WebGL2RenderingContext: fenceSync() method
  The WebGL2RenderingContext.fenceSync() method of the WebGL 2 API creates a new
  WebGLSync object and inserts it into the GL command stream.
Syntax
js
fenceSync(condition, flags)
Parameters
- condition
- 
    A GLenumspecifying the condition that must be met to set the sync object's state to signaled. Must begl.SYNC_GPU_COMMANDS_COMPLETE.
- flags
- 
    A GLbitfieldspecifying a bitwise combination of flags controlling the behavior of the sync object. Must be0(exists for extensions only).
Return value
A WebGLSync object.
Examples
  gl must be a WebGL2RenderingContext. WebGLSync
  objects are not available in WebGL 1.
js
const sync = gl.fenceSync(gl.SYNC_GPU_COMMANDS_COMPLETE, 0);
Specifications
| Specification | 
|---|
| WebGL 2.0 Specification # 3.7.14 | 
Browser compatibility
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