Since the `border: 0;` property is applied
to every checkbox, there is no need for a class.
This is also a good opportunity to use ternaries
for the `checked` attribute, instead of clumsy `if`.
The inline javascript used with the cancel buttons
was only used to change the location.
Instead of doing this, it's easier to wrap
the button in a tag.
This is related to #909.
jvoisin
Andrew DeMaria
Eugene E. Kashpureff Jr
Sindre Mehus