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Why is that? Running it with "3" (as the tutorial does) does actually work, but renders only one triangle (the first three vertices). I do aim to render six vertices making up two triangles forming a square.
//Edit: having VertexAttribPointer at 3 and DrawArrays at 6 seems to work and makes sense now. I did not see the functions context and that it does not refer to the vertex count of the entire buffer but to the format thereof.