Width in % is width of screen or width of Image?

Question

if we use width="100%" then it will show image with its original width or 100%width of browser page?

Answer 1

browser page,
for original width you can do width:auto; in your css

Answer 2

100% of Browser page

Answer 3

if we use width in the tag of img as <img width=300> it display the width of image.