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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/getProgramInfoLog below:

WebGLRenderingContext: getProgramInfoLog() method - Web APIs

WebGLRenderingContext: getProgramInfoLog() method

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The WebGLRenderingContext.getProgramInfoLog returns the information log for the specified WebGLProgram object. It contains errors that occurred during failed linking or validation of WebGLProgram objects.

Syntax
getProgramInfoLog(program)
Parameters Return value

A string that contains diagnostic messages, warning messages, and other information about the last linking or validation operation. When a WebGLProgram object is initially created, its information log will be a string of length 0.

Examples Checking program errors
const program = gl.createProgram();

// Attach pre-existing shaders
gl.attachShader(program, vertexShader);
gl.attachShader(program, fragmentShader);

gl.linkProgram(program);

gl.getProgramInfoLog(program);
Specifications Browser compatibility See also

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