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Test Info:

<style>
* { content-visibility: auto; }
</style>
<script>
document.addEventListener('DOMContentLoaded', () => {
document.documentElement.setAttribute('contenteditable', true)
let a = document.createElement('map')
let b = document.createElement('h1')
let c = document.createElement('kbd')
b.appendChild(c)
a.appendChild(b)
document.documentElement.appendChild(a)
let d = new Range()
let f = document.getSelection()
f.addRange(d)
d.setStart(c, 0)
f.addRange(d)
f.removeRange(d)
})
</script>