should toggle class properly w/ selector0ms ‣
var div = make("<div id='div1'></div>")
div.classList.contains('foo').should.equal(false)
htmx.toggleClass('#div1', 'foo')
div.classList.contains('foo').should.equal(true)
htmx.toggleClass('#div1', 'foo')
div.classList.contains('foo').should.equal(false)