Favicon setter

favicon.js

const set = favicon()
set('🐝')

//

function favicon() {
  const link = document.createElement('link')
  link.rel = 'icon'

  document.head.appendChild(link)

  const canvas = document.createElement('canvas')
  canvas.width = canvas.height = 32

  const ctx = canvas.getContext('2d')
  ctx.textAlign = 'center'
  ctx.textBaseline = 'middle'
  ctx.font = '26px serif'

  return function (emoji) {
    ctx.clearRect(0, 0, 32, 32)
    ctx.fillText(emoji, 16, 16)
    link.href = canvas.toDataURL()
  }
}