mshtml: Added IHTMLElement::get_offsetWidth implementation.

dlls/mshtml/htmlelem.c

@@ -707,8 +707,27 @@ static HRESULT WINAPI HTMLElement_get_offsetTop(IHTMLElement *iface, long *p)
 static HRESULT WINAPI HTMLElement_get_offsetWidth(IHTMLElement *iface, long *p)
 {
     HTMLElement *This = HTMLELEM_THIS(iface);
-    FIXME("(%p)->(%p)\n", This, p);
-    return E_NOTIMPL;
+    nsIDOMNSHTMLElement *nselem;
+    PRInt32 offset = 0;
+    nsresult nsres;
+
+    TRACE("(%p)->(%p)\n", This, p);
+
+    nsres = nsIDOMHTMLElement_QueryInterface(This->nselem, &IID_nsIDOMNSHTMLElement, (void**)&nselem);
+    if(NS_FAILED(nsres)) {
+        ERR("Could not get nsIDOMNSHTMLElement: %08x\n", nsres);
+        return E_FAIL;
+    }
+
+    nsres = nsIDOMNSHTMLElement_GetOffsetWidth(nselem, &offset);
+    nsIDOMNSHTMLElement_Release(nselem);
+    if(NS_FAILED(nsres)) {
+        ERR("GetOffsetWidth failed: %08x\n", nsres);
+        return E_FAIL;
+    }
+
+    *p = offset;
+    return S_OK;
 }
 
 static HRESULT WINAPI HTMLElement_get_offsetHeight(IHTMLElement *iface, long *p)

dlls/mshtml/tests/dom.c

@@ -541,6 +541,9 @@ static void _test_elem_offset(unsigned line, IUnknown *unk)
     hres = IHTMLElement_get_offsetHeight(elem, &l);
     ok_(__FILE__,line) (hres == S_OK, "get_offsetHeight failed: %08x\n", hres);
 
+    hres = IHTMLElement_get_offsetWidth(elem, &l);
+    ok_(__FILE__,line) (hres == S_OK, "get_offsetWidth failed: %08x\n", hres);
+
     IHTMLElement_Release(elem);
 }