@Override
  public boolean shouldHighlightErrorElement(@NotNull PsiErrorElement element) {
    PsiFile containingFile = element.getContainingFile();
    return containingFile.getLanguage() != XHTMLLanguage.INSTANCE ||
           !(InjectedLanguageManager.getInstance(containingFile.getProject()).getInjectionHost(containingFile) instanceof PsiComment) ||
           !element.getErrorDescription().contains("Multiple root tags");
  }
@Override
  public boolean shouldHighlightErrorElement(@NotNull PsiErrorElement element)