5.29 How to change image size of svg for html generation?

I can’t find out why \includegraphics[scale=0.5]{pic.svg} does not work with tex4ht as it does with pdf. So to change the svg image size, simply edit the svg file with text editor, and change the first line that says something like width="500pt" height="500pt" to just with="250px" for example, and save the .svg file.