Better not. It already exists former QuickJS and QuickJS-NG, and parsing JS is a no light task by any means. Even Edbrowse https://github.com/cmb/edbrowse can grind down to a halt an n270 netbook becaus of some sites with JS (both with qjs and qjs-ng). So Dillo would be no better.
Also, legacy machines couldn't run it as fast as they could.
Also, legacy machines couldn't run it as fast as they could.