Returns a CSS selector that matches the given element as good as possible.
To build the selector, the following element properties are used in decreasing
order of priority:
- The element's
[up-id] attribute
- The element's
[id] attribute
- The element's
[name] attribute
- The element's
[class] names
- The element's
[aria-label] attribute
- The element's tag name
Example
element = document.createElement('span')
element.className = 'klass'
selector = up.element.toSelector(element) // returns '.klass'
