plugins/Minimap/Minimap.svelte
index 031235b6..a722ed9c 100644
--- a/packages/svelte/src/lib/plugins/Minimap/Minimap.svelte
+++ b/packages/svelte/src/lib/plugins/Minimap/Minimap.svelte
@@ -7,7 +7,13 @@
 
 <script lang="ts">
   import cc from 'classcat';
-  import { getBoundsOfRects, getNodePositionWithOrigin, getNodesBounds } from '@xyflow/system';
+  import {
+    getBoundsOfRects,
+    getNodeDimensions,
+    getNodePositionWithOrigin,
+    getNodesBounds,
+    nodeHasDimensions
+  } from '@xyflow/system';
 
   import { useStore } from '$lib/store';
   import { Panel } from '$lib/container/Panel';
@@ -116,13 +122,13 @@
       {#if ariaLabel}<title id={labelledBy}>{ariaLabel}</title>{/if}
 
       {#each $nodes as node (node.id)}
-        {#if (node.computed?.width || node?.width) && (node.computed?.height || node.height)}
+        {#if nodeHasDimensions(node)}
           {@const pos = getNodePositionWithOrigin(node).positionAbsolute}
+          {@const nodeDimesions = getNodeDimensions(node)}
           <MinimapNode
             x={pos.x}
             y={pos.y}
-            width={node.computed?.width ?? node.width ?? 0}
-            height={node.computed?.height ?? node.height ?? 0}
+            {...nodeDimesions}
             selected={node.selected}
             color={nodeColorFunc?.(node)}
             borderRadius={nodeBorderRadius}
diff --git a/packages/svelte/src/lib/store/index.ts b/packages/svelte/src/lib/store/index.ts
index e6243fb9..4d7a0a9f 100644
--- a/packages/svelte/src/lib/store/index.ts
+++ b/packages/svelte/src/lib/store/index.ts
@@ -1,7 +1,6 @@
 import { getContext, setContext } from 'svelte';
 import { derived, get, writable } from 'svelte/store';
 import {
-  internalsSymbol,
   createMarkerIds,
   fitView as fitViewUtil,
   getElementsToRemove,
@@ -15,7 +14,6 @@ import {
   type XYPosition,
   type CoordinateExtent,
   type UpdateConnection,
-  type NodeDragItem,
   errorMessages
 } from '@xyflow/system';
 
diff --git a/packages/svelte/src/lib/store/initial-store.ts b/packages/svelte/src/lib/store/initial-store.ts
index 9c077ba0..525ee6b5 100644
--- a/packages/svelte/src/lib/store/initial-store.ts
+++ b/packages/svelte/src/lib/store/initial-store.ts
@@ -91,7 +91,9 @@ export const getInitialStore = ({
   let viewport: Viewport = { x: 0, y: 0, zoom: 1 };
 
   if (fitView && width && height) {
-    const nodesWithDimensions = nextNodes.filter((node) => node.width && node.height);
+    const nodesWithDimensions = nextNodes.filter(
+      (node) => (node.width && node.height) || (node.initialWidth && node.initialHeight)
+    );
     // @todo users nodeOrigin should be used here
     const bounds = getNodesBounds(nodesWithDimensions, { nodeOrigin: [0, 0] });
     viewport = getViewportForBounds(bounds, width, height, 0.5, 2, 0.1);
@@ -101,7 +103,7 @@ export const getInitialStore = ({
     flowId: writable<string | null>(null),
     nodes: createNodesStore(nextNodes, nodeLookup),
     nodeLookup: readable<NodeLookup<Node>>(nodeLookup),
-    edgeLookup: readable<EdgeLookup>(edgeLookup),
+    edgeLookup: readable<EdgeLookup<Edge>>(edgeLookup),
     visibleNodes: readable<Node[]>([]),
     edges: createEdgesStore(edges, connectionLookup, edgeLookup),
     visibleEdges: readable<EdgeLayouted[]>([]),
diff --git a/packages/system/src/types/nodes.ts b/packages/system/src/types/nodes.ts
index aadd4a47..4f6c130e 100644
--- a/packages/system/src/types/nodes.ts
+++ b/packages/system/src/types/nodes.ts
@@ -39,8 +39,10 @@ export type NodeBase<
   connectable?: boolean;
   deletable?: boolean;
   dragHandle?: string;
-  width?: number | null;
-  height?: number | null;
+  width?: number;
+  height?: number;
+  initialWidth?: number;
+  initialHeight?: number;
   /** Parent node id, used for creating sub-flows */
   parentNode?: string;
   zIndex?: number;
diff --git a/packages/system/src/utils/edges/positions.ts b/packages/system/src/utils/edges/positions.ts
index 8bb9f5df..55a157ea 100644
--- a/packages/system/src/utils/edges/positions.ts
+++ b/packages/system/src/utils/edges/positions.ts
@@ -4,6 +4,7 @@ import { NodeBase, NodeHandle } from '../../types/nodes';
 import { Position } from '../../types/utils';
 import { errorMessages, internalsSymbol } from '../../constants';
 import { HandleElement } from '../../types';
+import { getNodeDimensions } from '../general';
 
 export type GetEdgePositionParams = {
   id: string;
@@ -16,7 +17,10 @@ export type GetEdgePositionParams = {
 };
 
 function isNodeInitialized(node: NodeBase): boolean {
-  return !!(node?.[internalsSymbol]?.handleBounds || node?.handles?.length) && !!(node?.computed?.width || node?.width);
+  return (
+    !!(node?.[internalsSymbol]?.handleBounds || node?.handles?.length) &&
+    !!(node?.computed?.width || node?.width || node?.initialWidth)
+  );
 }
 
 export function getEdgePosition(params: GetEdgePositionParams): EdgePosition | null {
@@ -75,8 +79,8 @@ function toHandleBounds(handles?: NodeHandle[]) {
   const target = [];
 
   for (const handle of handles) {
-    handle.width = handle.width || 1;
-    handle.height = handle.height || 1;
+    handle.width = handle.width ?? 1;
+    handle.height = handle.height ?? 1;
 
     if (handle.type === 'source') {
       source.push(handle as HandleElement);
@@ -94,8 +98,7 @@ function toHandleBounds(handles?: NodeHandle[]) {
 function getHandlePosition(position: Position, node: NodeBase, handle: HandleElement | null = null): number[] {
   const x = (handle?.x ?? 0) + (node.computed?.positionAbsolute?.x ?? 0);
   const y = (handle?.y ?? 0) + (node.computed?.positionAbsolute?.y ?? 0);
-  const width = handle?.width || (node?.computed?.width ?? node?.width ?? 0);
-  const height = handle?.height || (node?.computed?.height ?? node?.height ?? 0);
+  const { width, height } = handle ?? getNodeDimensions(node);
 
   switch (position) {
     case Position.Top:
diff --git a/packages/system/src/utils/general.ts b/packages/system/src/utils/general.ts
index d6f95a1f..3a07e927 100644
--- a/packages/system/src/utils/general.ts
+++ b/packages/system/src/utils/general.ts
@@ -202,3 +202,19 @@ export const isMacOs = () => typeof navigator !== 'undefined' && navigator?.user
 export function isCoordinateExtent(extent?: CoordinateExtent | 'parent'): extent is CoordinateExtent {
   return extent !== undefined && extent !== 'parent';
 }
+
+export function getNodeDimensions<NodeType extends NodeBase = NodeBase>(
+  node: NodeType
+): { width: number; height: number } {
+  return {
+    width: node.computed?.width ?? node.width ?? node.initialWidth ?? 0,
+    height: node.computed?.height ?? node.height ?? node.initialHeight ?? 0,
+  };
+}
+
+export function nodeHasDimensions<NodeType extends NodeBase = NodeBase>(node: NodeType): boolean {
+  return (
+    (node.computed?.width ?? node.width ?? node.initialWidth) !== undefined &&
+    (node.computed?.height ?? node.height ?? node.initialHeight) !== undefined
+  );
+}
diff --git a/packages/system/src/utils/graph.ts b/packages/system/src/utils/graph.ts
index 6407d1a1..9f4342dc 100644
--- a/packages/system/src/utils/graph.ts
+++ b/packages/system/src/utils/graph.ts
@@ -9,6 +9,7 @@ import {
   pointToRendererPoint,
   getViewportForBounds,
   isCoordinateExtent,
+  getNodeDimensions,
 } from './general';
 import {
   type Transform,
@@ -116,8 +117,9 @@ export const getNodePositionWithOrigin = (
     };
   }
 
-  const offsetX = (node.computed?.width ?? node.width ?? 0) * nodeOrigin[0];
-  const offsetY = (node.computed?.height ?? node.height ?? 0) * nodeOrigin[1];
+  const { width, height } = getNodeDimensions(node);
+  const offsetX = width * nodeOrigin[0];
+  const offsetY = height * nodeOrigin[1];
 
   const position: XYPosition = {
     x: node.position.x - offsetX,
@@ -164,8 +166,7 @@ export const getNodesBounds = (
         currBox,
         rectToBox({
           ...nodePos[params.useRelativePosition ? 'position' : 'positionAbsolute'],
-          width: node.computed?.width ?? node.width ?? 0,
-          height: node.computed?.height ?? node.height ?? 0,
+          ...getNodeDimensions(node),
         })
       );
     },
@@ -192,8 +193,8 @@ export const getNodesInside = <NodeType extends NodeBase>(
 
   const visibleNodes = nodes.reduce<NodeType[]>((res, node) => {
     const { computed, selectable = true, hidden = false } = node;
-    const width = computed?.width ?? node.width ?? null;
-    const height = computed?.height ?? node.height ?? null;
+    const width = computed?.width ?? node.width ?? node.initialWidth ?? null;
+    const height = computed?.height ?? node.height ?? node.initialHeight ?? null;
 
     if ((excludeNonSelectableNodes && !selectable) || hidden) {
       return res;