unify to a single README, add an ultra-simple custom element
example of the <content> tag
try to ignore *.dart.js files
conditional template with an if attribute
clarify that bind attribute is optional when using if attribute
example of an observable primitive
add observable list
add a comment
testing custom element with styles
example for CSS style of internal elements of custom element
example of a command-line app using observables
add another way to manually observe for changes in a command-line app
latest attempts
add a comment that an example is waiting for a bug
eliminate warnings