ClipboardItem data Promise<DOMString> support usage document

ClipboardAPI/clipboarditem-with-string-data.md

@@ -10,7 +10,7 @@ The feature is available in Chromium-based browsers in M132 or later behind the
 
 Here is an example of writing a ClipboardItem where text data is passed directly as string. 
 
-## Example
+## Example 1
 
 ```javascript
 async function writeToClipboard() {
@@ -31,4 +31,27 @@ async function writeToClipboard() {
     console.error(e.message);
   }
 }
+```
+
+Similarly, ClipboardItem data supports promise that resolves to string
+
+## Example 2
+
+```javascript
+async function writePromiseToClipboard() {
+  try {
+    const promise_text_string = Promise.resolve("Hello World");
+    const promise_html_string = Promise.resolve("<h1>Hello World</h1>");
+
+    const item = new ClipboardItem({
+      "text/plain": promise_text_string,
+      "text/html": promise_html_string
+    });
+
+    await navigator.clipboard.write([data]);
+    console.log('Data copied to clipboard');
+  } catch (e) {
+    console.error(e.message);
+  }
+}
 ```