Start porting ColorSwatch.
Fix @register unit test.
Can set an initial property value on an element attribute.
ColorSwatch
Upgrade custom elements in an element class' template.
LabeledColorSwatch
LabeledColorSwatch can track changes to content.
contentChanged event
Clean up
QuetzalElement.create()
Clean up
ListElement
For now, hand-copy items into list-element demo.
Tweaks
.height and .width properties for LoremPixel element
Trying to track down element upgrade bug
Playing with new list element approach using :nth-child.
Starting on new list element class.
RepeatedList
MappedList