files/en-us/web/api/gpucompilationmessage/offset/index.md
{{APIRef("WebGPU API")}}{{SecureContext_Header}}{{AvailableInWorkers}}
The offset read-only property of the
{{domxref("GPUCompilationMessage")}} interface is a number representing the offset from the start of the shader code to the exact point, or the start of the relevant substring, that the message corresponds to.
A number.
To be precise, offset is the number of {{glossary("UTF-16", "UTF-16 code units")}} from the beginning of the shader code to the exact point or start of the relevant substring that the message corresponds to.
If the message does not correspond to a specific code position (perhaps it refers to the whole of the shader code), offset will be 0.
const shaderModule = device.createShaderModule({
code: shaders,
});
const shaderInfo = await shaderModule.getCompilationInfo();
const firstMessage = shaderInfo.messages[0];
console.log(firstMessage.offset);
See the main GPUCompilationInfo page for a more detailed example.
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