Microbenchmarks for Custom Elements

No CE:
  1. element.property = value
  2. element.getAttribute(property)
  3. document.createElement("div")
  4. element.innerHTML = "<div></div>"
  5. div.cloneNode(true)

CE (without upgrading):
  1. document.createElement("x-foo")
  2. element.innerHTML = "<x-foo></x-foo>"
  3. element.innerHTML = "<div is='x-foo'></x-foo>"
  4. customElement.remove()

CE (with upgrading):