diff --git a/dlls/mshtml/htmlstyle.c b/dlls/mshtml/htmlstyle.c
index f036077f642..f93800522b3 100644
--- a/dlls/mshtml/htmlstyle.c
+++ b/dlls/mshtml/htmlstyle.c
@@ -59,6 +59,8 @@ static const WCHAR attrBorderLeft[] =
     {'b','o','r','d','e','r','-','l','e','f','t',0};
 static const WCHAR attrBorderLeftStyle[] =
     {'b','o','r','d','e','r','-','l','e','f','t','-','s','t','y','l','e',0};
+static const WCHAR attrBorderLeftWidth[] =
+    {'b','o','r','d','e','r','-','l','e','f','t','-','w','i','d','t','h',0};
 static const WCHAR attrBorderRightStyle[] =
     {'b','o','r','d','e','r','-','r','i','g','h','t','-','s','t','y','l','e',0};
 static const WCHAR attrBorderRightWidth[] =
@@ -140,6 +142,7 @@ static const struct{
     {attrBorderColor,          DISPID_IHTMLSTYLE_BORDERCOLOR},
     {attrBorderLeft,           DISPID_IHTMLSTYLE_BORDERLEFT},
     {attrBorderLeftStyle,      DISPID_IHTMLSTYLE_BORDERLEFTSTYLE},
+    {attrBorderLeftWidth,      DISPID_IHTMLSTYLE_BORDERLEFTWIDTH},
     {attrBorderRightStyle,     DISPID_IHTMLSTYLE_BORDERRIGHTSTYLE},
     {attrBorderRightWidth,     DISPID_IHTMLSTYLE_BORDERRIGHTWIDTH},
     {attrBorderStyle,          DISPID_IHTMLSTYLE_BORDERSTYLE},
@@ -1574,15 +1577,15 @@ static HRESULT WINAPI HTMLStyle_get_borderBottomWidth(IHTMLStyle *iface, VARIANT
 static HRESULT WINAPI HTMLStyle_put_borderLeftWidth(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_LEFT_WIDTH, &v, 0);
 }
 
 static HRESULT WINAPI HTMLStyle_get_borderLeftWidth(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_LEFT_WIDTH, p, 0);
 }
 
 static HRESULT WINAPI HTMLStyle_put_borderStyle(IHTMLStyle *iface, BSTR v)
diff --git a/dlls/mshtml/htmlstyle.h b/dlls/mshtml/htmlstyle.h
index 307824e5c5d..beab44e5343 100644
--- a/dlls/mshtml/htmlstyle.h
+++ b/dlls/mshtml/htmlstyle.h
@@ -47,6 +47,7 @@ typedef enum {
     STYLEID_BORDER_COLOR,
     STYLEID_BORDER_LEFT,
     STYLEID_BORDER_LEFT_STYLE,
+    STYLEID_BORDER_LEFT_WIDTH,
     STYLEID_BORDER_RIGHT_STYLE,
     STYLEID_BORDER_RIGHT_WIDTH,
     STYLEID_BORDER_STYLE,
diff --git a/dlls/mshtml/tests/dom.c b/dlls/mshtml/tests/dom.c
index 50222ecfda2..798dcd2d5bd 100644
--- a/dlls/mshtml/tests/dom.c
+++ b/dlls/mshtml/tests/dom.c
@@ -3557,8 +3557,8 @@ static void test_default_style(IHTMLStyle *style)
 
     V_BSTR(&v) = NULL;
     hres = IHTMLStyle_get_borderLeftWidth(style, &v);
-    todo_wine ok(hres == S_OK, "get_borderLeftWidth failed: %08x\n", hres);
-    todo_wine ok(!strcmp_wa(V_BSTR(&v), "thick"), "str=%s\n", wine_dbgstr_w(V_BSTR(&v)));
+    ok(hres == S_OK, "get_borderLeftWidth failed: %08x\n", hres);
+    ok(!strcmp_wa(V_BSTR(&v), "thick"), "str=%s\n", wine_dbgstr_w(V_BSTR(&v)));
     VariantClear(&v);
 
     hres = IHTMLStyle_get_borderLeftStyle(style, &str);
@@ -3665,6 +3665,25 @@ static void test_default_style(IHTMLStyle *style)
     ok(hres == S_OK, "put_borderBottomWidth: %08x\n", hres);
     VariantClear(&vDefault);
 
+    /* borderLeftWidth */
+    hres = IHTMLStyle_get_borderLeftWidth(style, &vDefault);
+    ok(hres == S_OK, "get_borderLeftWidth: %08x\n", hres);
+
+    V_VT(&v) = VT_BSTR;
+    V_BSTR(&v) = a2bstr("10");
+    hres = IHTMLStyle_put_borderLeftWidth(style, v);
+    ok(hres == S_OK, "put_borderLeftWidth: %08x\n", hres);
+    VariantClear(&v);
+
+    hres = IHTMLStyle_get_borderLeftWidth(style, &v);
+    ok(hres == S_OK, "get_borderLeftWidth: %08x\n", hres);
+    ok(!strcmp_wa(V_BSTR(&v), "10px"), "expected 10px = %s\n", wine_dbgstr_w(V_BSTR(&v)));
+    VariantClear(&v);
+
+    hres = IHTMLStyle_put_borderLeftWidth(style, vDefault);
+    ok(hres == S_OK, "put_borderLeftWidth: %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)) {