[html] Assign a class name to <img> tag instead of write it in css file?

I am curious to know, is it true that it is better to assign a class name to the <img> tag in the html file instead of writing it down directly into css file?

<div class="column">
   <img class="custom-style" alt="" />
   <img class="custom-style" alt="" />
   <img class="custom-style" alt="" />
</div>

instead of

.column img{/*styling for image here*/}

I need to know is there any differences between of these in terms of web performance?

UPDATE:

I'm sorry, supposely the question is multiple <img> tags inside the .column div and all the images are using the same styling.

Assigning a class name and applying a CSS style are two different things.

If you mean <img class="someclass">, and

.someclass {
  [cssrule]
}

, then there is no real performance difference between applying the css to the class, or to .column img

It's just more versatile if you give it a class name as the style you specify will only apply to that class name. But if you exactly know every .column img and want to style that in the same way, there's no reason why you can't use that selector.

The performance difference, if any, is negligible these days.

Its depend. If you have more than two images in .column but you only need some images to have css applied then its better to add class to image directly instead of doing .column img{/*styling for image here*/}

In performance aspect i thing apply class to image is better because by doing so css will not look for possible child image.

I think the Class on img tag is better when You use the same style in different structure on Your site. You have to decide when you write less line of CSS code and HTML is more readable.