Do we need PVR/ETC texture for WebGL on mobile?

Now for my understanding, the WebGL is a standard protocol for browser to access graphic API directly. Although Unity says they do not support WebGL on mobile officially, it does can run somehow on powerful mobile with browser which supports WebGL.
My Question here is shouldn't we use platform specific texture format such as PVRTC for iOS or ETC1/2 for Android rather than the general DTX format to make the web run more efficient on mobile? Or there's some thing wrong in my acknowledgement. Could some one tell me about it?

 

We do: https://forum.unity.com/threads/sup...ed-texture-formats-etc2-pvr-for-webgl.502382/

 

Thanks man! So now what we do is waiting...
I've build a static scene with about 20k verts in webgl, and the performance is SOOOO POOR on iPhone, I'm wondering if it's because of the texture format or just me rendering too much

 

Yeah I know that. There's an odd thing, as I turn the phone from landscape to portrait, the fps goes up above 25 while it's lower than 5 in landscape. At first, I though it's canvas-size related, and started to reply this thread. But before I've finish the reply, it became 5 fps again and never goes back.

 

This would unblock product requirements for my company too. YES!

 

Why not support pvrtc on iOS and etc1 on android for WebGL? Obviously, current formats are wasting time and space.