Godot: MSAA does not work for GODOT v3.2.rc1.official ,GLES2, HTML export

[ssatguru]

Godot version:
Godot Engine v3.2.rc1.official
OpenGL ES 2.0 Renderer: GeForce GTX 1060 6GB/PCIe/SSE2

OS/device including version:
Windows 10 Home
Version 1809
OS build 17763.973

Issue description:
MSAA does not work in HTML5 export for a 3D GLES2 project .
I get lot of aliasing.
MSAA works when Played (F5) from IDE and works for Windows Desktop export

For now using the workaround mentioned here
https://godotengine.org/qa/54752/no-fxaa-support-in-3-1-1
Adding the FXAA.tscn to my scene, as mentioned there, provides anit-aliasing

Steps to reproduce:
Enable MSAA
Goto Project Settings->General->Rendering->Quality->Filters->Msaa
Select a Msaa setting - one of 2x, 4x, 8x or 16x
Export to HTML ,export to Windows Desktop,
run
HTML - no anti-aliasing
Windows - anit-aliasing

Also tried
Project Settings->General->Global->Msaa
NOTE: Here Msaa is repeated twice

Minimal reproduction project:

[clayjohn]

WebGL 1.0 doesn't support MSAA, so we can't implement it for WebGL builds.

This limitation should be documented somewhere to make it easier for users to discover.

[Calinou]

@clayjohn I remember seeing many WebGL 1.0 applications supporting MSAA. I'm not sure how they did it (is there an optional extension)? That said, my memory may be failing me here.

[clayjohn]

@Calinou they can support it on the backbuffer. There is a flag you can use to request it on context creation. But it is optional, and doesn't apply to any other Framebuffers.

Godot renders everything to a Framebuffer and then copies it directly to the back buffer. So it's not possible to get MSAA.

[ssatguru]

Does it make sense to provide FXAA support then? user can select MSAA or FXAA?

[Calinou]

@ssatguru It can already be provided using a shader like this one. We might add a built-in option in 4.0, but no guarantees.

[ssatguru]

Yes I am using that for now, but not having much expertise in shaders not sure how it works or its implications. Would be nice to have some "official" support.