What is difference between width + length v.s width + height and % and pixel in <img>

Question

I saw that
<img src = link width = "50%" height = "50%"> is different from <img src = link width = "50%" height = "50%">

Answer 1

Here are my examples
https://code.sololearn.com/WM0P0ZAXp85K/?ref=app

Answer 2

BroFar many thanks

Answer 3

Welcome Nguyen Tan Thanh