regl vertex attribute size dependency

index.js

var regl = require('regl')()

regl.clear({
  color: [0, 0, 0, 1],
  depth: 1
})

// In regl, draw operations are specified declaratively using. Each JSON
// command is a complete description of all state. This removes the need to
// .bind() things like buffers or shaders. All the boilerplate of setting up
// and tearing down state is automated.
regl({

  // In a draw call, we can pass the shader source code to regl
  frag: `
  precision mediump float;
  uniform vec4 color;
  void main () {
    gl_FragColor = color;
  }`,

  vert: `
  precision mediump float;
  attribute vec2 position;
  void main () {
    gl_Position = vec4(position.xy, 0.0, 1.0);
  }`,

  attributes: {
    position: regl.buffer({
      size: 2,
      data: [
        [-1, 0],
        [0, -1],
        [1, 1]
      ]
    })
  },

  uniforms: {
    color: [1, 0, 0, 1]
  },

  count: 3
})()