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After calling the SDL_Delay(), the window bar is hidden and a white bar is shown instead. 
I'm not sure if this is a feature or bug. Or I missed something? 

Thank you! 

Here is my code: 

#include <stdio.h> 
#include <stdlib.h> 
#include <stdbool.h> 
#include <SDL2/SDL.h> 

const int SCREEN_WIDTH = 640; 
const int SCREEN_HEIGHT = 480; 

int main(int argc, const char *argv[]) 
{ 
  if( SDL_Init( SDL_INIT_VIDEO ) < 0 ) 
  { 
    printf( "SDL could not initialize! SDL_Error: %s\n", SDL_GetError() ); 
  } 
  bool quit = false; 
  SDL_Event event; 
  SDL_Window* window = NULL; 
  window = SDL_CreateWindow("Test SDL", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN); 
  SDL_Renderer * renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED); 

  SDL_SetRenderDrawColor(renderer, 255, 254, 255, 255 ); 
  SDL_RenderClear(renderer); 

  SDL_RenderPresent(renderer); 
  SDL_Delay(5000); // window bar is hidden, a white blank bar is shown instead. 

  while (!quit) // window bar is shown right now. 
  { 
    SDL_WaitEvent(&event); 
    switch (event.type) 
    { 
      case SDL_QUIT: 
        quit = true; 
        break; 
    } 
  } 


  SDL_DestroyRenderer(renderer); 
  SDL_DestroyWindow(window); 

   SDL_Quit(); 
  return 0; 
}