Seeking explaination on how to use html to make an image circle

Answer 1

You want to make an image of a circle? Use GIMP. That has nothing to do with HTML.
If not, what else are you asking?
Do you have an image and want to show it in HTML?
Do you want to make a circle in SVG and embed that in HTML?
Do you want to make an HTML element have completely rounded corners to be shaped like a circle?

Answer 2

Med Amine Fh Nice, however there is an error in your css.
Instead of
border-radius=50%;
It should be
border-radius: 50%;

Answer 3

in css :
img{
border-radius:50%;
width:100px;
height:auto;
}

Answer 4

Chris C. my fault .
Thanks for checking