mshtml: Implement IHTMLStyle_put_textDecorationLineThrough.

dlls/mshtml/htmlstyle.c

@@ -955,8 +955,10 @@ static HRESULT WINAPI HTMLStyle_get_textDecorationOverline(IHTMLStyle *iface, VA
 static HRESULT WINAPI HTMLStyle_put_textDecorationLineThrough(IHTMLStyle *iface, VARIANT_BOOL v)
 {
     HTMLStyle *This = HTMLSTYLE_THIS(iface);
-    FIXME("(%p)->(%x)\n", This, v);
-    return E_NOTIMPL;
+
+    TRACE("(%p)->(%x)\n", This, v);
+
+    return set_style_attr(This, STYLEID_TEXT_DECORATION, v ? valLineThrough : emptyW, 0);
 }
 
 static HRESULT WINAPI HTMLStyle_get_textDecorationLineThrough(IHTMLStyle *iface, VARIANT_BOOL *p)

dlls/mshtml/tests/dom.c

@@ -2566,6 +2566,17 @@ static void test_default_style(IHTMLStyle *style)
     ok(hres == S_OK, "get_textDecorationLineThrough failed: %08x\n", hres);
     ok(b == VARIANT_FALSE, "textDecorationLineThrough = %x\n", b);
 
+    hres = IHTMLStyle_put_textDecorationLineThrough(style, VARIANT_TRUE);
+    ok(hres == S_OK, "get_textDecorationLineThrough failed: %08x\n", hres);
+    ok(b == VARIANT_FALSE, "textDecorationLineThrough = %x\n", b);
+
+    hres = IHTMLStyle_get_textDecorationLineThrough(style, &b);
+    ok(hres == S_OK, "get_textDecorationLineThrough failed: %08x\n", hres);
+    ok(b == VARIANT_TRUE, "textDecorationLineThrough = %x\n", b);
+
+    hres = IHTMLStyle_put_textDecorationLineThrough(style, VARIANT_FALSE);
+    ok(hres == S_OK, "get_textDecorationLineThrough failed: %08x\n", hres);
+
     hres = IHTMLStyle_get_posWidth(style, NULL);
     ok(hres == E_POINTER, "get_posWidth failed: %08x\n", hres);