Core htmx Shadow DOM Tests

• 400 content can be swapped if configured to do so9ms ‣

  var handler = htmx.on('htmx:beforeSwap', function(event) {
    if (event.detail.xhr.status === 400) {
      event.detail.shouldSwap = true
    }
  })
  this.server.respondWith('GET', '/test', function(xhr) {
    xhr.respond(400, {}, 'Clicked!')
  })
  var btn = make('<button hx-get="/test">Click Me!</button>')
  btn.click()
  this.server.respond()
  btn.innerText.should.equal('Clicked!')
  htmx.off('htmx:beforeSwap', handler)