public ItemCheckResult CheckItem(ParseItem item, ICssCheckerContext context) { if (!WESettings.Instance.Css.ValidateVendorSpecifics) { return(ItemCheckResult.Continue); } Declaration dec = (Declaration)item; if (!dec.IsValid || dec.IsVendorSpecific() || IgnoreProperty(dec) || context == null) { return(ItemCheckResult.Continue); } ICssSchemaInstance schema = CssEditorChecker.GetSchemaForItem(context, item); var missingEntries = dec.GetMissingVendorSpecifics(schema); if (missingEntries.ToArray().Length > 0) { var missingPrefixes = missingEntries.Select(e => e.Substring(0, e.IndexOf('-', 1) + 1)); string error = string.Format(CultureInfo.InvariantCulture, Resources.BestPracticeAddMissingVendorSpecific, dec.PropertyName.Text, string.Join(", ", missingPrefixes)); ICssError tag = new SimpleErrorTag(dec.PropertyName, error); context.AddError(tag); return(ItemCheckResult.CancelCurrentItem); } return(ItemCheckResult.Continue); }