Add function script before render

[thuynt46]

I have a issue that I need to add a function script to load font before I render epub. I only find the way that using function addScript in Content and add script function in Header by using ifame.

But it not working before display page, and function script. How can I resolve this issue>

[thuynt46]

@johnfactotum do you have some solutions for this?

[thuynt46]

anyone here, pls