mshtml: Use variant_to_nsstr in IHTMLDOMNode3::put_textContent.

dlls/mshtml/htmlnode.c

@@ -1245,12 +1245,7 @@ static HRESULT WINAPI HTMLDOMNode3_put_textContent(IHTMLDOMNode3 *iface, VARIANT
 
     TRACE("(%p)->(%s)\n", This, debugstr_variant(&v));
 
-    if(V_VT(&v) != VT_BSTR) {
-        FIXME("unsupported argument %s\n", debugstr_variant(&v));
-        return E_NOTIMPL;
-    }
-
-    nsAString_Init(&nsstr, V_BSTR(&v));
+    variant_to_nsstr(&v, FALSE, &nsstr);
     nsres = nsIDOMNode_SetTextContent(This->nsnode, &nsstr);
     nsAString_Finish(&nsstr);
     if(NS_FAILED(nsres)) {

dlls/mshtml/tests/elements.js

@@ -77,6 +77,11 @@ function test_textContent() {
     ok(div.textContent === "", "div.textContent = " + div.textContent);
     ok(div.childNodes.length === 0, "div.childNodes.length = " + div.childNodes.length);
 
+    div.textContent = null;
+    ok(div.textContent === "", "div.textContent = " + div.textContent);
+    div.textContent = 11;
+    ok(div.textContent === "11", "div.textContent = " + div.textContent);
+
     ok(document.textContent === null, "document.textContent = " + document.textContent);
 
     next_test();