class ImageBackground extends HTMLElement {
  createdCallback() {
    let src = this.hasAttribute('src') ? this.getAttribute('src') : '/static/images/user.png'
    let className = `img-bg ${this.hasAttribute('className') ? this.getAttribute('className') : ''}`
    let isLazy = this.getAttribute('lazy') !== false

    const slotContent = document.createElement('slot')
    slotContent.setAttribute('name', 'slot-content')

    const wrapper = document.createElement('div')
    wrapper.appendChild(slotContent)
    wrapper.style.backgroundImage = `url("${src}")`
    wrapper.style.backgroundSize = 'cover'
    wrapper.style.backgroundPosition = 'center'
    wrapper.style.height = '300px'
    wrapper.setAttribute('class', className)

    this.createShadowRoot().appendChild(wrapper)
  }
}

document.registerElement('img-bg', ImageBackground)

img-bg(src="/static/images/email.svg")
      p(slot="slot-content") cek