The image below is loaded with the following img
tag.
<img
class="srcset-demo-img"
alt=""
src="images/2000x1000.png"
srcset="
images/500x250.png 500w,
images/1000x500.png 1000w,
images/1500x750.png 1500w,
images/2000x1000.png 2000w,
images/3000x1500.png 3000w">
For best results Disable cache in your browser. In Google Chrome, see Disabling Chrome cache for website development
This code is on GitHub at https://github.com/salcode/srcset-demo