const load = async (url, accept = 'text/html') => {
const headers = { accept }
const response = await fetch(url, { headers })
return await response.text()
}
load('/playground', 'text/xml')
.then(r => document.querySelector('.text-xml').value = r)
load('/playground', 'text/plain')
.then(r => document.querySelector('.text-plain').value = r)
load('/playground', 'application/json')
.then(r => document.querySelector('.application-json').value = r)
load('/playground')
.then(r => document.querySelector('.text-html').value = r)