title: What is the preferred way to Scale up and down images in responsive web design for Mobile?
body: <p>What is the preferred way to Scale up and down images in responsive web design?</p>
  
  <p>Different image for different screen size is better or should we scale the same image up and down?</p>
  
  <p>Which option is best considering the performance of website?</p>
  
  <p>I need cross browser way to work on all latest and old mobile browsers.</p>