I'm afraid we still don't know what you're talking about.
https://www.construct.net/en/forum/construct-3/general-discussion-7/c3-non-canvas-layers-127552
Newt, the forum pro as always. And I take it the answer is still no. Sad days.
That was Construct 2's greatest failure. No one likes having to modify the root HTML page that hosts the c2runtime.