Question

we can change the height and of the window as per our requirements​

Answer 1

Answer:

noooo u can't change.....

Answer 2

Answer:

advocates have often advised to add dimensions to your images for best performance to allow the page to be laid out with the appropriate space for the image, before the image itself has been downloaded. This avoids a layout shift as the image is downloaded — something Chrome has recently started measuring in the new Cumulative Layout Shift metric.