What problem does this feature solve?

i try to use ssr resently. but i dont't know how to insert my css code to html template in server.js. maybe you guys can add this part at ssr guid site, like insert js code to html .

What does the proposed API look like?

maybe you guys can add this part at ssr guid site, like insert js code to html .

This is a usage question and not for the issue list.