If you're creating a demo and want to ensure it looks great across multiple devices and resolutions, resizing your window to capture resolution at once for the same screen is essential.
When you capture, you'll get the original resolution as viewed in the browser, as well as
1280 * 800px
1440 * 900px
1680 * 1050px
It's important to note that using multiple resolutions may affect your demo. Occasionally, you may want to replace old content with new content or collaborate on templates with colleagues. It looks odd when you do that with a different browser size. So we recommend resizing your window that makes it seamless.