diff --git a/dlls/mshtml/htmlstyle.c b/dlls/mshtml/htmlstyle.c
index 96ab9a45b72..82d48690761 100644
--- a/dlls/mshtml/htmlstyle.c
+++ b/dlls/mshtml/htmlstyle.c
@@ -41,6 +41,8 @@ static const WCHAR attrBackgroundColor[] =
     {'b','a','c','k','g','r','o','u','n','d','-','c','o','l','o','r',0};
 static const WCHAR attrBackgroundImage[] =
     {'b','a','c','k','g','r','o','u','n','d','-','i','m','a','g','e',0};
+static const WCHAR attrBackgroundPositionX[] =
+    {'b','a','c','k','g','r','o','u','n','d','-','p','o','s','i','t','i','o','n','-','x',0};
 static const WCHAR attrBackgroundRepeat[] =
     {'b','a','c','k','g','r','o','u','n','d','-','r','e','p','e','a','t',0};
 static const WCHAR attrBorder[] =
@@ -119,6 +121,7 @@ static const struct{
     {attrBackground,           DISPID_IHTMLSTYLE_BACKGROUND},
     {attrBackgroundColor,      DISPID_IHTMLSTYLE_BACKGROUNDCOLOR},
     {attrBackgroundImage,      DISPID_IHTMLSTYLE_BACKGROUNDIMAGE},
+    {attrBackgroundPositionX,  DISPID_IHTMLSTYLE_BACKGROUNDPOSITIONX},
     {attrBackgroundRepeat,     DISPID_IHTMLSTYLE_BACKGROUNDREPEAT},
     {attrBorder,               DISPID_IHTMLSTYLE_BORDER},
     {attrBorderBottomStyle,    DISPID_IHTMLSTYLE_BORDERBOTTOMSTYLE},
@@ -874,15 +877,15 @@ static HRESULT WINAPI HTMLStyle_get_backgroundPosition(IHTMLStyle *iface, BSTR *
 static HRESULT WINAPI HTMLStyle_put_backgroundPositionX(IHTMLStyle *iface, VARIANT v)
 {
     HTMLStyle *This = HTMLSTYLE_THIS(iface);
-    FIXME("(%p)->(v%d)\n", This, V_VT(&v));
-    return E_NOTIMPL;
+    TRACE("(%p)->(v%d)\n", This, V_VT(&v));
+    return set_nsstyle_attr_var(This->nsstyle, STYLEID_BACKGROUND_POSITION_X, &v, 0);
 }
 
 static HRESULT WINAPI HTMLStyle_get_backgroundPositionX(IHTMLStyle *iface, VARIANT *p)
 {
     HTMLStyle *This = HTMLSTYLE_THIS(iface);
-    FIXME("(%p)->(%p)\n", This, p);
-    return E_NOTIMPL;
+    TRACE("(%p)->(%p)\n", This, p);
+    return get_nsstyle_attr_var(This->nsstyle, STYLEID_BACKGROUND_POSITION_X, p, 0);
 }
 
 static HRESULT WINAPI HTMLStyle_put_backgroundPositionY(IHTMLStyle *iface, VARIANT v)
diff --git a/dlls/mshtml/htmlstyle.h b/dlls/mshtml/htmlstyle.h
index a275c3ac4d1..407a4abdc48 100644
--- a/dlls/mshtml/htmlstyle.h
+++ b/dlls/mshtml/htmlstyle.h
@@ -38,6 +38,7 @@ typedef enum {
     STYLEID_BACKGROUND,
     STYLEID_BACKGROUND_COLOR,
     STYLEID_BACKGROUND_IMAGE,
+    STYLEID_BACKGROUND_POSITION_X,
     STYLEID_BACKGROUND_REPEAT,
     STYLEID_BORDER,
     STYLEID_BORDER_BOTTOM_STYLE,
diff --git a/dlls/mshtml/tests/dom.c b/dlls/mshtml/tests/dom.c
index f09a78b5079..2a6758531d5 100644
--- a/dlls/mshtml/tests/dom.c
+++ b/dlls/mshtml/tests/dom.c
@@ -3429,6 +3429,25 @@ static void test_default_style(IHTMLStyle *style)
     ok(hres == S_OK, "put_borderLeft failed: %08x\n", hres);
     SysFreeString(sDefault);
 
+    /* backgroundPositionX */
+    hres = IHTMLStyle_get_backgroundPositionX(style, &vDefault);
+    ok(hres == S_OK, "get_backgroundPositionX failed: %08x\n", hres);
+
+    V_VT(&v) = VT_BSTR;
+    V_BSTR(&v) = a2bstr("10px");
+    hres = IHTMLStyle_put_backgroundPositionX(style, v);
+    ok(hres == S_OK, "put_backgroundPositionX failed: %08x\n", hres);
+    VariantClear(&v);
+
+    hres = IHTMLStyle_get_backgroundPositionX(style, &v);
+    ok(hres == S_OK, "get_backgroundPositionX failed: %08x\n", hres);
+    ok(V_VT(&v) == VT_BSTR, "V_VT(v)=%d\n", V_VT(&v));
+    VariantClear(&v);
+
+    hres = IHTMLStyle_put_backgroundPositionX(style, vDefault);
+    ok(hres == S_OK, "put_backgroundPositionX failed: %08x\n", hres);
+    VariantClear(&vDefault);
+
     hres = IHTMLStyle_QueryInterface(style, &IID_IHTMLStyle2, (void**)&style2);
     ok(hres == S_OK, "Could not get IHTMLStyle2 iface: %08x\n", hres);
     if(SUCCEEDED(hres)) {