Is `_Float16` supported by Emscripten?

I tried to compile code from my simulation that uses `_Float16` under the latest version of Emscripten, but I got this compiler error:

```
Particles.cpp:495:9: error: _Float16 is not supported on this target
495 | _Float16 f16test = 100.f16;
| ^
Particles.cpp:495:31: error: invalid suffix 'f16' on floating constant
495 | _Float16 f16test = 100.f16;
| ^
```

I can compile the same code under Windows x64 and Linux x64 with both GCC and Clang. Is `_Float16` not supported at all by Emscripten, or is there a flag to enable support? (hardware support, ideally)

Thanks!