Creates an element from the given HTML fragment string.
Use up.hello()
to activate JavaScript behavior within the created element.
element = up.element.createFromHTML('<div class="foo"><span>text</span></div>')
element.className // returns 'foo'
element.children[0] // returns <span> element
element.children[0].textContent // returns 'text'
A string of HTML from which to create the element.
The given HTML must have a single tag at its root or an error is thrown.