review the text box in image shown what is the best way to put this in HTML code example

Example 1: picture tag how to set size for each of the pictures

<img src="image-small.png"
    srcset="image-small.png 320w, image-medium.png 800w, image-large.png 1200w"
    sizes="80vw"
    alt="Image description">

Example 2: how to carry text to the next line in a label in vb.net

put able.text = "this is a test" & vbnewline & "123"