Question

Now I face a problem with defining image attribute height and width as I don’t know its dimension from the server. Then I think about assigning width/height to auto.

e.g.

img {
    height: auto;
    width: auto;
}

but I am concerning about rendering performance images without specific width/height. I would like front end developers here to help with this concern.

Answer 1

Hey now define your img width in 100%

as like this

<div class="imgtagcss">
<img src="xxx.jpg" >
</div>

Css

.imgtagcss{
width:xxx;
}
.imgtagcss img{
width:100%;
}