diff --git a/dlls/mshtml/htmlstyle.c b/dlls/mshtml/htmlstyle.c
index a199a3cbb8f..7c08a5e077a 100644
--- a/dlls/mshtml/htmlstyle.c
+++ b/dlls/mshtml/htmlstyle.c
@@ -63,6 +63,8 @@ static const WCHAR attrBorderStyle[] =
     {'b','o','r','d','e','r','-','s','t','y','l','e',0};
 static const WCHAR attrBorderTopStyle[] =
     {'b','o','r','d','e','r','-','t','o','p','-','s','t','y','l','e',0};
+static const WCHAR attrBorderTopWidth[] =
+    {'b','o','r','d','e','r','-','t','o','p','-','w','i','d','t','h',0};
 static const WCHAR attrBorderWidth[] =
     {'b','o','r','d','e','r','-','w','i','d','t','h',0};
 static const WCHAR attrColor[] =
@@ -134,6 +136,7 @@ static const struct{
     {attrBorderRightStyle,     DISPID_IHTMLSTYLE_BORDERRIGHTSTYLE},
     {attrBorderStyle,          DISPID_IHTMLSTYLE_BORDERSTYLE},
     {attrBorderTopStyle,       DISPID_IHTMLSTYLE_BORDERTOPSTYLE},
+    {attrBorderTopWidth,       DISPID_IHTMLSTYLE_BORDERTOPWIDTH},
     {attrBorderWidth,          DISPID_IHTMLSTYLE_BORDERWIDTH},
     {attrColor,                DISPID_IHTMLSTYLE_COLOR},
     {attrCursor,               DISPID_IHTMLSTYLE_CURSOR},
@@ -1517,15 +1520,17 @@ static HRESULT WINAPI HTMLStyle_get_borderWidth(IHTMLStyle *iface, BSTR *p)
 static HRESULT WINAPI HTMLStyle_put_borderTopWidth(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_BORDER_TOP_WIDTH, &v, 0);
 }
 
 static HRESULT WINAPI HTMLStyle_get_borderTopWidth(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_BORDER_TOP_WIDTH, p, 0);
 }
 
 static HRESULT WINAPI HTMLStyle_put_borderRightWidth(IHTMLStyle *iface, VARIANT v)
diff --git a/dlls/mshtml/htmlstyle.h b/dlls/mshtml/htmlstyle.h
index b5fa2306a08..92cfcbb8f16 100644
--- a/dlls/mshtml/htmlstyle.h
+++ b/dlls/mshtml/htmlstyle.h
@@ -49,6 +49,7 @@ typedef enum {
     STYLEID_BORDER_RIGHT_STYLE,
     STYLEID_BORDER_STYLE,
     STYLEID_BORDER_TOP_STYLE,
+    STYLEID_BORDER_TOP_WIDTH,
     STYLEID_BORDER_WIDTH,
     STYLEID_COLOR,
     STYLEID_CURSOR,
diff --git a/dlls/mshtml/tests/dom.c b/dlls/mshtml/tests/dom.c
index 50f55b18cdc..5aaec9942c2 100644
--- a/dlls/mshtml/tests/dom.c
+++ b/dlls/mshtml/tests/dom.c
@@ -3465,6 +3465,25 @@ static void test_default_style(IHTMLStyle *style)
 
     hres = IHTMLStyle_put_backgroundPositionY(style, vDefault);
     ok(hres == S_OK, "put_backgroundPositionY failed: %08x\n", hres);
+    VariantClear(&vDefault);
+
+     /* borderTopWidth */
+    hres = IHTMLStyle_get_borderTopWidth(style, &vDefault);
+    ok(hres == S_OK, "get_borderTopWidth: %08x\n", hres);
+
+    V_VT(&v) = VT_BSTR;
+    V_BSTR(&v) = a2bstr("10px");
+    hres = IHTMLStyle_put_borderTopWidth(style, v);
+    ok(hres == S_OK, "put_borderTopWidth: %08x\n", hres);
+    VariantClear(&v);
+
+    hres = IHTMLStyle_get_borderTopWidth(style, &v);
+    ok(hres == S_OK, "get_borderTopWidth: %08x\n", hres);
+    ok(!strcmp_wa(V_BSTR(&v), "10px"), "expected 10px = %s\n", dbgstr_w(V_BSTR(&v)));
+    VariantClear(&v);
+
+    hres = IHTMLStyle_put_borderTopWidth(style, vDefault);
+    ok(hres == S_OK, "put_borderTopWidth: %08x\n", hres);
     VariantClear(&vDefault);
 
     hres = IHTMLStyle_QueryInterface(style, &IID_IHTMLStyle2, (void**)&style2);