[html] Resize image proportionally with CSS?

I believe this is the easiest way to do it, also possible using through the inline style attribute within the <img> tag.

.scaled
{
  transform: scale(0.7); /* Equal to scaleX(0.7) scaleY(0.7) */
}

<img src="flower.png" class="scaled">

or

<img src="flower.png" style="transform: scale(0.7);">