getBoxQuads-API - Transform a 3d point into 2D

Hello, maybe here someone can help me. I'm currently workin on a polyfill for the getBoxQuads API (see https://github.com/jogibear9988/getBoxQuadsPolyfill). My problem now is, it's working for 2D transforms, but not for 3d. Anyone here, who knows how a browser transforms 3d-points to the 2d view? On my sample page you see some wrongly calculated overlays: https://jogibear9988.github.io/getBoxQuadsPolyfill/ In the screenshots you see, chrome with my polyfill and the wrong overlays, firefox with a native working implementation. here I tried some things: https://github.com/jogibear9988/getBoxQuadsPolyfill/commit/856fd111f14a496b77f6b2e2633876efab48911b Someone a little bit more information? Also found a few specs: https://drafts.csswg.org/css-transforms-2/#3d-rendering-contexts but couldn't get it fixed atm
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