WebGL2RenderingContext.getFragDataLocation()
 The WebGL2RenderingContext.getFragDataLocation() method of the WebGL 2 API returns the binding of color numbers to user-defined varying out variables. 
Syntax
GLint gl.getFragDataLocation(program, name);
Parameters
- program
-  A WebGLProgramto query.
- name
-  A DOMStringspecifying the name of the user-defined varying out variable.
Return value
 A GLint indicating the assigned color number binding, or -1 otherwise. 
Examples
// program is a linked WebGLProgram gl.getFragDataLocation(program, 'fragColor');
Specifications
| Specification | 
|---|
| WebGL 2.0 Specification (WebGL 2.0) # 3.7.7 | 
Browser compatibility
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
| getFragDataLocation | 56 | 79 | 51 | No | 43 | 15 | 58 | 58 | 51 | 43 | 15 | 7.0 | 
See also
- WebGLRenderingContext.createProgram()
- WebGLRenderingContext.deleteProgram()
- WebGLRenderingContext.isProgram()
- WebGLRenderingContext.linkProgram()
- WebGLRenderingContext.useProgram()
- WebGLRenderingContext.validateProgram()
- WebGLRenderingContext.getProgramParameter()
- WebGLRenderingContext.getProgramInfoLog()
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    https://developer.mozilla.org/en-US/docs/Web/API/WebGL2RenderingContext/getFragDataLocation